CVE-2026-52816

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

Published: Jun 24, 2026Updated: Jun 25, 2026 Sources: CVE List NVDCWE-80

N/ACVSS

NVD MITRE

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.

No summary for this CVE yet.

Weaknesses

CWE-80

Affected Products

gogs

oss-projectaka gogs/gogs

gogsOn-prem

DevTools & CI / ci-cd

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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References

https://github.com/gogs/gogs/security/advisories/GHSA-3w28-36p9-w929

github.com

https://github.com/gogs/gogs/pull/8326

github.com

https://github.com/gogs/gogs/commit/dd1bd9837aa196b3ed3a8ee21e5727b5d7a986a3

github.com

and 1 more references View all →

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