CVE-2026-105630: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in makeplane plane
Description
Plane is an open-source project management tool. Prior to 1.4.0, an authenticated low-privilege workspace member, including a Guest, can upload an image/svg+xml file as a generic or issue attachment. The file retains the attacker-controlled Content-Type, and the asset-download endpoint creates a presigned URL with Content-Disposition: inline. In the default self-hosted MinIO deployment, the asset URL is served from the same origin as the Plane application, allowing embedded SVG JavaScript to execute in the application's security context. A victim, including a workspace administrator, who opens the link can have the session compromised through stored XSS, leading to account takeover. This issue is fixed in 1.4.0.
CVSS v3.1
Score 8.7high
Affected software
makeplane
plane
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-105630 describes a stored cross-site scripting vulnerability in Plane versions before 1.4.0. The issue arises because low-privilege authenticated users can upload image/svg+xml files as attachments, which retain the attacker-controlled Content-Type. The asset-download endpoint generates a presigned URL with Content-Disposition set to inline, and in the default self-hosted MinIO deployment, the asset URL is served from the same origin as the Plane application. This allows embedded SVG JavaScript to execute within the application's security context. A victim user, including workspace administrators, who opens the malicious link can have their session compromised, leading to account takeover. The vulnerability is resolved in Plane 1.4.0.
Potential Impact
Successful exploitation allows an attacker with low privileges to execute arbitrary JavaScript in the context of the Plane application for other users, including administrators. This can lead to session compromise and account takeover. The vulnerability does not impact availability but has high confidentiality and integrity impacts as per the CVSS score of 8.7.
Mitigation Recommendations
This vulnerability is fixed in Plane version 1.4.0. Users should upgrade to version 1.4.0 or later to remediate this issue. No additional mitigation is required if the upgrade is applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-05T16:40:39.611Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac3e69c2cdf04f65628b474
Added to database: 10/05/2026, 18:04:12 UTC
Last enriched: 10/05/2026, 18:19:27 UTC
Last updated: 10/05/2026, 19:04:09 UTC
Views: 9
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