# CVE-2026-9699

## Summary

- **CVE ID:** CVE-2026-9699
- **Severity:** MEDIUM
- **CVSS Score:** 6.8 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N)
- **CWE:** CWE-532
- **Published:** Jun 26, 2026
- **Last Modified:** Jun 26, 2026

## Description

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

- Mattermost — Mattermost (0)
- Mattermost — Mattermost (11.7.0)
- Mattermost — Mattermost (10.11.19)
- Mattermost — Mattermost (11.6.4)
- Mattermost — Mattermost (11.5.7)

## References

- [CNA](https://mattermost.com/security-updates)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.46%
- **EPSS Percentile:** 39.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._