CVE-2026-9699

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreHIGH confidence

Score 6.8 from GitHub Security Advisory published 2026-06-26. a secondary CVSS source baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.8Exploit: NoneExposed: 0

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

Mattermost Plugins versions <=11.6 10.18.11 11.3.6 11.6.5.0 fail to sanitize error responses from the OpenAI API before logging, which allows a user with access to server logs or support packets to obtain a valid or partially reconstructable OpenAI API key via inspection of mattermost.log entries generated during authentication failures. Mattermost Advisory ID: MMSA-2026-00609

CVSS v3
6.8
EG Score
6.8(high)
EPSS
24.4%
KEV
Not listed

Published

June 26, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 26, 2026
No patch confirmed yet.
generic

Security Updates

https://mattermost.com/security-updates

Vendor Advisories for CVE-2026-9699(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 20× in last 7d / 32× 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. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 15:28 UTCEG score recompute
  3. 2026-07-06 15:28 UTCGHSA enrichment
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 17:39 UTCEG score recompute
  6. 2026-07-05 17:39 UTCGHSA enrichment
  7. 2026-07-05 02:31 UTCEPSS rescore
  8. 2026-07-04 19:51 UTCEG score recompute
  9. 2026-07-04 19:51 UTCGHSA enrichment
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-03 22:04 UTCEG score recompute
  12. 2026-07-03 22:03 UTCGHSA enrichment
  13. 2026-07-03 00:14 UTCEG score recompute
  14. 2026-07-03 00:14 UTCGHSA enrichment
  15. 2026-07-02 02:25 UTCEG score recompute
  16. 2026-07-02 02:25 UTCGHSA enrichment
  17. 2026-07-01 15:07 UTCEPSS rescore
  18. 2026-07-01 04:37 UTCEG score recompute
  19. 2026-07-01 04:37 UTCGHSA enrichment
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 06:49 UTCEG score recompute
  22. 2026-06-30 06:49 UTCGHSA enrichment
  23. 2026-06-29 09:00 UTCEG score recompute
  24. 2026-06-29 09:00 UTCGHSA enrichment
  25. 2026-06-28 14:07 UTCEPSS rescore
Show 7 more
  1. 2026-06-28 11:12 UTCEG score recompute
  2. 2026-06-28 11:12 UTCGHSA enrichment
  3. 2026-06-28 04:56 UTCEPSS rescore
  4. 2026-06-27 13:25 UTCEG score recompute
  5. 2026-06-27 13:25 UTCGHSA enrichment
  6. 2026-06-26 15:37 UTCEG score recompute
  7. 2026-06-26 15:37 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-9699?
CVE-2026-9699 is a medium vulnerability published on June 26, 2026. Mattermost Plugins versions <=11.6 10.18.11 11.3.6 11.6.5.0 fail to sanitize error responses from the OpenAI API before logging, which allows a user with access to server logs or support packets to obtain a valid or partially reconstructable OpenAI API key via inspection of mattermost.log entries…
When was CVE-2026-9699 disclosed?
CVE-2026-9699 was first published in the National Vulnerability Database on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9699 actively exploited?
CVE-2026-9699 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9699?
CVE-2026-9699 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-9699?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9699, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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