Medium severity6.5NVD Advisory· Published May 25, 2026· Updated Jul 23, 2026
CVE-2026-4915
CVE-2026-4915
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 filter nil elements from outgoing webhook attachment payloads before processing, which allows an authenticated user to cause a denial of service (server process termination) via a crafted webhook callback response containing a null attachment entry.. Mattermost Advisory ID: MMSA-2026-00641
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/server/v8Go | < 8.0.0-20260407102538-faa7d75b4ea0 | 8.0.0-20260407102538-faa7d75b4ea0 |
Affected products
3<=11.6.0, <=11.5.3, <=11.4.4, <=10.11.14+ 1 more
- (no CPE)range: <=11.6.0, <=11.5.3, <=11.4.4, <=10.11.14
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: >=10.11.0,<10.11.15
- osv-coordsRange: < 0.0.20260723T184607-160000.1.1
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-5gmf-x7hg-97wfghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-4915ghsaADVISORY
- github.com/mattermost/mattermost/commit/faa7d75b4ea041701e97948f8aa1332e3626a39aghsaWEB
News mentions
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