CVE-2026-120643

Unknown

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.

SeverityUnknown

CVSS—

Exploit probability—

ProductCgi

PublishedNov 4, 2026

First seenNov 4, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

CGI5.00 or later

Patches

github.com/leejo/CGI.pm/commit/851430be84c4d0f350681814e1d7718b9959f2c2.patch

Vendor advisories

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

Affected products

Product	Affected versions	Fixed in
CGI	4.62 ≤ v < 5.00	5.00

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