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CVE-2026-42521VulnerabilityPublished Updated

Org.jenkins ci.plugins:matrix auth: Jenkins Matrix Authorization Strategy Plugin: Unsafe deserialization allows

Affects org.jenkins-ci.plugins:matrix-authSource GCVE Database

0
Authoritative record:CVE-2026-42521· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium : upgrade to 3.2.10 when convenient.

Data as of 27 Oct 2026, 00:07 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 3.2.10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade org.jenkins-ci.plugins:matrix-auth to 3.2.10.

Affected software

ProductAffectedFixed in
Mavenorg.jenkins-ci.plugins:matrix-authAffected
  • >=2.0-beta-1 <3.2.10
Fixed in
  • 3.2.10

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

Jenkins Matrix Authorization Strategy Plugin 2.0-beta-1 through 3.2.9 (both inclusive) invokes parameterless constructors of classes specified in configuration when deserializing inheritance strategies, without restricting the classes that can be instantiated. This can be abused by attackers with Item/Configure permission to instantiate arbitrary types, which may lead to information disclosure or other impacts depending on the classes available on the classpath. Matrix Authorization Strategy Plugin 3.2.10 verifies that the class being instantiated is an inheritance strategy implementation, preventing instantiation of arbitrary types.

References

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