CVE-2020-26210

Summary

In BookStack before version 0.30.4, a user with permissions to edit a page could add an attached link which would execute untrusted JavaScript code when clicked by a viewer of the page. Dangerous content may remain in the database after this update. If you think this could have been exploited the linked advisory provides a SQL query to test. As a workaround, page edit permissions could be limited to only those that are trusted until you can upgrade although this will not address existing exploitation of this vulnerability. The issue is fixed in version 0.30.4.

Impact & exploitability

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://bookstackapp.com/blog/beta-release-v0-30-4/ ↗

Additional information

• NVD record
• https://bookstackapp.com/blog/beta-release-v0-30-4/Patch
• https://github.com/BookStackApp/BookStack/commit/349162ea139556b2d25e09e155cec84e21cc9227Patch
• https://github.com/BookStackApp/BookStack/releases/tag/v0.30.4Advisory
• https://github.com/BookStackApp/BookStack/security/advisories/GHSA-7p2j-4h6p-cq3hAdvisory