Read the docs
TI-2021-03154 Aliases CVE-2021-4296GHSA-9cgm-gf5x-jx5x

w3c Unicorn ValidatorNuMessage.java ValidatorNuMessage cross site scripting

Priority LOW 28CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

A vulnerability, which was classified as problematic, has been found in w3c Unicorn. This issue affects the function ValidatorNuMessage of the file src/org/w3c/unicorn/response/impl/ValidatorNuMessage.java. The manipulation of the argument message leads to cross site scripting. The attack may be initiated remotely. The name of the patch is 51f75c31f7fc33859a9a571311c67ae4e95d9c68. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-217019.

Why it matters now

EPSS 0.0056 46th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
w3cUnicornall versions—No fix listedCNA
  • Unicorn Vendorw3c Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:w3:unicorn:*:*:*:*:*:*:*:*before 2021-06-03VulnerableW3
  • cpe:2.3:a:w3:unicorn:*:*:*:*:*:*:*:* Versions before 2021-06-03 Vulnerable ·W3

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-4296
  2. 2026-10-03 Alias added: GHSA-9cgm-gf5x-jx5x

References

Patch 1

Advisory 1

  • TI-2025-01533 XML external entity injection in w3c CSS Validator CVSS 4.0HIGH 8.4
  • TI-2008-05027 Multiple stack-based buffer overflows in W3C Amaya Web Browser 10.0.1 allow remote… CVSS 2.0HIGH 10.0
  • TI-2008-05701 Multiple buffer overflows in the CheckUniqueName function in W3C Amaya Web Browser… CVSS 2.0HIGH 10.0
  • TI-2006-01845 Multiple buffer overflows in World Wide Web Consortium (W3C) Amaya 9.4, and possibly… CVSS 2.0HIGH 7.6
  • TI-2000-00079 The W3C CERN httpd HTTP server allows remote attackers to determine the real pathnames of… CVSS 2.0HIGH 7.5
  • TI-2002-01025 Cross-site scripting (XSS) vulnerability in W3C Jigsaw Proxy Server before 2.2.1 allows… CVSS 2.0MEDIUM 6.8
See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences