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

Exp

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.

Published: 2021-02-19 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-26296 is rated High Exploit Risk (77.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.03%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.70% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-26296

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-26296

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.32% 3.03% +2.70%
2 2026-02-16 0.46% 0.32% -0.14%
3 2025-12-10 — 0.46% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-26296

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.6 5.9 [email protected]
5.1 2.0 MEDIUM
AV:N/AC:H/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 4.9 6.4 [email protected]

Weakness enumeration for CVE-2021-26296

GitHub Security Advisory for CVE-2021-26296

GHSA-gq67-pp9w-43gp · Severity: high · Ecosystem: maven — Cryptographically weak CSRF tokens in Apache MyFaces

OS Trackers for CVE-2021-26296

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2021-26296

Affected software / configurations for CVE-2021-26296

Vendor Product Version Raw CPE
apache myfaces >= 2.2.0, <= 2.2.13 cpe:2.3:a:apache:myfaces:*:*:*:*:*:*:*:*
apache myfaces >= 2.3.0, <= 2.3.7 cpe:2.3:a:apache:myfaces:*:*:*:*:*:*:*:*
apache myfaces 2.3 cpe:2.3:a:apache:myfaces:2.3:next-m1:*:*:*:*:*:*
apache myfaces 2.3 cpe:2.3:a:apache:myfaces:2.3:next-m2:*:*:*:*:*:*
apache myfaces 2.3 cpe:2.3:a:apache:myfaces:2.3:next-m3:*:*:*:*:*:*
apache myfaces 2.3 cpe:2.3:a:apache:myfaces:2.3:next-m4:*:*:*:*:*:*
apache myfaces 3.0.0 cpe:2.3:a:apache:myfaces:3.0.0:rc1:*:*:*:*:*:*
netapp oncommand_insight — cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*

References for CVE-2021-26296

cvelogic Threat Intelligence