XSS in Bookstackapp Bookstack
CVE-2020-11055
In BookStack greater than or equal to 0.18.0 and less than 0.29.2, there is an XSS vulnerability in comment creation. A user with permission to create comments could POST HTML directly to the system to be saved in a comment, which would then be executed/displayed to others users viewing the comment. Through this vulnerability custom JavaScript code could be injected and therefore ran on other user machines. This most impacts scenarios where not-trusted users are given permission to create comments. This has been fixed in 0.29.2.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.008 (54.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Bookstackapp Bookstack — versions >= 0.18.0, < 0.29.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/BookStackApp/BookStack/security/advisories/GHSA-5vf7-q87h-pg6w (Third Party Advisory)
- bookstackapp.com/blog/beta-release-v0-29-2/ (Release Notes, Vendor Advisory)
- github.com/BookStackApp/BookStack/releases/tag/v0.29.2 (Release Notes)
- jvn.jp/en/jp/JVN41035278/index.html (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2020-11055?
- CVE-2020-11055 is a medium-severity vulnerability in Bookstackapp Bookstack, classified under Cross-site Scripting. CVSS score: 6.3/10. Published 2020-05-07.
- How severe is CVE-2020-11055?
- Medium severity. CVSS v3 base score is 6.3 out of 10.
- Is CVE-2020-11055 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.