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CVE-2026-52816

MEDIUM
5.4
CVSS 4.0
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.

Metadata

CVE ID
CVE-2026-52816
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-08 18:11 UTC
Published
2026-06-24 20:26 UTC
Last updated
2026-06-24 20:26 UTC
Primary CWE
CWE-80
CWE-80: Improper Neutralization of Script-Related HTML Tags …
Vendor / Product
gogs / gogs
Sources
cve.org  ·  NVD

Severity & Metrics

5.4 MEDIUM CVSS 4.0
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 (1)
VendorProductPlatformVersions
gogs gogs — < 0.14.3
Weakness (CWE)
CWESourceDescription
CWE-80 cna CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.4 MEDIUM 4.0 cna 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
References (4)
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