CVE-2026-52846
Medium
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.
SeverityMedium
CVSS4.2
Exploit probability—
Product
Caddy
PublishedJun 23, 2026
First seenJun 23, 2026
Weakness typeCWE-116CWE-116
How to fix
Update
- caddyserver caddy2.11.4 or later
- github.com/caddyserver/caddy/v22.11.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| caddyserver caddy | v < 2.11.4 | 2.11.4 |
| github.com/caddyserver/caddy/v2Go | v < 2.11.4 | 2.11.4 |
| github.com/caddyserver/caddyGo | v ≤ 1.0.5 | — |
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