CVE-2026-30851

EUVD-2026-10176
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.1 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 16.08%
Affected Products (NVD)
VendorProductVersion
caddyservercaddy
2.10.0 ≤
𝑥
< 2.11.2
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
caddy
bookworm
2.6.2-5
fixed
forky
2.11.4-1
fixed
sid
2.11.4-1
fixed
trixie
2.6.2-12
fixed
trixie (security)
2.6.2-12+deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
caddy
jammy
dne
noble
needs-triage
questing
ignored
resolute
needs-triage
Common Weakness Enumeration
References
https://github.com/caddyserver/caddy/issues/6610
https://github.com/caddyserver/caddy/pull/6608
https://github.com/caddyserver/caddy/pull/7545
https://github.com/caddyserver/caddy/security/advisories/GHSA-7r4p-vjf4-gxv4