Vulnerability · Published Jun 24, 2026 · Assigned by GitHub_M

CVE-2026-52798Gogs: Stored XSS in `.ipynb` Preview

High 8.9

In plain English

A high-severity cross-site scripting in gogs from gogs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.9High

Exploit odds (30 days)0.4%top 62.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Gogs is an open source self-hosted Git service. Prior to 0.14.3, although .ipynb previews are sanitized on the server side via /-/api/sanitize_ipynb, the inserted content is re-rendered on the client side without sanitization using marked() on elements with the .nb-markdown-cell class. During this process, links containing schemes such as javascript: can be regenerated. As a result, when a victim views an attacker-crafted .ipynb file and clicks the link, arbitrary JavaScript is executed in the Gogs origin, leading to a click-based Stored XSS. This vulnerability is fixed in 0.14.3.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	gogs.io/gogs	0.14.3	GHSA-jq8v-rmf6-65jw
Go	gogs.io/gogs	no fix listed	GO-2026-5477

Affected products (as reported)

Vendor	Product	Versions
gogs	gogs	< 0.14.3

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

References

https://github.com/gogs/gogs/security/advisories/GHSA-jq8v-rmf6-65jw x_refsource_CONFIRM
https://github.com/gogs/gogs/pull/8319 x_refsource_MISC
https://github.com/gogs/gogs/commit/17b168b11ca759a7550e1f4bbd68bbde14db7785 x_refsource_MISC
https://github.com/gogs/gogs/releases/tag/v0.14.3 x_refsource_MISC