CVE-2026-100720

HIGHPre-NVD 8.78.7
EchelonGraph scoreMEDIUM confidence

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

Score 8.7 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-26. A secondary CVSS source baseline 8.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-87693 (ENISA EUVD) · GHSA-mmqp-fgp4-5q7j (GitHub Security Advisories)Source: ENISA EUVD

8.7EG
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: 0.2%CVSS: 8.7Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

Froxlor 2.0.0 through 2.3.10 is vulnerable to stored cross-site scripting. When a customer (the lowest-privileged authenticated role) uploads an SSL certificate for one of their own domains, the Certificates API add()/update() methods parse it with openssl_x509_parse() and store the issuer organization (issuer['O']) value verbatim without sanitization. Froxlor's table-listing renderer then emits scalar cells through Twig's raw filter, disabling HTML auto-escaping, so when an administrator or reseller opens Domains > SSL certificates the attacker-supplied issuer value executes as script in the privileged user's session. This crosses a privilege boundary from customer to admin and can result in full administrator account takeover; because a Froxlor admin controls webserver, DNS, and PHP configuration applied by a cron job running as root, the issue can be further escalated to command execution as root on the managed server. The issue is fixed in Froxlor 2.3.12.

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
39
EG Risk 39/100

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)
Severity87% × 45%
Impact severity (EG Severity): CVSS 8.7 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 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: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
11th
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 (8.7): severity, escalated by confirmed exploitation. This CVE's 8.7 is its impact severity (EG Severity), not escalated.

EG Severity
8.7 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). 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).

The CVE record names the fixed release. 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 26, 2026

Last Modified

September 26, 2026

Advisory Details (2)

Auto-updated Sep 26, 2026
Fix named in the CVE record. Sources: github.
Web page

Froxlor before 2.3.12 Stored XSS via SSL certificate issuer | Advisories | VulnCheck

https://www.vulncheck.com/advisories/froxlor-before-2.3.12-stored-xss-via-ssl-certificate-issuer
GitHub advisoryMentions a patch (unverified)

Stored XSS via SSL certificate issuer enables customer-to-admin account takeover in Froxlor 2.x · Advisory · froxlor/froxlor · GitHub

https://github.com/froxlor/froxlor/security/advisories/GHSA-89vj-gqqr-73p8

Vendor Advisories for CVE-2026-100720(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 67× 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.

  1. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  2. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  4. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  5. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  6. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  7. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  8. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  9. 2026-10-26 15:32 UTCEG score recompute
  10. 2026-10-26 15:32 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  11. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  12. 2026-10-25 15:58 UTCEG score recompute
  13. 2026-10-25 05:39 UTCEG score recompute
  14. 2026-10-25 05:39 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  15. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  16. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  17. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  18. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  19. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  20. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  21. 2026-10-18 05:11 UTCEG score recompute
  22. 2026-10-17 20:08 UTCEG score recompute
  23. 2026-10-17 20:08 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  24. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  25. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.2% · 11th percentile
Show 72 more
  1. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  2. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  4. 2026-10-12 16:41 UTCEG score recompute
  5. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  6. 2026-10-12 01:17 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  7. 2026-10-11 20:16 UTCEG score recompute
  8. 2026-10-11 18:29 UTCEG score recompute
  9. 2026-10-11 15:02 UTCEG score recompute
  10. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  11. 2026-10-11 12:53 UTCEG score recompute
  12. 2026-10-11 12:53 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  13. 2026-10-11 00:39 UTCEG score recompute
  14. 2026-10-11 00:39 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  15. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  16. 2026-10-10 12:27 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  17. 2026-10-10 00:28 UTCEG score recompute
  18. 2026-10-10 00:27 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  19. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  20. 2026-10-09 12:27 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  21. 2026-10-09 00:27 UTCEG score recompute
  22. 2026-10-09 00:27 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  23. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  24. 2026-10-08 12:27 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  25. 2026-10-08 00:19 UTCEG score recompute
  26. 2026-10-08 00:19 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  27. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  28. 2026-10-07 12:19 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  29. 2026-10-07 00:20 UTCEG score recompute
  30. 2026-10-07 00:20 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  31. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  32. 2026-10-06 12:20 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  33. 2026-10-06 00:20 UTCEG score recompute
  34. 2026-10-06 00:20 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  35. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  36. 2026-10-05 12:18 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  37. 2026-10-05 00:18 UTCEG score recompute
  38. 2026-10-05 00:18 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  39. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  40. 2026-10-04 12:15 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  41. 2026-10-04 00:15 UTCEG score recompute
  42. 2026-10-04 00:15 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  43. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  44. 2026-10-03 12:16 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  45. 2026-10-03 00:16 UTCEG score recompute
  46. 2026-10-03 00:16 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  47. 2026-10-02 12:15 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  48. 2026-10-02 00:14 UTCEG score recompute
  49. 2026-10-02 00:14 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  50. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  51. 2026-10-01 12:14 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  52. 2026-10-01 00:15 UTCEG score recompute
  53. 2026-10-01 00:15 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  54. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  55. 2026-09-30 11:47 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  56. 2026-09-29 23:47 UTCEG score recompute
  57. 2026-09-29 23:47 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  58. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  59. 2026-09-29 11:23 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  60. 2026-09-28 23:21 UTCEG score recompute
  61. 2026-09-28 23:21 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  62. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  63. 2026-09-28 11:21 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  64. 2026-09-27 23:21 UTCEG score recompute
  65. 2026-09-27 23:21 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  66. 2026-09-27 11:21 UTCEG score recompute
  67. 2026-09-27 11:20 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  68. 2026-09-26 23:17 UTCEG score recompute
  69. 2026-09-26 23:17 UTCGHSA enrichmentGHSA-mmqp-fgp4-5q7j · GitHub severity CRITICAL · GitHub CVSS 8.7
  70. 2026-09-26 14:25 UTCEG score recompute
  71. 2026-09-26 13:33 UTCEG score recomputeFirst assessed: 8.7 HIGH
  72. 2026-09-26 13:30 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-100720?
CVE-2026-100720 is a high-severity vulnerability; its CVE record was published on September 26, 2026. Froxlor 2.0.0 through 2.3.10 is vulnerable to stored cross-site scripting. When a customer (the lowest-privileged authenticated role) uploads an SSL certificate for one of their own domains, the Certificates API add()/update() methods parse it with openssl_x509_parse() and store the issuer…
When was CVE-2026-100720 made public?
CVE-2026-100720 was made public on September 6, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on September 26, 2026. EchelonGraph's copy of the record carries a last-modified date of September 26, 2026; the record at its source may have been updated since.
Is CVE-2026-100720 actively exploited?
CVE-2026-100720 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100720?
CVE-2026-100720 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100720?
The CVE record for CVE-2026-100720 names the fix: "The issue is fixed in Froxlor 2.3.12." The vendor advisories EchelonGraph has for CVE-2026-100720 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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