How severe is CVE-2021-26296?

CVE-2021-26296 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-26296 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26296?

CVE-2021-26296 primarily affects Apache Myfaces. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-26296?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-26296 published?

CVE-2021-26296 was published on 2021-02-19 and last updated on 2026-06-17.

CVE-2021-26296

CVE-2021-26296 is a high-severity vulnerability in Apache Myfaces with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-352.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.1
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Apache Myfaces
Published: 2021-02-19
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-26296?: 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.
How severe is CVE-2021-26296?: CVE-2021-26296 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-26296 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26296?: CVE-2021-26296 primarily affects Apache Myfaces. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-26296?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-26296 published?: CVE-2021-26296 was published on 2021-02-19 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:a:apache:myfaces:*:*:*:*:*:*:*:*
cpe:2.3:a:apache:myfaces:2.3:next-m1:*:*:*:*:*:*
cpe:2.3:a:apache:myfaces:2.3:next-m2:*:*:*:*:*:*
cpe:2.3:a:apache:myfaces:2.3:next-m3:*:*:*:*:*:*
cpe:2.3:a:apache:myfaces:2.3:next-m4:*:*:*:*:*:*
cpe:2.3:a:apache:myfaces:3.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*

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