What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-24 · updated 2026-06-25
• Weakness: CWE-79

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 products

• gogs: before 0.14.3

References

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

Get alerted when CVE-2026-52798 or the next vulnerability affects your stack