What is GHSA-c4m8-3x4v-gcxr?

GHSA-c4m8-3x4v-gcxr is a security advisory published by GitHub Security Advisories with unknown severity. CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in...

Which CVE IDs does GHSA-c4m8-3x4v-gcxr cover?

GHSA-c4m8-3x4v-gcxr covers the following CVE IDs: CVE-2026-120643. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

GHSA-c4m8-3x4v-gcxrunknown

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in...

Vendor

GitHub Security Advisories

Published

November 4, 2026

Last Modified

November 4, 2026

🔗 CVE IDs covered (1)

CVE-2026-120643 →

📋 Description

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url.

Both pass the URL through URI's canonical method, which leaves an apostrophe in the path raw and decodes the %27 that query parameter escaping produces, so an apostrophe in the request path or a parameter appears raw in the result.

An application that places the URL in a single-quoted HTML attribute or JavaScript string is open to cross-site scripting.

🔗 References (5)

https://nvd.nist.gov/vuln/detail/CVE-2026-120643
https://github.com/leejo/CGI.pm/commit/851430be84c4d0f350681814e1d7718b9959f2c2.patch
https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm
https://metacpan.org/release/LEEJO/CGI-5.00/changes
https://github.com/advisories/GHSA-c4m8-3x4v-gcxr