XSS in Bookstackapp Bookstack
CVE-2020-26210
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.012 (66.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Bookstackapp Bookstack — versions < 0.30.4
Weakness classification (CWE)
References
- github.com/BookStackApp/BookStack/security/advisories/GHSA-7p2j-4h6p-cq3h (Exploit, Third Party Advisory)
- github.com/BookStackApp/BookStack/commit/349162ea139556b2d25e09e155cec84e21cc92… (Patch, Third Party Advisory)
- bookstackapp.com/blog/beta-release-v0-30-4/ (Exploit, Patch, Vendor Advisory)
- github.com/BookStackApp/BookStack/releases/tag/v0.30.4 (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-26210?
- CVE-2020-26210 is a high-severity vulnerability in Bookstackapp Bookstack, classified under Cross-site Scripting. CVSS score: 7.7/10. Published 2020-11-03.
- How severe is CVE-2020-26210?
- High severity. CVSS v3 base score is 7.7 out of 10.