CVE-2021-21649Network attack vector

Stored XSS via unescaped image portlet URLs

Published May 11, 2021 · Updated Aug 3, 2024

Stored XSS in Jenkins Dashboard View Plugin 2.15 and earlier allows remote authenticated users to execute script via image URLs. The Image Dashboard Portlet stores a configured URL and renders it without escaping or rejecting unsafe values, allowing browser interpretation as active content. View/Configure permission is required to plant the URL, and execution occurs when another user opens the affected dashboard view.

CVSS severity5.4
Medium
EPSS probability72.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Jenkins Dashboard View Plugin 2.15 and earlier allows remote authenticated users to execute script via image URLs. The Image Dashboard Portlet stores a configured URL and renders it without escaping or rejecting unsafe values, allowing browser interpretation as active content. View/Configure permission is required to plant the URL, and execution occurs when another user opens the affected dashboard view.

The record

CVE
CVE-2021-21649
Published
May 11, 2021
Updated
Aug 3, 2024
Vendor
Jenkins Project
Product
Jenkins Dashboard View Plugin
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=2.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · Jenkins Dashboard View Pluginversion=unspecified <=2.15

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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