CVE-2021-21422

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.

• CWE-79

• https://github.com/mongo-express/mongo-express/commit/f5e0d4931f856f032f22664b5e5901d5950cfd4bPatch, Third Party Advisory
• https://github.com/mongo-express/mongo-express/issues/577Exploit, Third Party Advisory
• https://github.com/mongo-express/mongo-express/security/advisories/GHSA-7p8h-86p5-wv3pExploit, Third Party Advisory
• https://github.com/mongo-express/mongo-express/commit/f5e0d4931f856f032f22664b5e5901d5950cfd4bPatch, Third Party Advisory
• https://github.com/mongo-express/mongo-express/issues/577Exploit, Third Party Advisory
• https://github.com/mongo-express/mongo-express/security/advisories/GHSA-7p8h-86p5-wv3pExploit, Third Party Advisory

Published

Jun 21, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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