CVE-2026-93643

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-25. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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

When OnlyOffice/Document Editing is available, an unauthenticated remote attacker with access to an existing supported public Briefcase document can abuse unsigned save fields to perform path-traversal writes and execute commands as zimbra.

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
59
EG Risk 59/100CISA 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend 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 at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
1.0%
EPSS %ILE
60th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend 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 at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (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 25, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Sep 29, 2026
No patch confirmed yet.
generic

Zimbra Security Advisories - Zimbra :: Tech Center

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

Vendor Advisories for CVE-2026-93643(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 52× in last 7d / 75× 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 13:52 UTCGHSA enrichment
  2. 2026-10-04 09:31 UTCGHSA enrichment
  3. 2026-10-04 05:08 UTCGHSA enrichment
  4. 2026-10-04 00:46 UTCGHSA enrichment
  5. 2026-10-03 20:25 UTCGHSA enrichment
  6. 2026-10-03 16:03 UTCEG score recompute
  7. 2026-10-03 16:03 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-03 11:41 UTCGHSA enrichment
  10. 2026-10-03 06:47 UTCGHSA enrichment
  11. 2026-10-03 02:24 UTCGHSA enrichment
  12. 2026-10-02 21:59 UTCEG score recompute
  13. 2026-10-02 21:59 UTCGHSA enrichment
  14. 2026-10-02 17:37 UTCGHSA enrichment
  15. 2026-10-02 13:15 UTCGHSA enrichment
  16. 2026-10-02 08:52 UTCGHSA enrichment
  17. 2026-10-02 04:27 UTCGHSA enrichment
  18. 2026-10-02 00:03 UTCEG score recompute
  19. 2026-10-02 00:03 UTCGHSA enrichment
  20. 2026-10-01 19:51 UTCEPSS rescore
  21. 2026-10-01 18:47 UTCGHSA enrichment
  22. 2026-10-01 14:24 UTCGHSA enrichment
  23. 2026-10-01 10:02 UTCGHSA enrichment
  24. 2026-10-01 05:40 UTCGHSA enrichment
  25. 2026-10-01 01:19 UTCGHSA enrichment
Show 50 more
  1. 2026-09-30 20:57 UTCGHSA enrichment
  2. 2026-09-30 16:35 UTCEG score recompute
  3. 2026-09-30 16:35 UTCGHSA enrichment
  4. 2026-09-30 15:04 UTCEPSS rescore
  5. 2026-09-30 11:23 UTCGHSA enrichment
  6. 2026-09-30 07:01 UTCGHSA enrichment
  7. 2026-09-30 02:39 UTCGHSA enrichment
  8. 2026-09-29 22:17 UTCGHSA enrichment
  9. 2026-09-29 19:42 UTCEG score recompute
  10. 2026-09-29 19:42 UTCGHSA enrichment
  11. 2026-09-29 15:20 UTCGHSA enrichment
  12. 2026-09-29 10:58 UTCGHSA enrichment
  13. 2026-09-29 06:37 UTCGHSA enrichment
  14. 2026-09-29 02:15 UTCGHSA enrichment
  15. 2026-09-28 21:53 UTCEG score recompute
  16. 2026-09-28 21:53 UTCGHSA enrichment
  17. 2026-09-28 17:31 UTCEG score recompute
  18. 2026-09-28 17:31 UTCGHSA enrichment
  19. 2026-09-28 13:52 UTCEPSS rescore
  20. 2026-09-28 13:52 UTCEPSS rescore
  21. 2026-09-28 13:08 UTCGHSA enrichment
  22. 2026-09-28 08:46 UTCGHSA enrichment
  23. 2026-09-28 04:25 UTCGHSA enrichment
  24. 2026-09-28 00:03 UTCGHSA enrichment
  25. 2026-09-27 19:41 UTCGHSA enrichment
  26. 2026-09-27 15:20 UTCEG score recompute
  27. 2026-09-27 15:20 UTCGHSA enrichment
  28. 2026-09-27 13:49 UTCEPSS rescore
  29. 2026-09-27 10:57 UTCGHSA enrichment
  30. 2026-09-27 06:35 UTCGHSA enrichment
  31. 2026-09-27 02:13 UTCGHSA enrichment
  32. 2026-09-26 21:51 UTCGHSA enrichment
  33. 2026-09-26 17:30 UTCEG score recompute
  34. 2026-09-26 17:30 UTCGHSA enrichment
  35. 2026-09-26 15:59 UTCEPSS rescore
  36. 2026-09-26 13:08 UTCGHSA enrichment
  37. 2026-09-26 08:44 UTCGHSA enrichment
  38. 2026-09-26 04:22 UTCEG score recompute
  39. 2026-09-26 04:22 UTCGHSA enrichment
  40. 2026-09-26 04:06 UTCEG score recompute
  41. 2026-09-26 04:05 UTCGHSA enrichment
  42. 2026-09-26 02:37 UTCGHSA enrichment
  43. 2026-09-25 22:12 UTCGHSA enrichment
  44. 2026-09-25 17:44 UTCEG score recompute
  45. 2026-09-25 17:44 UTCGHSA enrichment
  46. 2026-09-25 16:24 UTCEG score recompute
  47. 2026-09-25 16:24 UTCGHSA enrichment
  48. 2026-09-25 14:22 UTCEG score recompute
  49. 2026-09-25 14:06 UTCEG score recompute
  50. 2026-09-25 14:04 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-93643?
CVE-2026-93643 is a critical vulnerability published on September 25, 2026. When OnlyOffice/Document Editing is available, an unauthenticated remote attacker with access to an existing supported public Briefcase document can abuse unsigned save fields to perform path-traversal writes and execute commands as zimbra.
When was CVE-2026-93643 disclosed?
CVE-2026-93643 was first published on September 25, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-93643 actively exploited?
CVE-2026-93643 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (60th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-93643?
CVE-2026-93643 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-93643?
No fix for CVE-2026-93643 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-2026-93643 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-93643

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