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Fencer Vulns
medium 6.5

CVE-2021-21623 json

Incorrect permission checks in Jenkins Matrix Authorization Strategy Plugin may allow accessing some items

published 2021-03-18 5 y ago modified 2026-06-17 4 mo ago also GHSA-96jw-3xw4-mq9p , EUVD-2022-3304

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

An incorrect permission check in Jenkins Matrix Authorization Strategy Plugin 2.6.5 and earlier allows attackers with Item/Read permission on nested items to access them, even if they lack Item/Read permission for parent folders.

Patch / fix

  • maven org.jenkins-ci.plugins:matrix-auth 2.6.6
  • Jenkins project Jenkins Matrix Authorization Strategy Plugin 2.5.2, 2.6.3.1
  • runc openshift 4.8 1.0.0-98.rhaos4.8.gitcd80260.el7
  • runc openshift 4.8 1.0.0-98.rhaos4.8.gitcd80260.el8
  • cri-o openshift 4.8 1.21.2-5.rhaos4.8.gitb27d974.el7
  • cri-o openshift 4.8 1.21.2-5.rhaos4.8.gitb27d974.el8
  • butane openshift 4.8 0.12.1-1.rhaos4.8.el8
  • ostree openshift 4.8 2020.7-5.el8_4
  • podman openshift 4.8 3.0.1-6.el8
  • haproxy openshift 4.8 2.2.13-1.el7

red hat advisories RHSA-2021:2437

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-21623 updated cvss 6.5

jenkins-2-plugins/matrix-auth: Incorrect permission checks in Matrix Authorization Strategy Plugin

  • Red Hat OpenShift Container Platform 3.11 jenkins, jenkins-2-plugins
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4 jenkins-2-plugins
    affected: no fix available
  • Red Hat OpenShift Container Platform 4.8 jenkins 2.289.1.1624020353-1.el8
    fixed: vendor fix RHSA-2021:2437
  • Red Hat OpenShift Container Platform 4.8 podman 3.0.1-6.el8, haproxy 2.2.13-1.el7, haproxy 2.2.13-1.el8, ostree 2020.7-5.el8_4, cri-tools 1.21.0-2.el7, cri-tools 1.21.0-2.el8, +133 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.01% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:P/I:N/A:N
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.jenkins-ci.plugins:matrix-auth
<2.6.6
2.6.6

Affected products

  • Jenkins project Jenkins Matrix Authorization Strategy Plugin

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.