CVE-2026-120636

Unknown

Description

CGI versions before 5.00 for Perl allow open redirects and script injection via URLs built from REQUEST_URI in url and start_form. url(-absolute=>1), url(-relative=>1) and the default start_form action are built from the client-supplied REQUEST_URI without validation. The result can be protocol-relative (//evil.example), absolute-form (http://evil.example/) or contain backslashes, and url(-relative=>1) can return a javascript: URL. Links and form posts built from these URLs can go to another host.

SeverityUnknown

CVSS—

Exploit probability—

ProductCgi

PublishedNov 4, 2026

First seenNov 4, 2026

Weakness typeCWE-601Open redirect CWE-79Cross-site scripting (XSS)

How to fix

Update

CGI5.00 or later

Patches

github.com/leejo/CGI.pm/commit/9405ef3909ee94991a3474167aa53b9051bd8765.patch

Vendor advisories

metacpan.org/release/LEEJO/CGI-5.00/changes

Affected products

Product	Affected versions	Fixed in
CGI	v < 5.00	5.00

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