CVE-2026-30851 affects Caddy server versions 2.10.0 through 2.11.1, where the forward_auth copy_headers feature fails to strip client-supplied headers. This oversight allows for identity injection and privilege escalation, posing a significant security risk. With a CVSS score of 8.1 (High), the vulnerability is network-exploitable with low attack complexity, potentially leading to high confidentiality and integrity impacts. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has received minimal community discussion, with only one mention.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2.10.0, < 2.11.2CPE matchmatch criteria | cpe:2.3:a:caddyserver:caddy:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.