What’s Vulnerable › Vulnerabilities

CVE-2021-43999: Improper validation of SAML responses

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-11 · updated 2026-06-17
• Weakness: CWE-287

Description

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.

Affected products

• Apache Software Foundation Apache Guacamole: 1.2.0, 1.3.0

References

• http://www.openwall.com/lists/oss-security/2022/01/11/7
• https://lists.apache.org/thread/4dt9h5mo4o9rxlgxm3rp8wfqdtdjn2z9
• http://www.openwall.com/lists/oss-security/2022/01/11/7
• https://lists.apache.org/thread/4dt9h5mo4o9rxlgxm3rp8wfqdtdjn2z9

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