Threat Intelligence Database

CVE-2026-52846 is a vulnerability in the Caddy web server prior to version 2.11.4. The issue lies in the stripHTML template function, which fails to reliably remove all HTML tags from input strings. Malformed HTML inputs can bypass this tag-stripping logic, potentially allowing dangerous content to remain in output rendered as HTML. This may lead to client-side cross-site scripting (XSS) if untrusted strings are rendered unsafely. The vulnerability has a medium severity with a CVSS score of 4.2 and is fixed in version 2.11.4.

CVE-2026-52845 is an improper authentication vulnerability in caddyserver caddy prior to version 2.11.4. The issue arises because the forward_auth copy_headers feature deletes client-supplied identity headers but does not account for underscore aliases that survive deletion and later normalize into the same PHP/FastCGI variables. This allows remote clients to inject or override trusted identity or group headers in PHP/FastCGI applications behind Caddy. The vulnerability is fixed in version 2.11.4.

Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, on Windows, Caddy path matchers treat /private\secret.txt as outside /private/*, but file_server later resolves the same request path as private\secret.txt on disk. An unauthenticated remote client can bypass Caddy path-scoped auth/deny routes protecting /private/*. This vulnerability is fixed in 2.11.4.

CVE-2026-45692 affects the caddyserver caddy platform versions from 2.4.0 up to but not including 2.11.3. The vulnerability arises because the authorization layer uses string prefix matching for path authorization, while the /config traversal layer interprets array indices numerically. This mismatch can cause a path authorized for one configuration object to resolve to a different object during traversal. The issue is fixed in version 2.11.3.

Caddy is an extensible server platform that uses TLS by default. From 2.7.0 until 2.11.3, the FastCGI transport's splitPos() in modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go misuses golang.org/x/text/search with search.IgnoreCase when the request path contains a non-ASCII byte. Two distinct flaws in that fallback let an attacker mislead Caddy's FastCGI splitting into treating a non-.php (or other configured split_path extension) file as a script. In any deployment where the attacker can place content into a file served via FastCGI (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This vulnerability is fixed in 2.11.3.