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Vulnerability record · CVE-2026-89022 · published 15 September 2026

CVE-2026-89022: Authentication bypass by spoofing vulnerability

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.

9.1 CVSS 4.0 Critical EPSS 0.46% · top 62.3% CWE-290 · Authentication bypass by spoofing Deferred
9.1CVSS 4.0 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
16 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://www.bookstackapp.com/blog/bookstack-release-v26-05-5/
https://www.vulncheck.com/advisories/bookstack-authentication-bypass-via-social-login-provider-confusion

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Source: NIST National Vulnerability Database (record CVE-2026-89022), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.