CVE-2026-4646 | THREATINT

Description

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate user-supplied input in API request handlers which allows an authenticated attacker to crash the plugin process via a crafted HTTP request to the PR details endpoint.. Mattermost Advisory ID: MMSA-2026-00638

PUBLISHED Reserved 2026-03-23 | Published 2026-05-22 | Updated 2026-05-22 | Assigner Mattermost

MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Problem types

CWE-1287: Improper Validation of Specified Type of Input

Product status

Default status

unaffected

11.6.0 (semver)

affected

11.5.0 (semver)

affected

11.4.0 (semver)

affected

10.11.0 (semver)

affected

11.7.0

unaffected

11.6.1

unaffected

11.5.4

unaffected

11.4.5

unaffected

10.11.15

unaffected

Credits

Mariusz Maik finder

References

mattermost.com/security-updates (MMSA-2026-00638) vendor-advisory

cve.org (CVE-2026-4646)

nvd.nist.gov (CVE-2026-4646)

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