cve.bz

CVE-2026-4646

4.3 mediumEPSS 0.2%

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

Severity

CVSS 3.1

4.3 medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
EPSS
0.2% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-31)
CWE
CWE-1287
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-rmvv-8v8w-rf7xGogithub.com/mattermost/mattermost-server>=11.6.0 <11.6.111.6.1
GHSA-rmvv-8v8w-rf7xGogithub.com/mattermost/mattermost-server>=11.5.0 <11.5.411.5.4
GHSA-rmvv-8v8w-rf7xGogithub.com/mattermost/mattermost-server>=11.4.0 <11.4.511.4.5
GHSA-rmvv-8v8w-rf7xGogithub.com/mattermost/mattermost-server>=10.11.0 <10.11.1510.11.15
GHSA-rmvv-8v8w-rf7xGogithub.com/mattermost/mattermost-plugin-github<1.0.1-0.20260330164815-c2840e980b3c1.0.1-0.20260330164815-c2840e980b3c
GO-2026-5833Gogithub.com/mattermost/mattermost-plugin-github<1.0.1-0.20260330164815-c2840e980b3c1.0.1-0.20260330164815-c2840e980b3c
GO-2026-5833Gogithub.com/mattermost/mattermost-server>=10.11.0+incompatible <10.11.15+incompatible
>=11.4.0+incompatible <11.4.5+incompatible
>=11.5.0+incompatible <11.5.4+incompatible
>=11.6.0+incompatible <11.6.1+incompatible		10.11.15+incompatible, 11.4.5+incompatible, 11.5.4+incompatible, 11.6.1+incompatible

References

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