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Vulnerabilities

Vulnerability · CVE-2026-118660

Happy DOM: SSRF via iframe and link stylesheet when parsing untrusted HTML

Published Oct 28, 2026 · Happy DOM: SSRF via

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-118660. EPSS is 0.40%. Act only if a listed version of Happy DOM: SSRF via is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Happy DOM: SSRF via).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.40%
Remediation
Not established
Affected products
npm happy-dom · package npm

happy-dom v20.8.9 makes real server-side HTTP requests to arbitrary URLs when parsing HTML containing or elements. This behavior is enabled by default (disableIframePageLoading: false, disableCSSFileLoading: false). When an application uses happy-dom to parse untrusted HTML on the server side, an attacker can trigger Server-Side Request Forgery by embedding these elements.

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.

  • npm happy-domversion unspecified
  • package npmversion unspecified

How to fix CVE-2026-118660

What to do

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

Should you patch?

No confirmed exploitation is on record for CVE-2026-118660. EPSS is 0.40%. Act only if a listed version of Happy DOM: SSRF via is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.40%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

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

Timeline

Detection, updates, and resolution for this record.

  1. Oct 28, 2026 · GitLab Advisory Database

    Detected

    happy-dom v20.8.9 makes real server-side HTTP requests to arbitrary URLs when parsing HTML containing or elements. This behavior is enabled by default (disableIframePageLoading: false, disableCSSFileLoading: false). When an application uses happy-dom to parse untrusted HTML on the server side, an attacker can trigger Server-Side Request Forgery by embedding these elements.

Sources

  • CVE.orgVulnerability recordCVE-2026-118660

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-118660

    30-day exploitation probability 0.40%

    first.org
  • GitLab Advisory DatabasePackage advisoryCVE-2026-118660

    happy-dom v20.8.9 makes real server-side HTTP requests to arbitrary URLs when parsing HTML containing or elements. This behavior is enabled by default (disableIframePageLoading: false, disableCSSFileLoading: false). When an application uses happy-dom to parse untrusted HTML on the server side, an attacker can trigger Server-Side Request Forgery by embedding these elements.

    advisories.gitlab.com
  • Snyk Vulnerability DatabasePackage advisorySNYK-JS-HAPPYDOM-21826830

    Server-side Request Forgery (SSRF)

    security.snyk.io

Freshness

Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 4, 2026
  • Snyk Vulnerability DatabaseNov 1, 2026
  • GitLab Advisory DatabaseOct 30, 2026
  • CVE.orgOct 29, 2026