CVE-2026-89022

HIGHPre-NVD 7.47.4—
EchelonGraph scoreHIGH confidence

Score 7.4 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-15. a secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: None knownExposed: 0

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

BookStack before 26.05.5 contains an authentication bypass vulnerability in its social login implementation that allows unauthenticated attackers to sign in as arbitrary users by authenticating through a different social provider sharing the same driver_id namespace. Attackers can authenticate at one enabled social provider using a user ID that matches an account linked to a different social provider, bypassing credential verification entirely because the SocialAuthService::handleLoginCallback query ignores the driver column when retrieving linked account records.

CVSS v3
7.4
EG Score
7.4(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
No patch confirmed yet.
generic

BookStack < 26.05.5 Authentication Bypass via Social Login Provider Confusion | Advisories | VulnCheck

https://www.vulncheck.com/advisories/bookstack-authentication-bypass-via-social-login-provider-confusion
generic

BookStack Security Release v26.05.5 · BookStack

https://www.bookstackapp.com/blog/bookstack-release-v26-05-5/

Vendor Advisories for CVE-2026-89022(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 / 23× 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. 2026-09-19 16:36 UTCEG score recompute
  2. 2026-09-19 16:36 UTCGHSA enrichment
  3. 2026-09-19 05:17 UTCEG score recompute
  4. 2026-09-19 05:17 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 17:59 UTCGHSA enrichment
  7. 2026-09-18 06:40 UTCEG score recompute
  8. 2026-09-18 06:40 UTCGHSA enrichment
  9. 2026-09-17 19:32 UTCEPSS rescore
  10. 2026-09-17 19:21 UTCGHSA enrichment
  11. 2026-09-17 07:16 UTCGHSA enrichment
  12. 2026-09-16 19:57 UTCGHSA enrichment
  13. 2026-09-16 18:15 UTCEG score recompute
  14. 2026-09-16 18:15 UTCGHSA enrichment
  15. 2026-09-16 14:09 UTCEPSS rescore
  16. 2026-09-16 06:56 UTCGHSA enrichment
  17. 2026-09-15 19:38 UTCEG score recompute
  18. 2026-09-15 19:38 UTCGHSA enrichment
  19. 2026-09-15 19:13 UTCEG score recompute
  20. 2026-09-15 19:13 UTCGHSA enrichment
  21. 2026-09-15 17:32 UTCEG score recompute
  22. 2026-09-15 16:18 UTCEG score recompute
  23. 2026-09-15 16:17 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-89022?
CVE-2026-89022 is a high vulnerability published on September 15, 2026. BookStack before 26.05.5 contains an authentication bypass vulnerability in its social login implementation that allows unauthenticated attackers to sign in as arbitrary users by authenticating through a different social provider sharing the same driver_id namespace. Attackers can authenticate at…
When was CVE-2026-89022 disclosed?
CVE-2026-89022 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89022 actively exploited?
CVE-2026-89022 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 78.5% of all scored CVEs.
What is the CVSS score of CVE-2026-89022?
CVE-2026-89022 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-89022?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-89022, 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-2026-89022

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