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CVE-2021-26296: Cross-Site Request Forgery (CSRF) vulnerability in Apache MyFaces

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-19 · updated 2026-06-17
• Weakness: CWE-352

Description

In the default configuration, Apache MyFaces Core versions 2.2.0 to 2.2.13, 2.3.0 to 2.3.7, 2.3-next-M1 to 2.3-next-M4, and 3.0.0-RC1 use cryptographically weak implicit and explicit cross-site request forgery (CSRF) tokens. Due to that limitation, it is possible (although difficult) for an attacker to calculate a future CSRF token value and to use that value to trick a user into executing unwanted actions on an application.

Affected products

• Apache Myfaces: from 2.2.0 through 2.2.13; from 2.3.0 through 2.3.7; 2.3-next-m1, 2.3-next-m2, 2.3-next-m3, 2.3-next-m4, 3.0.0-rc1
• OnCommand Insight: all versions

References

• http://packetstormsecurity.com/files/161484/Apache-MyFaces-2.x-Cross-Site-Request-Forgery.html
• http://seclists.org/fulldisclosure/2021/Feb/66
• https://lists.apache.org/thread.html/r2b73e2356c6155e9ec78fdd8f72a4fac12f3e588014f5f535106ed9b%40%3Cannounce.apache.org%3E
• https://security.netapp.com/advisory/ntap-20210528-0007/
• http://packetstormsecurity.com/files/161484/Apache-MyFaces-2.x-Cross-Site-Request-Forgery.html
• http://seclists.org/fulldisclosure/2021/Feb/66
• https://lists.apache.org/thread.html/r2b73e2356c6155e9ec78fdd8f72a4fac12f3e588014f5f535106ed9b%40%3Cannounce.apache.org%3E
• https://security.netapp.com/advisory/ntap-20210528-0007/

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