# CVE-2026-4053

## Summary

- **CVE ID:** CVE-2026-4053
- **Severity:** LOW
- **CVSS Score:** 3.1 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N)
- **CWE:** CWE-672
- **Published:** May 15, 2026
- **Last Modified:** May 15, 2026

## Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce the PostEditTimeLimit on non-message post fields which allows an authenticated user to modify post file attachments, props, and pin status after the edit window has expired via the post patch and update API endpoints.. Mattermost Advisory ID: MMSA-2026-00631

## Affected Products

- Mattermost — Mattermost (11.5.0)
- Mattermost — Mattermost (10.11.0)
- Mattermost — Mattermost (11.6.0)
- Mattermost — Mattermost (11.5.2)
- Mattermost — Mattermost (10.11.14)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 5.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._