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VulnerabilityPublished

CVE-2026-120638: CGI versions before 5.00 for Perl allow open redirects via HTML entity decoding of the URL after

Source GCVE Database

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Authoritative record:CVE-2026-120638· High

Not known to be exploited : upgrade to 5.00 soon.

Data as of 4 Nov 2026, 01:59 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 5.00

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

What to do

Upgrade CGI (Perl module) to 5.00.

Affected software

ProductAffectedFixed in
CGIAffected
  • <5.00
Fixed in
  • 5.00
CPANCGIpkg:cpan/CGIOther threatsAffected
  • <5.00
Fixed in
  • 5.00

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, users should be cautious about relying solely on URL validation that occurs before HTML entity decoding in redirects.

Description

CGI versions before 5.00 for Perl contain an open redirect vulnerability due to HTML entity decoding of URLs after application validation. This allows an attacker to craft URLs that bypass validation and redirect users to arbitrary external sites.

References

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