CVE-2026-52846
Caddy: stripHTML template function bypass
4.2
MEDIUM
CVSS 3.1
EPSS 0.15%
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.
How to fix CVE-2026-52846
To remediate CVE-2026-52846, upgrade the affected package to a fixed version below.
- —no fix listed
- —no fix listed
- —upgrade to 2.11.4 or later
Is CVE-2026-52846 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0
- from 0, <= 1.0.5
- from 0, < 2.11.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.2 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N |