CVE-2026-52816mediumCWE-80

CVE-2026-52816: medium-severity vulnerability in gogs

Gogs: Unauthenticated Jupyter Notebook (ipynb) Sanitizer allows arbitrary data: URIs leading to XSS

Published · Updated

Follow this CVE+ Monitor gogs+ Monitor gogs.io/gogs

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.4epss 0.7%
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.
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
Affected products
gogs · gogs
Related CVEs — gogs

In the same product, most dangerous first.

CVE-2024-55947HIGHGogs has a Path Traversal in file update APIEPSS 77.7%CVE-2022-32174CRITICALGogs - XSSEPSS 58.2%CVE-2026-52806CRITICALGogs: RCE via git rebase --exec argument injection in pull request mergeEPSS 7.9%CVE-2026-52815MEDIUMGogs: Unauthenticated Organization Teams Information Disclosure via APIEPSS 1.5%CVE-2025-64111CRITICALGogs's update .git/config file allows remote command executionEPSS 1.4%CVE-2024-56731CRITICALGogs deletion of internal files allows remote command executionEPSS 1.1%