Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, Caddy’s stripHTML template function cannot reliably remove all HTML tags from input strings. Certain malformed HTML, such as <<>img src=x onerror=alert()>, can bypass the tag-stripping logic, potentially leaving dangerous content in the output if it is later rendered as HTML. This may allow client-side XSS in cases where untrusted strings are rendered unsafely. This vulnerability is fixed in 2.11.4.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, Caddy's stripHTML     template function cannot reliably remove all HTML tags from input strings. Certain malformed HTML, such as     <<>img src=x onerror=alert()>, can bypass the tag-stripping logic, potentially leaving dangerous content     in the output if it is later rendered as HTML. This may allow client-side XSS in cases where untrusted     strings are rendered unsafely. This vulnerability is fixed in 2.11.4. (CVE-2026-52846)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, Caddy’s stripHTML
    template function cannot reliably remove all HTML tags from input strings. Certain malformed HTML, such as
    <<>img src=x onerror=alert()>, can bypass the tag-stripping logic, potentially leaving dangerous content
    in the output if it is later rendered as HTML. This may allow client-side XSS in cases where untrusted
    strings are rendered unsafely. This vulnerability is fixed in 2.11.4. (CVE-2026-52846)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 94f93681-6775-11f1-8044-002590af0794 advisory.

    Caddy project reports:
    Caddy 2.11.4 contains multiple security fixes.
    GitHub Security Advisory GHSA-qrp7-cvwr-j2c6 reports:
    Windows-encoded backslashes in request paths could bypass           path-scoped authorization rules before files are served by           file_server.
    GitHub Security Advisory GHSA-f59h-q822-g45g reports:
    forward_auth copy_headers could fail to remove           underscore aliases of copied identity headers before FastCGI header           normalization, allowing identity or group header spoofing.
    GitHub Security Advisory GHSA-vcc4-2c75-vc9v reports:
    The stripHTML template function could fail to remove           malformed HTML, potentially allowing client-side cross-site           scripting if untrusted output is later rendered as HTML.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
322459	Linux Distros Unpatched Vulnerability : CVE-2026-52846	Nessus	Misc.	medium
443340	SCA: security update for github.com/caddyserver/caddy/v2 (GHSA-vcc4-2c75-vc9v)	Tenable Cloud Security	SCA Checks	medium
443340	SCA: security update for github.com/caddyserver/caddy/v2 (GHSA-vcc4-2c75-vc9v)	Tenable Self-Hosted Container Security	SCA Checks	medium
321073	FreeBSD : caddy -- multiple vulnerabilities (94f93681-6775-11f1-8044-002590af0794)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2026-52846

medium

Tenable Plugins

medium

medium

medium

high