Read the docs
TI-2021-19751 Aliases CVE-2021-43999GHSA-v83c-8hcj-4545

Improper validation of SAML responses

Priority MEDIUM 42CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-287.

Summary

Apache Guacamole 1.2.0 and 1.3.0 do not properly validate responses received from a SAML identity provider. If SAML support is enabled, this may allow a malicious user to assume the identity of another Guacamole user.

Why it matters now

EPSS 0.01843 79th 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
ApacheApache Guacamole1.3.0; 1.2.0—No fix listedCNA
  • Apache Guacamole VendorApache Affected 1.3.0; 1.2.0 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:apache:guacamole:1.2.0:-:*:*:*:*:*:*1.2.0VulnerableApache
cpe:2.3:a:apache:guacamole:1.3.0:-:*:*:*:*:*:*1.3.0VulnerableApache
  • cpe:2.3:a:apache:guacamole:1.2.0:-:*:*:*:*:*:* Versions 1.2.0 Vulnerable ·Apache
  • cpe:2.3:a:apache:guacamole:1.3.0:-:*:*:*:*:*:* Versions 1.3.0 Vulnerable ·Apache

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43999
  2. 2026-10-03 Alias added: GHSA-v83c-8hcj-4545

References

Advisory 2

  • TI-2019-14123 SQLite 3.30.1 mishandles certain SELECT statements with a nonexistent VIEW, leading to an application crash. CVSS 3.1HIGH 7.5
  • TI-2023-23512 Apache Guacamole: Integer overflow in handling of VNC image buffers CVSS 3.1HIGH 8.8
  • TI-2023-14404 Apache Guacamole: Use-after-free in handling of RDP audio input buffer CVSS 3.1HIGH 8.1
  • TI-2017-02374 Race condition in Apache Guacamole CVSS 3.0HIGH 8.1
  • TI-2018-01241 Prior to 1.0.0, Apache Guacamole used a cookie for client-side storage of the user's… CVSS 3.0HIGH 7.5
  • TI-2024-23239 Apache Guacamole: Improper input validation of console codes CVSS 3.1HIGH 7.5
See all 12 →

Sources

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