TI-2026-37925 Aliases CVE-2026-52816 GHSA-3w28-36p9-w929

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

MEDIUM 58CWE-80Published 2026-06-24 · Updated 2026-06-25

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: None · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-80.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00677 52nd percentileScored 2026-11-07

Fix Fixed gogs (gogs): 0.14.3gogs.io/gogs (Go): 0.14.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Gogs	gogs	before 0.14.3	0.14.3	Patch available	CNA
—	gogs.io/gogs (Go)	before 0.14.3	0.14.3	Patch available	GHSA-3w28-36p9-w929

gogs VendorGogs Affected before 0.14.3 Fixed in 0.14.3 Patch available CNA
gogs.io/gogs (Go) Vendor— Affected before 0.14.3 Fixed in 0.14.3 Patch available GHSA-3w28-36p9-w929

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:gogs:gogs::::::::	—	—	Gogs

cpe:2.3:a:gogs:gogs:*:*:*:*:*:*:*:* Versions — — ·Gogs

Remediation

Fix · CNA gogs (gogs) Fixed in 0.14.3
Fix · GHSA-3w28-36p9-w929 gogs.io/gogs (Go) Fixed in 0.14.3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-52816
2026-10-03 Alias added: GHSA-3w28-36p9-w929

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-52816

Other 5

TI-2025-07419 File overwrite in file update API in Gogs KEVCVSS 4.0HIGH 8.7
TI-2022-01876 OS Command Injection in gogs/gogs CVSS 3.1CRITICAL 9.8
TI-2024-36988 Gogs has a Path Traversal in file update API CVSS 4.0HIGH 8.7
TI-2026-37922 Gogs: Path Traversal in organization name results in RCE through Git hooks CVSS 3.1CRITICAL 10.0
TI-2022-01744 Remote Command Execution in gogs/gogs CVSS 3.1CRITICAL 10.0
TI-2025-39562 Gogs's update .git/config file allows remote command execution CVSS 4.0CRITICAL 9.3

See all 75 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences