CVE-2021-26296

Name: CVE-2021-26296
Creator: NVD / NIST
Published: 2021-02-19T09:15:13.283+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.03%

Last modified Jun 17, 2026

CVE-2021-26296 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 3.03% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

3.03%

85.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Apache	Myfaces	>= 2.2.0, <= 2.2.13	—
Apache	Myfaces	>= 2.3.0, <= 2.3.7	—
Apache	Myfaces	2.3	Next-M1
Apache	Myfaces	3.0.0	Rc1
Netapp	Oncommand Insight	All versions	—

References

http://packetstormsecurity.com/files/161484/Apache-MyFaces-2.x-Cross-Site-Request-Forgery.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Feb/66Mailing List, Third Party Advisory
https://lists.apache.org/thread.html/r2b73e2356c6155e9ec78fdd8f72a4fac12f3e588014f5f535106ed9b%40%3Cannounce.apache.org%3EMailing List, Vendor Advisory
https://security.netapp.com/advisory/ntap-20210528-0007/Third Party Advisory
http://packetstormsecurity.com/files/161484/Apache-MyFaces-2.x-Cross-Site-Request-Forgery.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Feb/66Mailing List, Third Party Advisory
https://lists.apache.org/thread.html/r2b73e2356c6155e9ec78fdd8f72a4fac12f3e588014f5f535106ed9b%40%3Cannounce.apache.org%3EMailing List, Vendor Advisory
https://security.netapp.com/advisory/ntap-20210528-0007/Third Party Advisory

Timeline

Published: Feb 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26296?

How severe is CVE-2021-26296?

CVE-2021-26296 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.03% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26296?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26296?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST