CVE-2026-92020

HIGHPre-NVD 8.88.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 4 sources updated this week

Also known asEUVD-2026-78483 (ENISA EUVD) · GHSA-rmcw-j32j-ffq6 (GitHub Security Advisories)Source: ENISA EUVD

8.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity88% × 45%
Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
17th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.8): severity, escalated by confirmed exploitation. This CVE's 8.8 is its impact severity (EG Severity), not escalated.

EG Severity
8.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 15, 2026

Last Modified

October 6, 2026

Advisory Details (5)

Auto-updated Sep 15, 2026
Patch available.
Web page

Security Vulnerabilities fixed in Firefox ESR 153.3 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-93/
Web page

Security Vulnerabilities fixed in Firefox ESR 140.16 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-92/
Web page

Security Vulnerabilities fixed in Firefox ESR 115.41 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-91/
Web page

Security Vulnerabilities fixed in Firefox 156 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-90/

Patch Availability(21)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatfirefox-0:140.16.0-1.el7_92026-10-15redhat
redhatfirefox-0:140.16.0-1.el8_82026-10-14redhat
redhatfirefox-0:140.16.0-1.el8_62026-10-14redhat
redhatfirefox-0:140.16.0-1.el10_02026-10-14redhat
redhatfirefox-0:140.16.0-1.el9_42026-10-14redhat
redhatfirefox-0:140.16.0-1.el9_62026-10-14redhat
redhatfirefox-0:140.16.0-1.el8_42026-10-14redhat
redhatfirefox-0:140.16.0-1.el9_22026-10-14redhat
redhatthunderbird-0:140.16.0-1.el8_42026-10-13redhat
redhatthunderbird-0:140.16.0-1.el9_62026-10-13redhat
redhatthunderbird-0:140.16.0-1.el8_62026-10-13redhat
redhatthunderbird-0:140.16.0-1.el8_82026-10-13redhat
redhatthunderbird-0:140.16.0-1.el9_42026-10-12redhat
redhatthunderbird-0:140.16.0-1.el9_22026-10-12redhat
redhatthunderbird-0:140.16.0-1.el10_02026-10-12redhat
redhatthunderbird-0:140.16.0-1.el8_102026-09-30redhat
redhatthunderbird-0:140.16.0-1.el10_22026-09-29redhat
redhatthunderbird-0:140.16.0-1.el9_82026-09-24redhat
redhatfirefox-0:140.16.0-1.el8_102026-09-24redhat
redhatfirefox-0:140.16.0-1.el10_22026-09-21redhat
redhatfirefox-0:140.16.0-1.el9_82026-09-21redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr102.11.0esr-1 ... 140.9.1esr-1~deb13u1 (201 versions)
  • every version up to 140.16.0esr-1~deb12u1: fixed in 140.16.0esr-1~deb12u1
—
thunderbird1:102.11.0-1 ... 1:140.9.1esr-1~deb13u1 (229 versions)
  • every version up to 1:140.16.0esr-1~deb12u1: fixed in 1:140.16.0esr-1~deb12u1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (77 versions)
  • every version up to 140.16.0esr-1~deb13u1: fixed in 140.16.0esr-1~deb13u1
—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (85 versions)
  • every version up to 1:140.16.0esr-1~deb13u1: fixed in 1:140.16.0esr-1~deb13u1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (78 versions)
  • every version up to 140.16.0esr-1: fixed in 140.16.0esr-1
—
thunderbird1:128.13.0esr-1 ... 1:153.2.0esr-1 (97 versions)
  • every version up to 1:153.3.0esr-1: fixed in 1:153.3.0esr-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 86× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 185 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 85 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  2. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  3. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  4. 2026-10-29 12:55 UTCEG score recompute
  5. 2026-10-29 12:55 UTCVendor advisory
  6. 2026-10-29 12:55 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  7. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  8. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  9. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  10. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  11. 2026-10-25 13:50 UTCEG score recompute
  12. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  13. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  14. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  15. 2026-10-22 13:14 UTCEG score recompute
  16. 2026-10-22 13:14 UTCVendor advisory
  17. 2026-10-22 13:13 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  18. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  19. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  20. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  21. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  22. 2026-10-18 03:00 UTCEG score recompute
  23. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  24. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  25. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
Show 75 more
  1. 2026-10-15 15:37 UTCEG score recompute
  2. 2026-10-15 15:37 UTCVendor advisory
