High severityNVD Advisory· Published Mar 7, 2026· Updated Mar 9, 2026
Caddy forward_auth copy_headers Does Not Strip Client-Supplied Headers, Allowing Identity Injection and Privilege Escalation
CVE-2026-30851
Description
Caddy is an extensible server platform that uses TLS by default. From version 2.10.0 to before version 2.11.2, forward_auth copy_headers does not strip client-supplied headers, allowing identity injection and privilege escalation. This issue has been patched in version 2.11.2.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/caddyserver/caddy/v2/modules/caddyhttp/reverseproxyGo | >= 2.10.0, < 2.11.2 | 2.11.2 |
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
6- github.com/advisories/GHSA-7r4p-vjf4-gxv4ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-30851ghsaADVISORY
- github.com/caddyserver/caddy/issues/6610ghsax_refsource_MISCWEB
- github.com/caddyserver/caddy/pull/6608ghsax_refsource_MISCWEB
- github.com/caddyserver/caddy/pull/7545ghsax_refsource_MISCWEB
- github.com/caddyserver/caddy/security/advisories/GHSA-7r4p-vjf4-gxv4ghsax_refsource_CONFIRMWEB
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