TI-2026-49277 Aliases CVE-2026-70556 GHSA-q8qh-69f5-v25q

Hubzilla version prior to 11.4 CSRF via OAuth2 /authorize Endpoint App Registration

MEDIUM 56CWE-352Published 2026-08-06 · Updated 2026-09-24

Key facts

Attack vector: Network
Privileges required: None
User interaction: Active
Attack complexity: Low
Attack requirements: None
Impact type: Tampering
Confidentiality · integrity · availability: None · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-352.

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 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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0019 8th percentileScored 2026-11-07

Fix Fixed Hubzilla (Hubzilla): 11.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Hubzilla	Hubzilla	before 11.4	11.4	Patch available	CNA

Hubzilla VendorHubzilla Affected before 11.4 Fixed in 11.4 Patch available CNA

Remediation

Fix · CNA Hubzilla (Hubzilla) Fixed in 11.4

Timeline

2026-10-02 Threatist record created from CVE-2026-70556
2026-10-03 Alias added: GHSA-q8qh-69f5-v25q

References

Patch 1

Patch Commit

Other 2

TI-2022-10373 A PHP Local File Inclusion vulneraility in the default Redbasic theme for Hubzilla before… CVSS 3.1HIGH 7.5
TI-2022-10372 A PHP Local File inclusion vulnerability in the Redbasic theme for Hubzilla before… CVSS 3.1MEDIUM 6.1
TI-2022-10374 Multiple Cross-Site Scripting (XSS) vulnerabilities in Hubzilla 7.0.3 and earlier allows… CVSS 3.1MEDIUM 6.1

Sources

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