CVE-2020-26210

Cross-Site Scripting in BookStack

CVSS 7.7 HIGHEPSS 1.2%CWE-79

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.7EPSS 1.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

03 Nov 2020Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

BookStackApp · BookStack

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References

https://bookstackapp.com/blog/beta-release-v0-30-4/https://github.com/BookStackApp/BookStack/commit/349162ea139556b2d25e09e155cec84e21cc9227 https://github.com/BookStackApp/BookStack/releases/tag/v0.30.4 https://github.com/BookStackApp/BookStack/security/advisories/GHSA-7p2j-4h6p-cq3h