CVE-2026-52816

Medium

Description

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.

SeverityMedium

CVSS5.4

Exploit probability—

ProductGogs.io/gogs

PublishedJun 24, 2026

First seenJun 24, 2026

Weakness typeCWE-80CWE-80

How to fix

Update

gogs.io/gogs0.14.3 or later

Affected products

Product	Affected versions	Fixed in
gogs.io/gogsGo	v < 0.14.3, No range specified	0.14.3

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