CVSS 3.1
8.8 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVE-2026-30851
High (8.8) in caddyserver caddy. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in github.com/caddyserver/caddy/v2/modules/caddyhttp/reverseproxy 2.11.2.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 17% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-287, CWE-345
- Published
- Modified
- Record from
- the NVD, synced
Affected
- caddyserver:caddy
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-7r4p-vjf4-gxv4 | Go | github.com/caddyserver/caddy/v2/modules/caddyhttp/reverseproxy | >=2.10.0 <2.11.2 | 2.11.2 |
| GO-2026-4639 | Go | github.com/caddyserver/caddy/v2 | >=2.10.0 <2.11.2 | 2.11.2 |