---
id: CVE-2026-120643
title: >-
  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
summary: >-
  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 t…
severity: none
cwe:
  - CWE-79
product: CGI
affected:
  - CGI >= 4.62 < 5.00
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T23:40:48.770Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120643'
references:
  - url: 'https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm'
  - url: 'https://metacpan.org/release/LEEJO/CGI-5.00/changes'
  - url: >-
      https://github.com/leejo/CGI.pm/commit/851430be84c4d0f350681814e1d7718b9959f2c2.patch
tags:
  - cve.org
epss: 0.00208
epssPercentile: 0.11059
ingestedAt: '2026-11-05T20:33:06.616Z'
---

## Overview

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.

## Affected

- `CGI >= 4.62 < 5.00`

## Remediation

Upgrade to CGI 5.00 or later.