{"id":"CVE-2026-70556","title":"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 applica…","summary":"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 applica…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","cwe":["CWE-352"],"vendor":"Hubzilla","product":"Hubzilla","affected":["Hubzilla < 11.4"],"published":"2026-08-06","updated":"2026-09-24","sourceUpdated":"2026-09-24T20:06:30.133","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-70556","references":[{"url":"https://framagit.org/hubzilla/core","label":"disclosure@vulncheck.com"},{"url":"https://framagit.org/hubzilla/core/-/blob/dev/Zotlabs/Module/Authorize.php?ref_type=heads#L49","label":"disclosure@vulncheck.com"},{"url":"https://hub.volse.no/cloud/harald/Skjermopptak_20260616_095037.webm","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/hubzilla-csrf-via-oauth2-authorize-endpoint-app-registration","label":"disclosure@vulncheck.com"},{"url":"https://hub.volse.no/cloud/harald/Skjermopptak_20260616_095037.webm","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.0019,"epssPercentile":0.07632,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-06T14:07:25.691300Z"},"ingestedAt":"2026-09-24T15:45:56.716Z","slug":"CVE-2026-70556","body":"## Overview\n\nHubzilla  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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":36,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}