CVE-2026-30851CWE-287CWE-345

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

High · published March 7, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
28.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00360 · 28.6th percentile
Weaknesses
CWE-287 · Improper Authentication; CWE-345 · Insufficient Verification of Data Authenticity
Published
2026-03-07T16:28Z
EPSS history
Timeline
  • 07 MAR 16:28Z
    Caddy forward_auth copy_headers Does Not Strip Client-Supplied Headers, Allowing Identity Injection and Privilege Escalation
    cvelistv5