CVE WatchJul 15, 2026

CVE-2026-52845

Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, forward_auth copy_headers deletes the exact client-supplie

CVSS

8.1

High

EPSS

0.3%

p21

KEV

—

Exploit Today

0-100

Published: Jun 23, 2026 · Last modified: Jul 15, 2026 · CWE-287 · CWE-290 · CWE-444

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-08-102026-09-06

Technical description

Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, forward_auth copy_headers deletes the exact client-supplied identity header before copying the trusted value from the auth gateway. But when the request later goes through php_fastcgi, Caddy normalizes HTTP headers into CGI variables by replacing - with _. This lets a client send an underscore alias that survives the forward_auth delete step but becomes the same PHP/FastCGI variable. Result: a remote client can inject or sometimes override identity/group headers trusted by PHP/FastCGI applications behind Caddy. This vulnerability is fixed in 2.11.4.

Official references

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