CVE-2026-91800

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-23. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: <0.1%CVSS: 8.8Exploit: 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 local privilege escalation vulnerability exists in the installer of Foxit PDF Editor for macOS due to insufficient validation of a user-modifiable configuration value during high-privilege upgrades. A local attacker could exploit this issue to execute arbitrary commands with root privileges.

CVSS v3
8.8
EG Score
8.8HIGHhigh confidence
EG Risk
40
EG Risk 40/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
<0.1%
EPSS %ILE
below the 1st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 23, 2026

Last Modified

September 23, 2026

Advisory Details (1)

Auto-updated Sep 23, 2026
No patch confirmed yet.
generic

Security Bulletins | Foxit

https://www.foxit.com/support/security-bulletins.html

Vendor Advisories for CVE-2026-91800(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 22× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-10-04 04:19 UTCGHSA enrichment
  2. 2026-10-03 17:30 UTCGHSA enrichment
  3. 2026-10-03 06:41 UTCGHSA enrichment
  4. 2026-10-02 19:52 UTCEG score recompute
  5. 2026-10-02 19:52 UTCGHSA enrichment
  6. 2026-10-02 09:02 UTCGHSA enrichment
  7. 2026-10-01 22:12 UTCEG score recompute
  8. 2026-10-01 22:12 UTCGHSA enrichment
  9. 2026-10-01 19:51 UTCEPSS rescore
  10. 2026-10-01 11:15 UTCGHSA enrichment
  11. 2026-10-01 00:26 UTCEG score recompute
  12. 2026-10-01 00:25 UTCGHSA enrichment
  13. 2026-09-30 15:04 UTCEPSS rescore
  14. 2026-09-30 13:32 UTCGHSA enrichment
  15. 2026-09-30 02:42 UTCGHSA enrichment
  16. 2026-09-29 15:53 UTCEG score recompute
  17. 2026-09-29 15:53 UTCGHSA enrichment
  18. 2026-09-29 05:04 UTCEG score recompute
  19. 2026-09-29 05:04 UTCGHSA enrichment
  20. 2026-09-28 18:15 UTCGHSA enrichment
  21. 2026-09-28 07:01 UTCGHSA enrichment
  22. 2026-09-27 20:10 UTCGHSA enrichment
  23. 2026-09-27 09:21 UTCGHSA enrichment
  24. 2026-09-26 22:31 UTCEG score recompute
  25. 2026-09-26 22:31 UTCGHSA enrichment
Show 19 more
  1. 2026-09-26 15:59 UTCEPSS rescore
  2. 2026-09-26 11:34 UTCGHSA enrichment
  3. 2026-09-26 00:44 UTCGHSA enrichment
  4. 2026-09-25 13:24 UTCGHSA enrichment
  5. 2026-09-25 02:29 UTCGHSA enrichment
  6. 2026-09-24 15:39 UTCEG score recompute
  7. 2026-09-24 15:39 UTCGHSA enrichment
  8. 2026-09-24 14:04 UTCEPSS rescore
  9. 2026-09-24 04:50 UTCGHSA enrichment
  10. 2026-09-23 18:01 UTCEG score recompute
  11. 2026-09-23 18:00 UTCGHSA enrichment
  12. 2026-09-23 17:54 UTCEPSS rescore
  13. 2026-09-23 15:19 UTCEG score recompute
  14. 2026-09-23 15:19 UTCGHSA enrichment
  15. 2026-09-23 14:55 UTCEG score recompute
  16. 2026-09-23 14:54 UTCGHSA enrichment
  17. 2026-09-23 08:23 UTCEG score recompute
  18. 2026-09-23 07:57 UTCEG score recompute
  19. 2026-09-23 07:56 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-91800?
CVE-2026-91800 is a high vulnerability published on September 23, 2026. A local privilege escalation vulnerability exists in the installer of Foxit PDF Editor for macOS due to insufficient validation of a user-modifiable configuration value during high-privilege upgrades. A local attacker could exploit this issue to execute arbitrary commands with root privileges.
When was CVE-2026-91800 disclosed?
CVE-2026-91800 was first published on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91800 actively exploited?
CVE-2026-91800 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-2026-91800?
CVE-2026-91800 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-91800?
No fix for CVE-2026-91800 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-2026-91800 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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