{"id":"CVE-2021-21422","aliases":["GHSA-7p8h-86p5-wv3p"],"url":"https://o3.security/vulnerability/CVE-2021-21422","summary":"Cross-site scripting","details":"mongo-express is a web-based MongoDB admin interface, written with Node.js and express. 1: As mentioned in this issue: https://github.com/mongo-express/mongo-express/issues/577, when the content of a cell grows larger than supported size, clicking on a row will show full document unescaped, however this needs admin interaction on cell. 2: Data cells identified as media will be rendered as media, without being sanitized. Example of different renders: image, audio, video, etc. As an example of type 1 attack, an unauthorized user who only can send a large amount of data in a field of a document may use a payload with embedded javascript. This could send an export of a collection to the attacker without even an admin knowing. Other types of attacks such as dropping a database\\collection are possible.","published":"2021-06-21T19:15:07.947Z","modified":"2026-07-08T06:28:48.756151588Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"npm","name":"mongo-express","fixedVersion":"1.0.0-alpha.4"}],"fix":{"url":"https://github.com/mongo-express/mongo-express/commit/f5e0d4931f856f032f22664b5e5901d5950cfd4b","label":"mongo-express/mongo-express@f5e0d49"},"references":[{"type":"FIX","url":"https://github.com/mongo-express/mongo-express/commit/f5e0d4931f856f032f22664b5e5901d5950cfd4b"},{"type":"EVIDENCE","url":"https://github.com/mongo-express/mongo-express/issues/577"},{"type":"EVIDENCE","url":"https://github.com/mongo-express/mongo-express/security/advisories/GHSA-7p8h-86p5-wv3p"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T06:28:48.756151588Z"}}