# CVE-2026-10819

## Summary

- **CVE ID:** CVE-2026-10819
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-409
- **Published:** Jul 27, 2026
- **Last Modified:** Jul 27, 2026

## Description

Mattermost versions 11.6.x <= 11.6.5, 10.11.x <= 10.11.20, 11.8.x <= 11.8.1, 11.7.x <= 11.7.4 fail to limit the number of frames and enforce the file size cap on animated GIF uploads, which allows an authenticated attacker to cause a denial of service via a crafted animated GIF uploaded as a custom emoji.. Mattermost Advisory ID: MMSA-2026-00695

## Affected Products

- Mattermost — Mattermost (11.6.0)
- Mattermost — Mattermost (10.11.0)
- Mattermost — Mattermost (11.8.0)
- Mattermost — Mattermost (11.7.0)
- Mattermost — Mattermost (11.9.0)
- Mattermost — Mattermost (11.6.6)
- Mattermost — Mattermost (10.11.21)
- Mattermost — Mattermost (11.8.2)
- Mattermost — Mattermost (11.7.5)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 15.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._