CVE-2026-42521 Vulnerability Analysis & Exploit Details

CVE-2026-42521
Vulnerability Scoring

6.5
/10
High Risk

If left unpatched, CVE-2026-42521 could lead to major system disruptions or data loss.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-42521 Details

Status: Analyzed

Last updated: 🕓 06 May 2026, 16:21 UTC
Originally published on: 🕑 29 Apr 2026, 14:16 UTC

Time between publication and last update: 7 days

CVSS Release: version 3

CVSS3 Source

134c704f-9b21-4f2e-91b3-4a467353bcc0

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2026-42521 Vulnerability Summary

CVE-2026-42521: 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, allowing 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.

Assessing the Risk of CVE-2026-42521

Access Complexity Graph

The exploitability of CVE-2026-42521 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-42521

CVE-2026-42521 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-42521, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-42521, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2026-42521 has no significant impact on data confidentiality.
  • Integrity: High
    CVE-2026-42521 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: None
    CVE-2026-42521 does not impact system availability.

CVE-2026-42521 References

External References

CWE Common Weakness Enumeration

CWE-502

CAPEC Common Attack Pattern Enumeration and Classification

  • Object Injection CAPEC-586 An adversary attempts to exploit an application by injecting additional, malicious content during its processing of serialized objects. Developers leverage serialization in order to convert data or state into a static, binary format for saving to disk or transferring over a network. These objects are then deserialized when needed to recover the data/state. By injecting a malformed object into a vulnerable application, an adversary can potentially compromise the application by manipulating the deserialization process. This can result in a number of unwanted outcomes, including remote code execution.

Vulnerable Configurations

  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.1:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.1:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.1.1:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.1.1:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.2:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.2:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.3:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.3:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.4:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.4:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.4.1:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.4.1:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.4.2:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.4.2:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.5:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.5:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.5.1:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.5.1:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.5.2:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.5.2:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.1:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.1:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.2:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.2:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.3:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.3:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.3.1:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.3.1:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.4:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.4:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.5:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.5:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.6:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.6:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.7:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.7:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.8:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.8:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.9:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.9:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.11:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.6.11:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.0:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.0:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.0.1:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.0.1:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.1:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.1:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.2:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.2:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.3:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.3:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.4:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.4:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.5:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.5:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.6:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.6:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.7:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.7:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.8:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.8:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.9:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.9:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.10:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.1.10:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.1:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.1:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.2:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.2:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.3:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.3:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.4:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.4:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.5:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.5:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.6:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.6:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.7:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.7:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.8:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.8:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.9:*:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:3.2.9:*:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.0:beta1:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.0:beta1:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.0:beta2:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.0:beta2:*:*:*:jenkins:*:*
  • cpe:2.3:a:jenkins:matrix_authorization_strategy:2.0:beta3:*:*:*:jenkins:*:*
    cpe:2.3:a:jenkins:matrix_authorization_strategy:2.0:beta3:*:*:*:jenkins:*:*

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