How severe is CVE-2021-21626?

CVE-2021-21626 has a CVSS score of 4.3/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-21626?

CVE-2021-21626 affects the following packages: io.jenkins.plugins:warnings-ng (Maven). Ecosystems affected: Maven.

How do I fix CVE-2021-21626?

Update io.jenkins.plugins:warnings-ng to 8.5.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21626 is resolved across your whole dependency graph.

How do I detect CVE-2021-21626 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for io.jenkins.plugins:warnings-ng, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-21626 if there is no patch (or I can't update yet)?

Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Is CVE-2021-21626 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-21626 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-21626?

CVE-2021-21626 has an EPSS (Exploit Prediction Scoring System) score of 0.9%, placing it in the 58th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-21626?

CVE-2021-21626 is classified as CWE-862 (CWE-862). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2021-21626 published, and has it been updated?

CVE-2021-21626 was published on March 18, 2021 and was last updated on October 24, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2021-21626 — warnings-ng

MEDIUM

CVE-2021-21626 is a medium-severity (CVSS 4.3) CWE-862 vulnerability in io.jenkins.plugins:warnings-ng. A fix is available for io.jenkins.plugins:warnings-ng — see the affected versions and patch details below.

Missing permission checks in Jenkins Warnings Next Generation Plugin allow listing workspace contents

Also known asGHSA-7j3x-xm4j-jfj7

Published

Mar 18, 2021

Updated

Oct 24, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs58th percentile — riskier than 58% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

☕io.jenkins.plugins:warnings-ng

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Jenkins Warnings Next Generation Plugin 8.4.4 and earlier does not perform permission checks in methods implementing form validation.

This allows attackers with Item/Read permission but without Item/Workspace or Item/Configure permission to check whether attacker-specified file patterns match workspace contents. A sequence of requests can be used to effectively list workspace contents.

Jenkins Warnings Next Generation Plugin 8.5.0 requires Item/Configure permission to validate patterns with workspace contents.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`io.jenkins.plugins:warnings-ng`	all versions	8.5.0`io.jenkins.plugins:warnings-ng:8.5.0`

Affected Products

1 product · 1 configurations

Application

warnings next generationjenkins

≤ 8.4.4

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for io.jenkins.plugins:warnings-ng, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update io.jenkins.plugins:warnings-ng to 8.5.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21626 is resolved across your whole dependency graph.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

Jenkins Warnings Next Generation Plugin 8.4.4 and earlier does not perform permission checks in methods implementing form validation. This allows attackers with Item/Read permission but without Item/Workspace or Item/Configure permission to check whether attacker-specified file patterns match workspace contents. A sequence of requests can be used to effectively list workspace contents. Jenkins Warnings Next Generation Plugin 8.5.0 requires Item/Configure permission to validate patterns with workspace contents.

O3 Security · Impact-Aware SCA

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Find it across Maven, including transitive dependencies.

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CVSS Score

4.3/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Raw vector

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

CWE Classification

CWE-862CWE-862

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

warnings-ng-plugin

6.4/10

Maintained10/10

Code-Review6/10

Branch-Protection0/10

Assessed Oct 26, 2026

Timeline

Disclosed

Mar 18, 2021

Last updated

Oct 24, 2026

Identifiers

CVE-2021-21626

GHSA-7j3x-xm4j-jfj7

References

Advisoryopenwall.com Advisoryjenkins.io · 2021 03 18 Advisorynvd.nist.gov · CVE 2021 21626 Packagegithub.com · warnings ng plugin

Related vulnerabilities

Also affects warnings-ng

This CVE is medium severity; 6 of 6 other CVEs affecting warnings-ng are rated as high or higher (top: high).

CVE-2023-46651CVE-2019-10326CVE-2019-10325CVE-2019-1003023CVE-2019-1003008CVE-2022-23107

Same weakness: CWE-862

This CVE is medium severity; 2 of 2 other CVEs with CWE-862 are rated as high or higher (top: critical).

GHSA-47w9-6r3f-938gCVE-2026-16454Browse all CWE-862

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026

CVE-2021-21626 — warnings-ng

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2021-21626 in your dependencies?