CVE-2026-42521 (GCVE-0-2026-42521)
Vulnerability from cvelistv5 – Published: 2026-04-29 13:31 – Updated: 2026-04-29 13:58
VLAI?
Summary
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.
Severity ?
6.5 (Medium)
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Jenkins Project | Jenkins Matrix Authorization Strategy Plugin |
Affected:
2.0-beta-1 , ≤ 3.2.9
(maven)
|
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
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"timestamp": "2026-04-29T13:58:15.842577Z",
"version": "2.0.3"
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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"defaultStatus": "unaffected",
"product": "Jenkins Matrix Authorization Strategy Plugin",
"vendor": "Jenkins Project",
"versions": [
{
"lessThanOrEqual": "3.2.9",
"status": "affected",
"version": "2.0-beta-1",
"versionType": "maven"
}
]
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],
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}
],
"providerMetadata": {
"dateUpdated": "2026-04-29T13:31:30.608Z",
"orgId": "39769cd5-e6e2-4dc8-927e-97b3aa056f5b",
"shortName": "jenkins"
},
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],
"url": "https://www.jenkins.io/security/advisory/2026-04-29/#SECURITY-3676"
}
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}
},
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"dateReserved": "2026-04-28T09:24:35.048Z",
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"state": "PUBLISHED"
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"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-42521",
"date": "2026-05-04",
"epss": "0.00036",
"percentile": "0.10612"
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"vulnrichment": {
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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