CVE-2021-25967Network attack vector

Stored script execution via unrestricted SVG upload

Published Dec 1, 2021 · Updated Apr 30, 2025

Stored XSS in CKAN 2.9.0 through 2.9.3 allows remote authenticated users to execute scripts in a victim's browser via an SVG profile image. The user profile image uploader accepts SVG content without restricting its actual MIME type, stores the file, and serves embedded scripts when the image is opened. Low-privileged application access is sufficient to plant the image, but a victim must open it; script execution is limited to the victim's browser context.

CVSS severity5.4
Medium
EPSS probability0.49%
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 CKAN 2.9.0 through 2.9.3 allows remote authenticated users to execute scripts in a victim's browser via an SVG profile image. The user profile image uploader accepts SVG content without restricting its actual MIME type, stores the file, and serves embedded scripts when the image is opened. Low-privileged application access is sufficient to plant the image, but a victim must open it; script execution is limited to the victim's browser context.

The record

CVE
CVE-2021-25967
Published
Dec 1, 2021
Updated
Apr 30, 2025
Vendor
CKAN
Product
CKAN
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2025Record 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=2.9.0 <unspecified
  2. Affected versionversion=unspecified <=2.9.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CKAN · CKANversion=2.9.0 <unspecified; version=unspecified <=2.9.3

Published CVSS scores

5.1GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
5.4MendCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/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')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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