Medium severity4.3NVD Advisory· Published May 22, 2026· Updated Jul 23, 2026
CVE-2026-4646
CVE-2026-4646
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
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/mattermost/mattermost-serverGo | >= 11.6.0, < 11.6.1 | 11.6.1 |
github.com/mattermost/mattermost-serverGo | >= 11.5.0, < 11.5.4 | 11.5.4 |
github.com/mattermost/mattermost-serverGo | >= 11.4.0, < 11.4.5 | 11.4.5 |
github.com/mattermost/mattermost-serverGo | >= 10.11.0, < 10.11.15 | 10.11.15 |
github.com/mattermost/mattermost-plugin-githubGo | < 1.0.1-0.20260330164815-c2840e980b3c | 1.0.1-0.20260330164815-c2840e980b3c |
Affected products
3cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: >=10.11.0,<10.11.15
- (no CPE)range: <=11.6.0, <=11.5.3, <=11.4.4, <=10.11.14
- osv-coordsRange: < 0.0.20260723T184607-160000.1.1
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-rmvv-8v8w-rf7xghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-4646ghsaADVISORY
- github.com/mattermost/mattermost-plugin-github/commit/c2840e980b3c2bd08db656eaa6a0fe26bcbf4695ghsaWEB
News mentions
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