CVE-2026-103667: XSS

Description

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.

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Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

References

Other 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

Frequently Asked Questions

What is CVE-2026-103667? +

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.

How do I check if I'm vulnerable to CVE-2026-103667? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-103667