CVE-2026-2578
Information Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts
- State
- Published
- Severity
- 4.3 Medium
- Published
- Mar 16, 2026
- Updated
- Mar 16, 2026
- Reserved
- Feb 16, 2026
Description
Mattermost versions 11.3.x <= 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which allows channel members to access unrevealed burn-on-read message contents via the WebSocket post deletion event.. Mattermost Advisory ID: MMSA-2026-00579
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N | Mattermost |
Weaknesses
- CWE-201 Insertion of Sensitive Information Into Sent Data
Affected Products
| Product | Versions |
|---|---|
MattermostMattermost |
|
References
- MMSA-2026-00579vendor-advisory
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