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CVE Vulnerability Details :
CVE-2026-9699
PUBLISHED
More InfoOfficial Page
Assigner-Mattermost
Assigner Org ID-9302f53e-dde5-4bf3-b2f2-a83f91ac0eee
View Known Exploited Vulnerability (KEV) details
Published At-26 Jun, 2026 | 14:43
Updated At-26 Jun, 2026 | 15:40
Rejected At-
▼CVE Numbering Authority (CNA)
Mattermost Agents plugin logs unsanitized OpenAI API keys on authentication errors

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

Affected Products
Vendor
Mattermost, Inc.Mattermost
Product
Mattermost
Default Status
unaffected
Versions
Affected
  • From 0 through 10.18.11 (semver)
  • From 0 through 11.3.6 (semver)
  • From 0 through 11.6.5 (semver)
Unaffected
  • 11.7.0
  • 10.11.19
  • 11.6.4
  • 11.5.7
Problem Types
TypeCWE IDDescription
CWECWE-532CWE-532: Insertion of Sensitive Information into Log Files
Type: CWE
CWE ID: CWE-532
Description: CWE-532: Insertion of Sensitive Information into Log Files
Metrics
VersionBase scoreBase severityVector
3.16.8MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Version: 3.1
Base score: 6.8
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Update Mattermost Plugins to versions 11.7.0, 10.11.19, 11.6.4, 11.5.7 or higher.

Configurations
Workarounds
Exploits
Credits
finder
Edgar Bellot Micó
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://mattermost.com/security-updates
vendor-advisory
Hyperlink: https://mattermost.com/security-updates
Resource:
vendor-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found