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MediumFix available

Gitea container registry stored XSS through blob media type

Type: advisorySources: OSV

Gitea's container registry served blob downloads with a `Content-Type` taken from the media type declared in pushed image manifests, without a `Content-Disposition` or restrictive content security policy. A user who can push container images can publish a blob containing HTML and JavaScript with a `text/html` media type. When a victim who is authenticated to the instance opens the blob URL in a browser, the script runs on the Gitea origin and can perform actions as the victim, such as creating API tokens.

Products
gitea
Affected versions
Not specified
Fixed versions
28.0.0
CVEs
CVE-2026-103667
Confirmed fixed CVEs
Not specified
Updated in this feed
30 Oct 2026, 20:02 UTC · Revision 1

Source evidence

Gitea container registry stored XSS through blob media type

core-osv · Original source

Published 16 Oct 2026, 08:36 UTC

Gitea's container registry served blob downloads with a `Content-Type` taken from the media type declared in pushed image manifests, without a `Content-Disposition` or restrictive content security policy. A user who can push container images can publish a blob containing HTML and JavaScript with a `text/html` media type. When a victim who is authenticated to the instance opens the blob URL in a browser, the script runs on the Gitea origin and can perform actions as the victim, such as creating API tokens.

osv:BIT-gitea-2026-103667

gitea

Fixed versions: 28.0.0

Complete source record
{
  "id": "cbfecccb495ee70f624e8e9849332570a36a8ed3f16f05454055cc9d8787334b",
  "url": "https://osv.dev/vulnerability/BIT-gitea-2026-103667",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Gitea container registry stored XSS through blob media type",
    "summary": "Gitea's container registry served blob downloads with a `Content-Type` taken from the media type declared in pushed image manifests, without a `Content-Disposition` or restrictive content security policy. A user who can push container images can publish a blob containing HTML and JavaScript with a `text/html` media type. When a victim who is authenticated to the instance opens the blob URL in a browser, the script runs on the Gitea origin and can perform actions as the victim, such as creating API tokens.",
    "evidence": "osv:BIT-gitea-2026-103667",
    "products": [
      {
        "name": {
          "value": "gitea",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "28.0.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "BIT-gitea-2026-103667",
      "aliases": [
        "BIT-gitea-2026-103667",
        "CVE-2026-103667",
        "GHSA-7cq7-4v93-8wjm"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "28.0.0"
                }
              ]
            }
          ],
          "package": {
            "name": "gitea",
            "purl": "pkg:bitnami/gitea",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V3",
              "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/gitea/BIT-gitea-2026-103667.json"
          }
        }
      ],
      "modified": "2026-10-16T09:56:02.327567064Z",
      "provider": "osv",
      "references": [
        "https://blog.gitea.com/release-of-28.0.0/",
        "https://github.com/go-gitea/gitea/pull/39398",
        "https://github.com/go-gitea/gitea/releases/tag/v28.0.0",
        "https://github.com/go-gitea/gitea/security/advisories/GHSA-7cq7-4v93-8wjm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-103667"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:gitea:gitea:*:*:*:*:*:*:*:*"
        ],
        "severity": "Medium"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-103667",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 338740,
  "published_at": "2026-10-16T08:36:30.182+00:00"
}