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Vulnerabilities

Vulnerability · CVE-2026-52846

Caddy is an extensible server platform that uses TLS by default.

Published Jun 23, 2026 · catalog updated Oct 24, 2026 · Caddy is an extensible

Open the advisory

Exploitation likelihood is not on this record for CVE-2026-52846. A missing EPSS score is not a low risk. Compare Caddy is an extensible with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Caddy is an extensible).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Medium4.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Not in the current FIRST EPSS dataset
Remediation
Advisory link
Affected products
Debian:12 caddy · Debian:13 caddy · Debian:14 caddy

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 caddy0 → 2.6.2-5+deb12u1
  • Debian:13 caddy0 → 2.6.2-12+deb13u1
  • Debian:14 caddy0 → 2.11.4-1

How to fix CVE-2026-52846

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for CVE-2026-52846. A missing EPSS score is not a low risk. Compare Caddy is an extensible with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 0 → 2.6.2-5+deb12u1, 0 → 2.6.2-12+deb13u1, 0 → 2.11.4-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is absent from the current FIRST dataset. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 23, 2026 · Trivy Vulnerability DB

    Detected

    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 wher

  2. Oct 24, 2026 · Trivy Vulnerability DB

    Fix available

    caddy fixed in 2.6.2-5+deb12u1; caddy fixed in 2.6.2-12+deb13u1; caddy fixed in 2.11.4-1

  3. Oct 24, 2026 · Trivy Vulnerability DB

    Fix available

    caddy fixed in 2.6.2-5+deb12u1

  4. Oct 24, 2026 · Trivy Vulnerability DB

    Fix available

    caddy fixed in 2.6.2-12+deb13u1

  5. Oct 24, 2026 · Trivy Vulnerability DB

    Fix available

    caddy fixed in 2.11.4-1

  6. Oct 24, 2026 · Trivy Vulnerability DB

    Updated

    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 wher

Sources

  • CVE.orgVulnerability recordCVE-2026-52846

    Official CVE identifier

    cve.org
  • Trivy Vulnerability DBPackage advisoryDEBIAN-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, potential

    osv.dev

References

Freshness

Last verified in this catalog Oct 24, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.