CVE-2026-104976

Description

Plane is an open-source project management tool. Prior to 1.4.0, Plane validates GITEA_HOST only for its URL scheme and does not reject hosts that resolve to private or internal IP addresses. The four outbound requests in the Gitea OAuth flow are derived from this unvalidated host and do not call validate_url(). In addition, avatar_url is taken from the Gitea user's profile, where users can configure external avatar URLs. After an administrator enables Gitea OAuth for a legitimate instance, a Gitea user can set an internal URL as the profile avatar and log in through Gitea, causing Plane to fetch the internal target without validation. This issue is fixed in 1.4.0.

References

https://github.com/makeplane/plane/security/advisories/GHSA-hx79-5pj5-qh42

https://github.com/makeplane/plane/releases/tag/v1.4.0

https://github.com/makeplane/plane/pull/9163

https://github.com/makeplane/plane/commit/04622ce1188c4680951f0001e35efb342fe51615

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-92533

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS