YARD's default template vulnerable to Cross-site Scripting in generated frames.html

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.4 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS

• CVE-2024-27285: 1.06% estimated exploitation activity in the next 30 days; percentile 64.58 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The "frames.html" file within the Yard Doc's generated documentation is vulnerable to Cross-Site Scripting (XSS) attacks due to inadequate sanitization of user input within the JavaScript segment of the "frames.erb" template file. Details The vulnerability stems from mishandling user-controlled data retrieved from the URL hash in the embedded JavaScript code within the "frames.erb" template file. Specifically, the script lacks proper sanitization of the hash data before utilizing it to establish the top-level window's location. This oversight permits an attacker to inject malicious JavaScript payloads through carefully crafted URLs. Snippet from "frames.erb": (v0.9.34) (v0.9.35) PoC (Proof of Concept) To exploit this vulnerability: 1. Gain access to the generated Yard Doc. 2. Locate and access the "frames.html" file. 3. Construct a URL containing the malicious payload in the hash segment, for instance: #!javascript:xss for v0.9.34, and #:javascript:xss for v0.9.35 Impact This…

Published by the source

28 Feb 2024, 18:57 UTC

Last modified by the source

15 Mar 2026, 05:06 UTC

Source last checked

26 Oct 2026, 15:51 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-8mq4-9jjh-9xrc

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# Patch Next advisory brief: CVE-2024-27285

Advisory: YARD's default template vulnerable to Cross-site Scripting in generated frames.html
IDs: CVE-2024-27285, GHSA-8mq4-9jjh-9xrc
Record: https://patchnext.com/advisories/cve-2024-27285 (revision 1, source checked 26 Oct 2026, 15:51 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: yard 0.9.36. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems yard: affected < 0.9.36; fixed in 0.9.36

## Suggested inspection (read-only)
- RubyGems yard: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on yard.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-8mq4-9jjh-9xrc (GitHub-reviewed advisory GHSA-8mq4-9jjh-9xrc lists affected ranges: RubyGems yard >=0 <0.9.36)

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