CVSS 3.1
4.2 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:NCVE-2026-52846
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-31)
- CWE
- CWE-116
- Published
- Modified
- Record from
- the NVD, synced
Affected
- caddyserver:caddy
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-vcc4-2c75-vc9v | Go | github.com/caddyserver/caddy/v2 | <2.11.4 | 2.11.4 |
| GHSA-vcc4-2c75-vc9v | Go | github.com/caddyserver/caddy | <=1.0.5 | no fix published |
| GO-2026-5660 | Go | github.com/caddyserver/caddy/v2 | <2.11.4 | 2.11.4 |