CVE-2026-30851

high

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.

References

https://github.com/caddyserver/caddy/security/advisories/GHSA-7r4p-vjf4-gxv4

https://github.com/caddyserver/caddy/pull/7545

https://github.com/caddyserver/caddy/pull/6608

https://github.com/caddyserver/caddy/issues/6610

Details

Source: Mitre, NVD

Published: 2026-03-07

Updated: 2026-03-11

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00015