Skip to main content
VulnerabilityPublished

CVE-2026-120640: CGI versions before 5.00 for Perl allow the POSTDATA, PUTDATA, PATCHDATA and XForms:Model parameters

Source GCVE Database

0
Compare
Authoritative record:CVE-2026-120640· 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, applications should avoid relying on param('POSTDATA') or similar parameters for sensitive JSON input without additional validation and CSRF protections.

Description

CGI versions before 5.00 for Perl allow certain parameters (POSTDATA, PUTDATA, PATCHDATA, and XForms:Model) to be set from query strings or form fields, which can confuse application logic that expects these parameters to represent the actual request body. This can enable cross-site request forgery (CSRF) attacks where a malicious HTML form posts crafted data to an endpoint that reads JSON from these parameters without requiring CORS preflight.

References

Community reviews

Loading reviews…