How severe is CVE-2021-21649?

CVE-2021-21649 has a CVSS score of 5.4/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-21649?

CVE-2021-21649 affects the following packages: org.jenkins-ci.plugins:dashboard-view (Maven), org.jenkins-ci.plugins:dashboard-view (Maven). Ecosystems affected: Maven.

How do I fix CVE-2021-21649?

Update org.jenkins-ci.plugins:dashboard-view to 2.16 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21649 is resolved across your whole dependency graph.

How do I detect CVE-2021-21649 in my Maven dependencies?

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

How do I mitigate CVE-2021-21649 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2021-21649 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-21649 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-2021-21649?

CVE-2021-21649 has an EPSS (Exploit Prediction Scoring System) score of 72.7%, placing it in the 99th 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. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2021-21649?

CVE-2021-21649 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2021-21649 published, and has it been updated?

CVE-2021-21649 was published on May 11, 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-2021-21649 — dashboard-view

MEDIUMFix: jenkinsci/dashboard-view-plugin@586817b

CVE-2021-21649 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in org.jenkins-ci.plugins:dashboard-view. EPSS puts its 30-day exploitation probability at 72.7% (99th percentile). A fix is available for org.jenkins-ci.plugins:dashboard-view — see the affected versions and patch details below.

Cross-site Scripting in Jenkins Dashboard View Plugin

Also known asGHSA-jwhm-9cjm-4493

Published

May 11, 2021

Updated

Oct 24, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

72.7%probability of exploitation in next 30 days

Very High Risk0.00%

Lower risk than most CVEs99th percentile — riskier than 99% 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

2 pkgs affected

☕org.jenkins-ci.plugins:dashboard-view☕org.jenkins-ci.plugins:dashboard-view

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

As part of this fix, the property for image URLs was changed from url to imageUrl. Existing Configuration as Code configurations are still supported, but exports will emit the new property.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.jenkins-ci.plugins:dashboard-view`	≥ 2.13&&< 2.16	2.16`org.jenkins-ci.plugins:dashboard-view:2.16`
☕Maven	`org.jenkins-ci.plugins:dashboard-view`	all versions	2.12.1`org.jenkins-ci.plugins:dashboard-view:2.12.1`

Affected Products

1 product · 1 configurations

Application

dashboard viewjenkins

≤ 2.15

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:dashboard-view, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.jenkins-ci.plugins:dashboard-view to 2.16 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21649 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Jenkins Dashboard View Plugin prior to 2.16 and 2.12.1 does not escape URLs referenced in Image Dashboard Portlets, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with View/Configure permission. As part of this fix, the property for image URLs was changed from `url` to `imageUrl`. Existing [Configuration as Code](https://plugins.jenkins.io/configuration-as-code/) configurations are still supported, but exports will emit the new property.

O3 Security · Impact-Aware SCA

Is CVE-2021-21649 in your dependencies?

Find it across Maven, including transitive dependencies.

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CVSS Score

5.4/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

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

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

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

Timeline

Disclosed

May 11, 2021

Last updated

Oct 24, 2026

Identifiers

CVE-2021-21649

GHSA-jwhm-9cjm-4493

References

Advisoryjenkins.io · 2021 05 11 Advisorynvd.nist.gov · CVE 2021 21649 Webgithub.com · 586817b081d903e47cfdd05b96b8aae1d2c2700b Webgithub.com · CVE 2021 21649.json Packagegithub.com · dashboard view plugin

Related vulnerabilities

Also affects dashboard-view

This CVE is medium severity, in line with the other 2 CVEs affecting dashboard-view.

CVE-2019-10396CVE-2022-27197

Same weakness: CWE-79

This CVE is medium severity; 6 of 6 other CVEs with CWE-79 are rated as high or higher (top: critical).

CVE-2026-88986CVE-2026-63197CVE-2026-55649CVE-2026-113787CVE-2026-44267CVE-2026-96632Browse all CWE-79

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026