Vulnerability Description
Hubzilla 11.2.1 contains a cross-site request forgery vulnerability in the OAuth2 /authorize endpoint handled by Zotlabs\Module\Authorize::post() that allows unauthenticated attackers to register arbitrary OAuth2 applications under an authenticated user's account by submitting a cross-origin POST request without CSRF token or Origin/Referer validation. Attackers can craft a malicious HTML form that autosubmits attacker-chosen OAuth2 parameters including client_id, client_secret, redirect_uri, and scope to silently register a persistent OAuth2 application, enabling interception of future OAuth2 authorization codes when the victim later authenticates against the attacker-controlled client.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://framagit.org/hubzilla/core
- https://framagit.org/hubzilla/core/-/blob/dev/Zotlabs/Module/Authorize.php?ref_t
- https://hub.volse.no/cloud/harald/Skjermopptak_20260616_095037.webm
- https://www.vulncheck.com/advisories/hubzilla-csrf-via-oauth2-authorize-endpoint
- https://hub.volse.no/cloud/harald/Skjermopptak_20260616_095037.webm
FAQ
What is CVE-2026-70556?
CVE-2026-70556 is a vulnerability with a CVSS score of 4.3 (MEDIUM). Hubzilla 11.2.1 contains a cross-site request forgery vulnerability in the OAuth2 /authorize endpoint handled by Zotlabs\Module\Authorize::post() that allows unauthenticated attackers to register arbi...
How severe is CVE-2026-70556?
CVE-2026-70556 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-70556?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.