GHSA-jmvr-r5hm-fxfr

ghsaUSosv

Mattermost doesn't enforce request body size limits on plugin HTTP endpoints

view advisory published 2026-05-26Licence: CC-BY-4.0

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 enforce request body size limits on plugin HTTP endpoints which allows an attacker to cause a denial of service via crafted oversized HTTP requests.. Mattermost Advisory ID: MMSA-2026-00646

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-5308US	high7.5	0.25% (17th)	—	2026-05-22
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 enforce request body size limits on plugin HTTP endpoints which allows an atta…

references

External citations — patches, advisories, analysis.

https://github.com/mattermost/mattermostPACKAGE
https://github.com/mattermost/mattermost-plugin-github/commit/9b41b1fd43c408f4be53026ee337bbeaa74ad47cWEB
https://mattermost.com/security-updatesWEB
https://nvd.nist.gov/vuln/detail/CVE-2026-5308ADVISORY

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