Vulnerability · Published Mar 16, 2026 · Assigned by Mattermost
CVE-2026-24692Guest users can bypass read permissions via search API
Medium 4.3
In plain English
A medium-severity incorrect authorization in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly enforce read permissions in search API endpoints which allows guest users without read permissions to access posts and files in channels via search API requests. Mattermost Advisory ID: MMSA-2025-00554
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 11.2.3 | GHSA-cwfj-642j-gfh4 |
| Go | github.com/mattermost/mattermost-server | 5.3.2-0.20260107142155-0481bd1fb045 | GHSA-cwfj-642j-gfh4 |
| Go | github.com/mattermost/mattermost-server | 10.11.11 | GHSA-cwfj-642j-gfh4 |
| Go | github.com/mattermost/mattermost-server | 11.3.1 | GHSA-cwfj-642j-gfh4 |
| Go | github.com/mattermost/mattermost-server | 10.11.11+incompatible, 11.2.3+incompatible, 11.3.1+incompatible | GO-2026-4745 |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2026-4745 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2026-4745 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20260107142155-0481bd1fb045 | GO-2026-4745 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20260107142155-0481bd1fb045 | GHSA-cwfj-642j-gfh4 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 11.3.0 – through 11.3.011.2.0 – through 11.2.210.11.0 – through 10.11.10 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
References
- MMSA-2025-00554 vendor-advisory