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Vulnerability record · CVE-2026-125870 · published 12 November 2026

CVE-2026-125870: Incorrect authorization vulnerability

BookStack before 26.09.3 contains a missing authorization vulnerability in ImageController::checkImagePermission() that allows authenticated non-admin users to bypass page-level content restrictions for images whose owning page has been moved to the recycle bin, because the permission check relies on Page::getPage() which returns null for soft-deleted pages and silently skips the PageView check. Attackers can enumerate sequential image IDs via GET /images/edit/{id} to disclose metadata of restricted images, and users with image-update-all/image-delete-all privileges can rename, replace, or permanently delete images belonging to content they cannot view, persisting the damage even after the page is restored.

2.3 CVSS 4.0 Low CWE-863 · Incorrect authorization Received
2.3CVSS 4.0 base score
-EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
12 Nov 2026Last modified by NVD

Description

BookStack before 26.09.3 contains a missing authorization vulnerability in ImageController::checkImagePermission() that allows authenticated non-admin users to bypass page-level content restrictions for images whose owning page has been moved to the recycle bin, because the permission check relies on Page::getPage() which returns null for soft-deleted pages and silently skips the PageView check. Attackers can enumerate sequential image IDs via GET /images/edit/{id} to disclose metadata of restricted images, and users with image-update-all/image-delete-all privileges can rename, replace, or permanently delete images belonging to content they cannot view, persisting the damage even after the page is restored.

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/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://codeberg.org/bookstack/bookstack/releases/tag/v26.09.3
https://github.com/BookStackApp/BookStack/releases/tag/v26.09.3
https://www.bookstackapp.com/blog/bookstack-release-v26-09-3/
https://www.vulncheck.com/advisories/bookstack-before-broken-access-control-via-imagecontroller

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Source: NIST National Vulnerability Database (record CVE-2026-125870), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.