CVE-2026-52816 Details
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.
A stored cross-site scripting vulnerability has been identified in Gogs, an open-source self-hosted Git service, in versions prior to 0.14.3. The issue arises in the Jupyter Notebook (.ipynb) sanitizer endpoint, specifically at POST /-/api/sanitize_ipynb. This endpoint allows arbitrary data URIs without proper restrictions, enabling the injection of malicious HTML or JavaScript. The vulnerability is exacerbated by the absence of authentication middleware on the endpoint, allowing any registered user to exploit it.
Users can update to Gogs version 0.14.3 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 24, 2026CISA-ADP
Assessed Jun 25, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/gogs/gogs/security/advisories/GHSA-3w28-36p9-w929 | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/gogs/gogs/commit/dd1bd9837aa196b3ed3a8ee21e5727b5d7a986a3 | [email protected] | Source CodeVendor |
| https://github.com/gogs/gogs/pull/8326 | [email protected] | Issue TrackingVendor |
| https://github.com/gogs/gogs/releases/tag/v0.14.3 | [email protected] | Release NotesVendor |
| https://github.com/gogs/gogs/security/advisories/GHSA-3w28-36p9-w929 | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-80 | Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Gogs | < 0.14.3 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 25, 2026 | CVE Modified | CISA-ADP |
| Jun 24, 2026 | New CVE Received | [email protected] |