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CVE-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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3cd8eb6fd33708a3b7ade23cd1676d071085d26e01392fec3fcd92a5016a46f8
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"caddy","vendor":"caddyserver","versions":[{"status":"affected","version":"< 2.11.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:dd18137e2d328de29eaeac16a8ec837acc32a1b3a8eb913065fa2e0bf87c2840 · sha256:fb0e5585cf6000c5… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.2,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:dd18137e2d328de29eaeac16a8ec837acc32a1b3a8eb913065fa2e0bf87c2840 · sha256:fb0e5585cf6000c5… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-116","description":"CWE-116: Improper Encoding or Escaping of Output","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dd18137e2d328de29eaeac16a8ec837acc32a1b3a8eb913065fa2e0bf87c2840 · sha256:fb0e5585cf6000c5… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/caddyserver/caddy/security/advisories/GHSA-vcc4-2c75-vc9v"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dd18137e2d328de29eaeac16a8ec837acc32a1b3a8eb913065fa2e0bf87c2840 · sha256:fb0e5585cf6000c5… · /containers/adp/0/references/0
{"name":"https://github.com/caddyserver/caddy/security/advisories/GHSA-vcc4-2c75-vc9v","tags":["x_refsource_CONFIRM"],"url":"https://github.com/caddyserver/caddy/security/advisories/GHSA-vcc4-2c75-vc9v"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dd18137e2d328de29eaeac16a8ec837acc32a1b3a8eb913065fa2e0bf87c2840 · sha256:fb0e5585cf6000c5… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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