{"id":"CVE-2021-31330","aliases":["BIT-reviewboard-2021-31330","EUVD-2021-18240","GHSA-mhg9-m5gc-hhqw"],"status":"published","title":"A Cross-Site Scripting (XSS) vulnerability exists within Review Board versions 3.0.20 and 4.0 RC1...","description":"A Cross-Site Scripting (XSS) vulnerability exists within Review Board versions 3.0.20 and 4.0 RC1 and earlier. An authenticated attacker may inject malicious Javascript code when using Markdown editing within the application which remains persistent.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00822,"percentile":0.57567,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2022-05-11T17:34:27Z","modified":"2026-06-17T03:51:34Z","affected":[{"source":"osv","ecosystem":"Bitnami","package":"reviewboard","ranges":[{"type":"SEMVER","events":[{"introduced":"3.0.20"},{"last_affected":"3.0.20"}]},{"type":"SEMVER","events":[{"introduced":"4.0-beta1.0"},{"last_affected":"4.0-beta1.0"},{"introduced":"4.0-beta2.0"},{"last_affected":"4.0-beta2.0"},{"introduced":"4.0-rc1.0"},{"last_affected":"4.0-rc1.0"}]}]}],"products":[{"vendor":"reviewboard","product":"review_board"}],"references":[{"url":"https://mattschmidt.net/2021/04/14/review-board-xss-discovered/","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","web"]},{"url":"https://www.reviewboard.org/news/2021/04/14/review-board-3-0-21-and-4-0-rc-2-security-bug-fixes-and-docker/","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","web"]},{"url":"https://www.reviewboard.org/docs/releasenotes/reviewboard/3.0.21/","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","web"]},{"url":"https://www.reviewboard.org/docs/releasenotes/reviewboard/4.0-rc-2/","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31330"},{"url":"https://github.com/advisories/GHSA-mhg9-m5gc-hhqw"}],"sources":{"cve":[{"id":"CVE-2021-31330","description":"A Cross-Site Scripting (XSS) vulnerability exists within Review Board versions 3.0.20 and 4.0 RC1 and earlier. An authenticated attacker may inject malicious Javascript code when using Markdown editing within the application which remains persistent.","status":"published","published":"2022-05-11T17:34:27Z","modified":"2024-08-03T22:55:53.47Z","updated_at":"2026-11-02T14:33:05.331617Z"}],"euvd":[{"id":"EUVD-2021-18240","description":"A Cross-Site Scripting (XSS) vulnerability exists within Review Board versions 3.0.20 and 4.0 RC1 and earlier. An authenticated attacker may inject malicious Javascript code when using Markdown editing within the application which remains persistent.","status":"published","published":"2022-05-11T17:34:27Z","modified":"2024-08-03T22:55:53Z","updated_at":"2026-11-03T03:24:39.559154Z"}],"ghsa":[{"id":"GHSA-mhg9-m5gc-hhqw","title":"A Cross-Site Scripting (XSS) vulnerability exists within Review Board versions 3.0.20 and 4.0 RC1...","description":"A Cross-Site Scripting (XSS) vulnerability exists within Review Board versions 3.0.20 and 4.0 RC1 and earlier. An authenticated attacker may inject malicious Javascript code when using Markdown editing within the application which remains persistent.","status":"published","published":"2022-05-12T00:00:36Z","modified":"2023-02-01T05:02:13Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:49:52.298896Z"}],"nvd":[{"id":"CVE-2021-31330","description":"A Cross-Site Scripting (XSS) vulnerability exists within Review Board versions 3.0.20 and 4.0 RC1 and earlier. An authenticated attacker may inject malicious Javascript code when using Markdown editing within the application which remains persistent.","status":"published","published":"2022-05-11T18:15:22.303Z","modified":"2026-06-17T03:51:34.047Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:07:06.029737Z"}],"osv":[{"id":"BIT-reviewboard-2021-31330","description":"A Cross-Site Scripting (XSS) vulnerability exists within Review Board versions 3.0.20 and 4.0 RC1 and earlier. An authenticated attacker may inject malicious Javascript code when using Markdown editing within the application which remains persistent.","status":"published","published":"2024-01-31T15:23:15.886Z","modified":"2024-02-19T10:36:29.17Z","updated_at":"2026-11-02T15:28:35.111822Z"}]}}