CVE-2026-52807 (GCVE-0-2026-52807)

Vulnerability from cvelistv5 – Published: 2026-06-24 20:25 – Updated: 2026-06-24 20:25
VLAI
Title
Gogs: DOM-based XSS via Milestone Name on New Issue Page
Summary
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 &lt; 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.
Severity
4.8 (Medium)
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
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version
gogs gogs Affected: < 0.14.3
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "gogs",
          "vendor": "gogs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.14.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Gogs is an open source self-hosted Git service. Prior to 0.14.3, in new_form.tmpl, milestone names are rendered with Go\u0027s default auto-escaping ({{.Name}}), which converts \u003c to \u0026lt; 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\u0027s dropdown component has preserveHTML: true as the default setting. When a user selects a dropdown item, the internal set.text() method calls jQuery\u0027s .html() with the item\u0027s 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\u0027s preserveHTML behavior. This vulnerability is fixed in 0.14.3."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "ACTIVE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T20:25:49.230Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/gogs/gogs/security/advisories/GHSA-vcm5-gvmp-78mp",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/gogs/gogs/security/advisories/GHSA-vcm5-gvmp-78mp"
        },
        {
          "name": "https://github.com/gogs/gogs/pull/8325",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gogs/gogs/pull/8325"
        },
        {
          "name": "https://github.com/gogs/gogs/commit/573eacdc658641487f8ad883da96b29ec8e2852d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gogs/gogs/commit/573eacdc658641487f8ad883da96b29ec8e2852d"
        },
        {
          "name": "https://github.com/gogs/gogs/releases/tag/v0.14.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gogs/gogs/releases/tag/v0.14.3"
        }
      ],
      "source": {
        "advisory": "GHSA-vcm5-gvmp-78mp",
        "discovery": "UNKNOWN"
      },
      "title": "Gogs: DOM-based XSS via Milestone Name on New Issue Page"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-52807",
    "datePublished": "2026-06-24T20:25:49.230Z",
    "dateReserved": "2026-06-08T18:02:19.731Z",
    "dateUpdated": "2026-06-24T20:25:49.230Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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