Vulnerability · Published Jun 24, 2026 · Assigned by GitHub_M

CVE-2026-52807Gogs: DOM-based XSS via Milestone Name on New Issue Page

Medium 4.8

In plain English

A medium-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 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)4.8Medium

Exploit odds (30 days)0.5%top 58.2% 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, in new_form.tmpl, milestone names are rendered with Go's default auto-escaping ({{.Name}}), which converts < to < etc. This prevents direct HTML injection. However, when the browser renders the DOM, the text content of the element contains the decoded original payload. Semantic UI 2.4.2's dropdown component has preserveHTML: true as the default setting. When a user selects a dropdown item, the internal set.text() method calls jQuery's .html() with the item's text content. This re-parses the decoded text as HTML, creating the injected element and triggering the JavaScript event handler. An attacker can store an HTML/JavaScript payload in a milestone name, and when any user opens the New Issue page and interacts with the milestone dropdown, the payload executes in their browser via Semantic UI's preserveHTML behavior. 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-vcm5-gvmp-78mp
Go	gogs.io/gogs	no fix listed	GO-2026-5661

Affected products (as reported)

Vendor	Product	Versions
gogs	gogs	< 0.14.3

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

References

https://github.com/gogs/gogs/security/advisories/GHSA-vcm5-gvmp-78mp x_refsource_CONFIRM
https://github.com/gogs/gogs/pull/8325 x_refsource_MISC
https://github.com/gogs/gogs/commit/573eacdc658641487f8ad883da96b29ec8e2852d x_refsource_MISC
https://github.com/gogs/gogs/releases/tag/v0.14.3 x_refsource_MISC