What’s Vulnerable › Vulnerabilities

CVE-2023-33969: Stored Cross site scripting in the Task External Link Functionality in Kanboard

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-06-05 · updated 2026-06-17
• Weakness: CWE-79

Description

Kanboard is open source project management software that focuses on the Kanban methodology. A stored Cross site scripting (XSS) allows an attacker to execute arbitrary Javascript and any user who views the task containing the malicious code will be exposed to the XSS attack. Note: The default CSP header configuration blocks this javascript attack. This issue has been addressed in version 1.2.30. Users are advised to upgrade. Users unable to upgrade should ensure that they have a restrictive CSP header config.

Affected products

• kanboard: before 1.2.30 — fixed in 1.2.30

How to fix

Upgrade to a fixed version: kanboard 1.2.30. Check the vendor advisory for mitigations.

References

• https://github.com/kanboard/kanboard/commit/05f1d23d821152cd61536d3b09e522c0f7573e3c
• https://github.com/kanboard/kanboard/security/advisories/GHSA-8qvf-9847-gpc9
• https://github.com/kanboard/kanboard/commit/05f1d23d821152cd61536d3b09e522c0f7573e3c
• https://github.com/kanboard/kanboard/security/advisories/GHSA-8qvf-9847-gpc9

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