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CVE-2026-52846

nvd nist
Published: Jun 23, 2026Modified: Jun 29, 2026

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4.2
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Exploitability: 1.6 / Impact: 2.5
Source: security-advisories@github.com (Secondary)

Description

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.

Affected (1)

Products: Caddyserver: Caddy
Caddyserver
1 product
Caddy
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Caddy
Before 2.11.4

Related CWEs

CWE-116
Improper Encoding or Escaping of Output
The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

References (2)

Source: security-advisories@github.com
ExploitThird Party Advisory
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
ExploitThird Party Advisory

Timeline

No history available yet.