CVE-2026-120638

CGI versions before 5.00 for Perl allow open redirects via HTML entity decoding of the URL after application validation in redirect

State: Published
Severity: Not scored
Published: Nov 3, 2026
Updated: Nov 3, 2026
Reserved: Nov 2, 2026

Read the record on cve.org

Description

CGI versions before 5.00 for Perl allow open redirects via HTML entity decoding of the URL after application validation in redirect.

redirect decodes HTML entities in its URL before writing the Location header, so a URL the application has already validated can change meaning. For example, //evil.example/ becomes //evil.example/ and sends the user to another host.

Scores

The record has no CVSS score.

Weaknesses

CWE-180 Incorrect Behavior Order: Validate Before Canonicalize
CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

Affected Products

Product	Versions
CGI	before 5.00Affected

References

https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pmtechnical-description
https://metacpan.org/release/LEEJO/CGI-5.00/changesrelease-notes
https://github.com/leejo/CGI.pm/commit/7733c2753f4f240012097507cda2b6e87ae46db4.patchpatch

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