CVE-2026-52816

published 2026-06-24

CVE-2026-52816: Gogs is an open source self-hosted Git service. Prior to 0.14.3, the Jupyter Notebook (ipynb) sanitizer endpoint at POST /-/api/sanitize_ipynb allows arbitrary…

Priority P4 33 medium 5.4 CVSS 4.0

AV N AC L AT N PR N UI P VC N VI N VA N SC H SI H SA N E P CR X IR X AR X MAV X MAC X MAT X MPR X MUI X MVC X MVI X MVA X MSC X MSI X MSA X S X AU X R X V X RE X U X

Gogs is an open source self-hosted Git service. Prior to 0.14.3, the Jupyter Notebook (ipynb) sanitizer endpoint at POST /-/api/sanitize_ipynb allows arbitrary data: URIs without proper restrictions, potentially leading to Cross-Site Scripting (XSS). The endpoint uses bluemonday.UGCPolicy() with p.AllowURLSchemes("data") which permits all data URI schemes including data:text/html, enabling attackers to inject malicious HTML/JavaScript. Additionally, the endpoint has no authentication middleware, allowing any registered user to exploit this vulnerability. This vulnerability is fixed in 0.14.3.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
gogs.io	gogs	>= 0 < 0.14.3	0.14.3
gogs	gogs	< 0.14.3	0.14.3

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CWE-80 CWE-79