Medium severity4.3NVD Advisory· Published May 22, 2026· Updated Jul 23, 2026
CVE-2026-3636
CVE-2026-3636
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 sanitize team member data when returned via API to users without elevated permissions which allows a user without permissions to get data about team members roles via invoking various team API endpoints.. Mattermost Advisory ID: MMSA-2026-00626
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 |
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
3- github.com/advisories/GHSA-ffpr-pfr4-g354ghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-3636ghsaADVISORY
News mentions
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