CVE-2026-70556 Hubzilla version prior to 11.4 CSRF via OAuth2 /authorize Endpoint App Registration
Attackers can exploit CSRF in Hubzilla to register malicious OAuth2 apps, potentially intercepting authorization codes and compromising user accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-70556?
CVE-2026-70556 is a medium-severity vulnerability in Hubzilla, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Hubzilla versions prior to 11.4 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.
Weakness: CWE-352
Which versions are affected by CVE-2026-70556?
How do I fix CVE-2026-70556?
No fix has been published for CVE-2026-70556 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-70556 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-70556 exists.
Sources
Also known as GHSA-q8qh-69f5-v25q.