{"id":"CVE-2020-11055","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-11055","generatedAt":"2026-10-27T23:43:51.572Z","title":"In BookStack greater than or equal to 0.18.0 and less than 0.29.2, there is an XSS vulnerability in comment creation.","description":"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.","published":"2020-05-07T21:15:12.000Z","lastModified":"2026-06-17T02:48:57.000Z","status":"Modified","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":["bookstackapp/bookstack"],"epss":{"score":0.00782,"percentile":0.5573,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.78%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://jvn.jp/en/jp/JVN41035278/index.html","tags":["Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://bookstackapp.com/blog/beta-release-v0-29-2/","tags":["Release Notes","Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/BookStackApp/BookStack/releases/tag/v0.29.2","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/BookStackApp/BookStack/security/advisories/GHSA-5vf7-q87h-pg6w","tags":["Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"http://jvn.jp/en/jp/JVN41035278/index.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bookstackapp.com/blog/beta-release-v0-29-2/","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/BookStackApp/BookStack/releases/tag/v0.29.2","tags":["Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/BookStackApp/BookStack/security/advisories/GHSA-5vf7-q87h-pg6w","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-11055","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}