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CVE-2021-21678

28
FAUCET Score

CVE-2021-21678 describes a critical vulnerability in Jenkins SAML Plugin versions 2.0.7 and earlier, allowing attackers to bypass Cross-Site Request Forgery (CSRF) protection for any target URL within Jenkins. With a CVSS score of 8.8 (High), this vulnerability is easily exploitable over the network with low attack complexity, potentially leading to high impact on confidentiality, integrity, and availability. Despite its severity, there is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.1.3, <= 2.0.7CPE matchmatch criteria
cpe:2.3:a:jenkins:saml:*:*:*:*:*:jenkins:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.81%
Probability of exploitation in next 30 days
EPSS Percentile
53.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0081 is in the 55th percentile among its peer group of 14,855 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

mavenpatch availablevia ghsa
Product: org.jenkins-ci.plugins:samlFixed in: 2.0.8
jenkinsvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

mavenGHSA-r5w3-pfq8-3r82high

Jenkins SAML Plugin allows bypassing CSRF protection for any URL

May 24, 2022

References

jenkins.io / security/advisory/2021-08-31
Vendor Advisory
openwall.com / lists/oss-security/2021/08/31/1
Mailing ListThird Party Advisory