Low severity3.5NVD Advisory· Published May 18, 2026· Updated May 19, 2026
CVE-2026-6333
CVE-2026-6333
Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost Advisory ID: MMSA-2026-00582
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 | >= 10.11.0, < 10.11.14 | 10.11.14 |
github.com/mattermost/mattermost/server/v8Go | < 8.0.0-20260325160634-e738016c5920 | 8.0.0-20260325160634-e738016c5920 |
github.com/mattermost/mattermost-serverGo | < 5.3.2-0.20260325160634-e738016c5920 | 5.3.2-0.20260325160634-e738016c5920 |
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
- ghsa-coords2 versionspkg:golang/github.com/mattermost/mattermost-serverpkg:golang/github.com/mattermost/mattermost/server/v8
< 5.3.2-0.20260325160634-e738016c5920+ 1 more
- (no CPE)range: < 5.3.2-0.20260325160634-e738016c5920
- (no CPE)range: >= 11.5.0, < 11.5.2
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-vqp5-2mrp-qqxgghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-6333ghsaADVISORY
- github.com/mattermost/mattermost/commit/e738016c592045e14bf926eafaeda6f8521def6dghsaWEB
News mentions
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