CVE-2021-26296Public exploitNetwork attack vector

Account actions via predictable CSRF tokens

Published Feb 19, 2021 · Updated Feb 13, 2025

Cross-site request forgery in Apache MyFaces Core 2.2.0 through 2.2.13 allows remote attackers to trigger unwanted application actions. MyfacesConfig generated implicit and explicit CSRF session tokens with predictable random values instead of SecureRandom values, allowing future tokens to be calculated. Exploitation requires tricking a user into submitting a crafted request; the resulting impact is unauthorized application actions, with exploitation described as difficult.

CVSS severity7.5
High
EPSS probability3.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Apache MyFaces Core 2.2.0 through 2.2.13 allows remote attackers to trigger unwanted application actions. MyfacesConfig generated implicit and explicit CSRF session tokens with predictable random values instead of SecureRandom values, allowing future tokens to be calculated. Exploitation requires tricking a user into submitting a crafted request; the resulting impact is unauthorized application actions, with exploitation described as difficult.

The record

CVE
CVE-2021-26296
Published
Feb 19, 2021
Updated
Feb 13, 2025
Vendor
The Apache Software Foundation
Product
Apache MyFaces Core
Classifications
CWE-352, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Apache MyFaces Core 2.2 <2.2.14
  2. Affected versionversion=Apache MyFaces Core 2.3 <2.3.8
  3. Affected versionversion=Apache MyFaces Core 2.3-next <2.3-next-M5
  4. Affected versionversion=Apache MyFaces Core 3.0 <3.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache MyFaces Coreversion=Apache MyFaces Core 2.2 <2.2.14; version=Apache MyFaces Core 2.3 <2.3.8; version=Apache MyFaces Core 2.3-next <2.3-next-M5; version=Apache MyFaces Core 3.0 <3.0.0

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
5.1NVDAV:N/AC:H/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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