🛡️ CVE-2025-13352 — mattermost-server

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity low, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
• Privileges required: Low — an ordinary user account is enough.
• User interaction: Required — someone has to click, open or visit something.
• Scope: Changed — a successful attack reaches components beyond the vulnerable one.
• Confidentiality impact: None.
• Integrity impact: Low — limited, and the attacker does not choose what is affected.
• Availability impact: None.

Weakness class

CVE-2025-13352 is classified as CWE-1287: Improper Validation of Specified Type of Input. The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.

Affected software

CVE-2025-13352 is recorded against 7 packages.

• github.com/mattermost/mattermost
• github.com/mattermost/mattermost-plugin-github
• github.com/mattermost/mattermost-server
• github.com/mattermost/mattermost-server/v5
• github.com/mattermost/mattermost-server/v6
• github.com/mattermost/mattermost/server/v8
• mattermost-server (from 10.11.0 up to 10.11.7)

Timeline and source

Published on 17 December 2025 and last revised on 3 March 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
mattermost.com (Web)

Other advisories for this package

github.com/mattermost/mattermost has other advisories on record. If you are patching this one, these are worth checking on the same host:

• CVE-2025-62690 (2.0 Low, published 17 Dec 2025)
• CVE-2025-13324 (published 17 Dec 2025)
• CVE-2025-12756 (published 2 Dec 2025)
• CVE-2025-13870 (2.0 Low, published 2 Dec 2025)
• CVE-2025-11777 (2.0 Low, published 17 Nov 2025)
• CVE-2025-11776 (published 14 Nov 2025)
• CVE-2020-14457 (published 20 Aug 2024)
• CVE-2024-41926 (published 1 Aug 2024)

Same weakness in other software

These advisories are the same class of weakness (CWE-1287: Improper Validation of Specified Type of Input) in other software:

• CVE-2026-18830 (8.1 High, published 4 Aug 2026)
• CVE-2026-20498 (6.0 Medium, published 3 Aug 2026)
• CVE-2026-4773 (8.1 High, published 22 Jul 2026)
• CVE-2026-50524 (8.0 High, published 20 Jul 2026)
• CVE-2026-54235 (6.5 Medium, published 13 Jul 2026)
• CVE-2026-52763 (published 9 Jul 2026)
• CVE-2026-4646 (4.3 Medium, published 7 Jul 2026)
• CVE-2025-1057 (published 7 Jul 2026)

Details

Affected Packages

References