CVE-2026-30851

Caddy forward_auth copy_headers Does Not Strip Client-Supplied Headers, Allowing Identity Injection and Privilege Escalation

State: Published
Severity: 8.1 High
Published: Mar 7, 2026
Updated: Mar 9, 2026
Reserved: Mar 5, 2026

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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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-287 Improper Authentication
CWE-345 Insufficient Verification of Data Authenticity

Affected Products

Product	Versions
caddycaddyserver	>= 2.10.0, < 2.11.2Affected

References

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