CVE-2026-91814

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: <0.1% (below the 1st percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 5.3 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-09-23) is not newer than that change (2026-10-29), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2026-85159 (ENISA EUVD) · GHSA-c9r7-69j9-jq5j (GitHub Security Advisories)Source: ENISA EUVD

5.5EG
EchelonGraph verdictMonitorNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: <0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

A signature validation vulnerability exists in Foxit PDF Editor/Reader’s handling of incrementally updated PDF documents. Changes to visible document content may not invalidate the existing signature, allowing attackers to alter signed content and potentially carry out content spoofing while the document continues to appear validly signed.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

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)
Severity55% × 45%
Impact severity (EG Severity): CVSS 5.5 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 every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.
EPSS PROB
<0.1%
EPSS %ILE
below the 1st
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 (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.

EG Severity
5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
<0.1% within 30 daysSource: FIRST EPSS. 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 every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.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 every mission impact level.

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (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 23, 2026

Last Modified

October 29, 2026

Advisory Details (1)

Auto-updated Sep 23, 2026
No fix on record yet.

Vendor Advisories for CVE-2026-91814(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 9× in last 7d / 53× 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.

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. 2 repeat rows among the latest 87 are merged into the row they repeat.

  1. 2026-10-31 16:33 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  2. 2026-10-30 16:35 UTCEPSS rescoreEPSS <0.1% · below the 1st percentile
  3. 2026-10-29 17:28 UTCEG score recompute▲ 0.20
  4. 2026-10-29 17:27 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  5. 2026-10-29 17:26 UTCNVD updateCVSS v3 → 5.5
  6. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  7. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  8. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  9. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  10. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  11. 2026-10-25 13:50 UTCEG score recompute
  12. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  13. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  14. 2026-10-23 09:35 UTCEG score recompute
  15. 2026-10-23 09:34 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  16. 2026-10-22 12:30 UTCEG score recompute
  17. 2026-10-22 12:30 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  18. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  19. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  20. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  21. 2026-10-18 03:00 UTCEG score recompute
  22. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  23. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
Show 60 more
  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-10-12 14:45 UTCEG score recompute
  4. 2026-10-11 19:13 UTCEG score recompute
  5. 2026-10-11 18:25 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  6. 2026-10-11 16:29 UTCEG score recompute
  7. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  8. 2026-10-11 13:44 UTCEG score recompute
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  10. 2026-10-10 17:38 UTCEG score recompute
  11. 2026-10-10 17:38 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  12. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  13. 2026-10-09 17:48 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  14. 2026-10-08 17:58 UTCEG score recompute
  15. 2026-10-08 17:58 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  16. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-10-07 18:08 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  19. 2026-10-06 18:17 UTCEG score recompute
  20. 2026-10-06 18:17 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  21. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  22. 2026-10-05 18:27 UTCEG score recompute
  23. 2026-10-05 18:27 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  24. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  26. 2026-10-04 18:38 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  27. 2026-10-03 18:40 UTCEG score recompute
  28. 2026-10-03 18:40 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  29. 2026-10-02 18:16 UTCEG score recompute
  30. 2026-10-02 18:16 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  31. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  32. 2026-10-01 18:24 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  33. 2026-09-30 18:14 UTCEG score recompute
  34. 2026-09-30 18:14 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  35. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  36. 2026-09-29 18:17 UTCEG score recompute
  37. 2026-09-29 18:17 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  38. 2026-09-28 18:15 UTCEG score recompute
  39. 2026-09-28 18:15 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  40. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  41. 2026-09-27 17:57 UTCEG score recompute
  42. 2026-09-27 17:57 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  43. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  44. 2026-09-26 18:08 UTCEG score recompute
  45. 2026-09-26 18:08 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  46. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  47. 2026-09-25 18:19 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  48. 2026-09-24 17:58 UTCEG score recompute
  49. 2026-09-24 17:58 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  50. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  51. 2026-09-23 18:01 UTCEG score recompute
  52. 2026-09-23 18:01 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  53. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  54. 2026-09-23 15:19 UTCEG score recompute
  55. 2026-09-23 15:19 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  56. 2026-09-23 14:40 UTCEG score recompute
  57. 2026-09-23 14:40 UTCGHSA enrichmentGHSA-c9r7-69j9-jq5j · GitHub CVSS 5.3
  58. 2026-09-23 08:23 UTCEG score recompute
  59. 2026-09-23 07:57 UTCEG score recomputeFirst assessed: 5.3 MEDIUM
  60. 2026-09-23 07:56 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-91814?
CVE-2026-91814 is a medium-severity vulnerability; its CVE record was published on September 23, 2026. A signature validation vulnerability exists in Foxit PDF Editor/Reader’s handling of incrementally updated PDF documents. Changes to visible document content may not invalidate the existing signature, allowing attackers to alter signed content and potentially carry out content spoofing while the…
When was the CVE record for CVE-2026-91814 published?
The CVE record for CVE-2026-91814 was published on September 23, 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 29, 2026; the record at its source may have been updated since.
Is CVE-2026-91814 actively exploited?
CVE-2026-91814 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a <0.1% probability of exploitation in the next 30 days (below the 1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-91814?
CVE-2026-91814 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-91814?
No fix for CVE-2026-91814 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-91814 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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