BookStack < 26.05.5 Authentication Bypass via Social Login Provider Confusion (CVE-2026-89022) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89022

BookStack < 26.05.5 Authentication Bypass via Social Login Provider Confusion

Answer in brief

CVE-2026-89022 records a Unknown severity vulnerability in BookStack < 26.05.5 Authentication Bypass via Social Login Provider Confusion. The current sources do not mark it as known exploited. The current feed maps bookstackapp/bookstack (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Sep 15, 2026Source checked Sep 15, 2026First seen by HOL Sep 15, 2026Material review Sep 15, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps bookstackapp/bookstack (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
bookstackapp/bookstackgeneric	>=0 <26.05.5	26.05.5

Recommended response

Check inventory. Check lockfiles and deployed manifests for bookstackapp/bookstack.
Review the reported fix. Update bookstackapp/bookstack to 26.05.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 15, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.