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CVE

CVE-2026-89022

BookStack < 26.05.5 Authentication Bypass via Social Login Provider Confusion
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CVE

CVE-2026-89022

BookStack < 26.05.5 Authentication Bypass via Social Login Provider Confusion

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
4.0
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:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89022.json, https://nvd.nist.gov/vuln/detail/CVE-2026-89022, https://www.bookstackapp.com/blog/bookstack-release-v26-05-5/, https://www.vulncheck.com/advisories/bookstack-authentication-bypass-via-social-login-provider-confusion, https://github.com/bookstackapp/bookstack

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00465%
EPSS Percentile
0.38939%
Introduced Version
0
Fix Available
771a2d04927dab0ce07edc5874aeb18896f830c4

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