Low severity3.1NVD Advisory· Published May 18, 2026· Updated Jun 17, 2026
CVE-2026-6334
CVE-2026-6334
Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce client identity binding during the OAuth authorization code redemption flow which allows an authenticated OAuth client to redeem authorization codes issued to a different client via a crafted token exchange request.. Mattermost Advisory ID: MMSA-2026-00570
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 | < 8.0.0-20260318173148-e9ae890a013b | 8.0.0-20260318173148-e9ae890a013b |
github.com/mattermost/mattermost-serverGo | < 5.3.2-0.20260318173148-e9ae890a013b | 5.3.2-0.20260318173148-e9ae890a013b |
Affected products
3cpe: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: <= 11.5.1, <= 10.11.13
- osv-coordsRange: < 0.0.20260723T184607-160000.1.1
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-jp3f-x449-4q75ghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-6334ghsaADVISORY
- github.com/mattermost/mattermost/commit/e9ae890a013bb57989fcbdb548d8b7b86b240237ghsaWEB
News mentions
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