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Back to active CVEs
Unknown severity ยท Source severity not reportedCVE-2026-120643

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_urlCVE-2026-120643

Answer in brief

CVE-2026-120643 records a Unknown severity vulnerability in 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. The current sources do not mark it as known exploited. The current feed maps CGI (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 3, 2026Updated Nov 3, 2026Source checked Nov 4, 2026First seen by HOL Nov 3, 2026Material review Nov 3, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps CGI (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
CGIgeneric>=4.62 <5.005.00

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for CGI.
  2. 2Review the reported fix. Source-reported solution: Upgrade to CGI 5.00 or later.

Evidence timeline and material changes

  1. Published upstream

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 3, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencemetacpan.org
  • Source referencemetacpan.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • CGI versions before 5.00 for Perl trust the client X-Forwarded-Host header in url, self_url, virtual_host and virtual_portSame cgi package
  • CGI::Carp versions before 5.00 for Perl leak warnings across requests in persistent environments via the warningsToBrowser bufferSame cgi package
  • CGI versions before 5.00 for Perl allow form fields to be smuggled past proxies and WAFs via multipart parsing that differs from the RFCsSame cgi package
  • CGI versions before 5.00 for Perl allow open redirects and script injection via URLs built from REQUEST_URI in url and start_formSame cgi package
  • CGI versions before 5.00 for Perl take request parameters from the process command line arguments for an unrecognised REQUEST_METHODSame cgi package
  • CGI versions before 5.00 for Perl allow open redirects via HTML entity decoding of the URL after application validation in redirectSame cgi package

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Nov 4, 2026
References
3 linked sources
Open source record