Medium severity4.3NVD Advisory· Published May 18, 2026· Updated May 18, 2026
CVE-2026-6343
CVE-2026-6343
Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check public/private permissions which allows members without these permissions to access public playbooks via /get.. Mattermost Advisory ID: MMSA-2026-00591
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/server/v8Go | >= 11.5.0, < 11.5.2 | 11.5.2 |
github.com/mattermost/mattermost/server/v8Go | >= 11.4.0, < 11.4.4 | 11.4.4 |
github.com/mattermost/mattermost/server/v8Go | >= 10.11.0, < 10.11.14 | 10.11.14 |
github.com/mattermost/mattermost-plugin-playbooksGo | < 1.41.1-0.20260309184833-887d9cacb616 | 1.41.1-0.20260309184833-887d9cacb616 |
Affected products
4cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: >=10.11.0,<10.11.14
- (no CPE)range: 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3
- ghsa-coords2 versionspkg:golang/github.com/mattermost/mattermost-plugin-playbookspkg:golang/github.com/mattermost/mattermost/server/v8
< 1.41.1-0.20260309184833-887d9cacb616+ 1 more
- (no CPE)range: < 1.41.1-0.20260309184833-887d9cacb616
- (no CPE)range: >= 11.5.0, < 11.5.2
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-m79q-8qf5-v622ghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-6343ghsaADVISORY
- github.com/mattermost/mattermost-plugin-playbooks/commit/887d9cacb61655d40f20ad9d6e35b408a127c380ghsaWEB
News mentions
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