Server-side Request Forgery (SSRF) Affecting github.com/mattermost/mattermost/server/public/shared/httpservice package, versions <10.11.11>=11.2.0-rc1 <11.2.3>=11.3.0-rc1 <11.3.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMMATTERMOSTMATTERMOSTSERVERPUBLICSHAREDHTTPSERVICE-15702110
- published20 Mar 2026
- disclosed16 Mar 2026
- creditwinfunc
Introduced: 16 Mar 2026
CVE-2026-2455 Â (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/public/shared/httpservice to version 10.11.11, 11.2.3, 11.3.1 or higher.
Overview
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) in the IP address validation process. An attacker can access internal network resources by submitting specially crafted IPv4-mapped IPv6 literals to bypass reserved IP checks.