  3. 2026-10-15 15:37 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  4. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  5. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  6. 2026-10-13 04:38 UTCEG score recompute
  7. 2026-10-13 04:38 UTCVendor advisory
  8. 2026-10-13 04:38 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  9. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  10. 2026-10-12 14:45 UTCEG score recompute
  11. 2026-10-11 19:34 UTCVendor advisory
  12. 2026-10-11 19:34 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  13. 2026-10-11 19:13 UTCEG score recompute
  14. 2026-10-11 16:29 UTCEG score recompute
  15. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  16. 2026-10-11 13:44 UTCEG score recompute
  17. 2026-10-11 05:44 UTCEG score recompute
  18. 2026-10-11 05:44 UTCVendor advisory
  19. 2026-10-11 05:44 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  20. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  21. 2026-10-10 15:54 UTCVendor advisory
  22. 2026-10-10 15:54 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  23. 2026-10-10 03:53 UTCEG score recompute
  24. 2026-10-10 03:53 UTCVendor advisory
  25. 2026-10-10 03:53 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  26. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  27. 2026-10-09 15:55 UTCVendor advisory
  28. 2026-10-09 15:54 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  29. 2026-10-08 22:41 UTCEG score recompute
  30. 2026-10-08 22:41 UTCVendor advisory
  31. 2026-10-08 22:41 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  32. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  33. 2026-10-08 02:44 UTCEG score recompute
  34. 2026-10-08 02:44 UTCVendor advisory
  35. 2026-10-08 02:44 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  36. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  37. 2026-10-07 14:47 UTCVendor advisory
  38. 2026-10-07 14:47 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  39. 2026-10-07 02:50 UTCEG score recompute
  40. 2026-10-07 02:50 UTCVendor advisory
  41. 2026-10-07 02:50 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  42. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  43. 2026-10-06 14:53 UTCVendor advisory
  44. 2026-10-06 14:53 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  45. 2026-10-06 10:16 UTCVendor advisory
  46. 2026-10-06 10:16 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  47. 2026-10-05 21:54 UTCEG score recompute
  48. 2026-10-05 21:54 UTCVendor advisory
  49. 2026-10-05 21:53 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  50. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  51. 2026-10-05 09:14 UTCEG score recompute
  52. 2026-10-05 09:14 UTCVendor advisory
  53. 2026-10-05 09:13 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  54. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  55. 2026-10-04 21:17 UTCVendor advisory
  56. 2026-10-04 21:17 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  57. 2026-10-04 09:20 UTCVendor advisory
  58. 2026-10-04 09:20 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  59. 2026-10-03 21:23 UTCEG score recompute
  60. 2026-10-03 21:23 UTCVendor advisory
  61. 2026-10-03 21:23 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  62. 2026-10-03 09:25 UTCVendor advisory
  63. 2026-10-03 09:25 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  64. 2026-10-02 20:47 UTCEG score recompute
  65. 2026-10-02 20:47 UTCVendor advisory
  66. 2026-10-02 20:47 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  67. 2026-10-02 08:12 UTCVendor advisory
  68. 2026-10-02 08:11 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  69. 2026-10-01 20:11 UTCEG score recompute
  70. 2026-10-01 20:11 UTCVendor advisory
  71. 2026-10-01 20:10 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  72. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  73. 2026-10-01 08:13 UTCVendor advisory
  74. 2026-10-01 08:13 UTCGHSA enrichmentGHSA-rmcw-j32j-ffq6 · GitHub severity HIGH · GitHub CVSS 8.8
  75. 2026-09-30 20:15 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-92020?
CVE-2026-92020 is a high-severity vulnerability; its CVE record was published on September 15, 2026. Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
When was the CVE record for CVE-2026-92020 published?
The CVE record for CVE-2026-92020 was published on September 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 6, 2026; the record at its source may have been updated since.
Is CVE-2026-92020 actively exploited?
CVE-2026-92020 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (17th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-92020?
CVE-2026-92020 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-92020?
A fix for CVE-2026-92020 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-92020 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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