Gogs: Stored XSS in `.ipynb` Preview

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Summary

CVECVE-2026-52798
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 21:16:55 UTC
Updated2026-06-24 21:16:55 UTC
DescriptionGogs 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.

Risk And Classification

Primary CVSS: v3.1 8.9 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.9HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
3.1CNADECLARED8.9HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gogs Gogs affected < 0.14.3 Not specified

References

ReferenceSourceLinkTags
github.com/gogs/gogs/commit/17b168b11ca759a7550e1f4bbd68bbde14db7785 [email protected] github.com
github.com/gogs/gogs/pull/8319 [email protected] github.com
github.com/gogs/gogs/security/advisories/GHSA-jq8v-rmf6-65jw [email protected] github.com
github.com/gogs/gogs/releases/tag/v0.14.3 [email protected] github.com
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