CVE-2023-33969Public exploitNetwork attack vector

Authenticated JavaScript execution via unescaped external-link URL

Published Jun 5, 2023 · Updated Jan 8, 2025

Stored XSS in Kanboard 1.2.29 and earlier allows remote authenticated users to execute JavaScript when a user views a malicious task. The task external-link table and board-tooltip templates place the stored link URL directly in an href attribute without HTML escaping. Exploitation requires permission to add or edit a task link and a viewer; the default CSP blocks JavaScript, while a permissive CSP exposes the viewer's Kanboard session and actions.

CVSS severity6.4
Medium
EPSS probability0.51%
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 Kanboard 1.2.29 and earlier allows remote authenticated users to execute JavaScript when a user views a malicious task. The task external-link table and board-tooltip templates place the stored link URL directly in an href attribute without HTML escaping. Exploitation requires permission to add or edit a task link and a viewer; the default CSP blocks JavaScript, while a permissive CSP exposes the viewer's Kanboard session and actions.

The record

CVE
CVE-2023-33969
Published
Jun 5, 2023
Updated
Jan 8, 2025
Vendor
Kanboard
Product
Kanboard
Classifications
CWE-79, CWE-80, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 1.2.30

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kanboard · Kanboardversion=< 1.2.30

Published CVSS scores

5.4NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.4GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

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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