CVE-2026-70556

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-08-06. the CNA's CVSS baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
4.3
EG Score
4.3(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 14, 2026

Advisory Details (4)

Auto-updated Aug 6, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Hubzilla 11.2.1 CSRF via OAuth2 /authorize Endpoint App Registration | Advisories | VulnCheck

https://www.vulncheck.com/advisories/hubzilla-csrf-via-oauth2-authorize-endpoint-app-registration
generic

Zotlabs/Module/Authorize.php · dev · hubzilla / core · GitLab

https://framagit.org/hubzilla/core/-/blob/dev/Zotlabs/Module/Authorize.php?ref_type=heads#L49
generic
https://hub.volse.no/cloud/harald/Skjermopptak_20260616_095037.webm
generic

hubzilla / core · GitLab

https://framagit.org/hubzilla/core

Vendor Advisories for CVE-2026-70556(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 23× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-21 05:56 UTCEG score recompute
  2. 2026-08-21 05:56 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 03:49 UTCEG score recompute
  5. 2026-08-20 03:49 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 01:39 UTCEG score recompute
  8. 2026-08-19 01:39 UTCGHSA enrichment
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-17 23:32 UTCEG score recompute
  12. 2026-08-17 23:32 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-16 21:25 UTCEG score recompute
  15. 2026-08-16 21:25 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 02:15 UTCEPSS rescore
  19. 2026-08-15 19:18 UTCEG score recompute
  20. 2026-08-15 19:18 UTCGHSA enrichment
  21. 2026-08-15 01:31 UTCEPSS rescore
  22. 2026-08-14 17:11 UTCEG score recompute
  23. 2026-08-14 17:11 UTCGHSA enrichment
  24. 2026-08-13 22:00 UTCEPSS rescore
  25. 2026-08-13 21:23 UTCEG score recompute
Show 21 more
  1. 2026-08-13 21:23 UTCGHSA enrichment
  2. 2026-08-13 20:38 UTCEG score recompute
  3. 2026-08-13 20:38 UTCGHSA enrichment
  4. 2026-08-13 04:09 UTCEG score recompute
  5. 2026-08-13 04:09 UTCGHSA enrichment
  6. 2026-08-12 13:51 UTCEPSS rescore
  7. 2026-08-12 02:03 UTCEG score recompute
  8. 2026-08-12 02:03 UTCGHSA enrichment
  9. 2026-08-11 00:00 UTCEPSS rescore
  10. 2026-08-10 23:56 UTCGHSA enrichment
  11. 2026-08-09 21:48 UTCEG score recompute
  12. 2026-08-09 21:48 UTCGHSA enrichment
  13. 2026-08-09 13:47 UTCEPSS rescore
  14. 2026-08-08 19:42 UTCGHSA enrichment
  15. 2026-08-07 17:35 UTCEG score recompute
  16. 2026-08-07 17:35 UTCGHSA enrichment
  17. 2026-08-06 15:29 UTCEG score recompute
  18. 2026-08-06 14:45 UTCEG score recompute
  19. 2026-08-06 13:36 UTCEG score recompute
  20. 2026-08-06 12:33 UTCEG score recompute
  21. 2026-08-06 12:33 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-70556?
CVE-2026-70556 is a medium vulnerability published on August 6, 2026. 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…
When was CVE-2026-70556 disclosed?
CVE-2026-70556 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70556 actively exploited?
CVE-2026-70556 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.1% of all scored CVEs.
What is the CVSS score of CVE-2026-70556?
CVE-2026-70556 has a CVSS v4.0 base score of 4.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-70556?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70556, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-70556

Explore →

Is Your Infrastructure Affected by CVE-2026-70556?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs