CVE-2026-9699 — 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 o…
Published: 2026-06-26 · CVSS: 6.8 · CVSS 3.1
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7