Vulnerability · Published Jan 4, 2022 · Assigned by GitHub_M

CVE-2022-21650Stored XSS via html file upload in convos

High 7.6

In plain English

A high-severity cross-site scripting in convos from convos-chat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities).

Severity (CVSS 3.1)7.6High

Exploit odds (30 days)0.9%top 41.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Convos is an open source multi-user chat that runs in a web browser. You can't use SVG extension in Convos' chat window, but you can upload a file with an .html extension. By uploading an SVG file with an html extension the upload filter can be bypassed. This causes Stored XSS. Also, after uploading a file the XSS attack is triggered upon a user viewing the file. Through this vulnerability, an attacker is capable to execute malicious scripts. Users are advised to update as soon as possible.

Affected products (as reported)

Vendor	Product	Versions
convos-chat	convos	>= 6.48, < 6.52

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

References

https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#First-vulnerability x_refsource_MISC
https://github.com/convos-chat/convos/commit/5c0a1ec9a2c147bc3b63fd5a48da5f32e18fe5df x_refsource_MISC
https://www.huntr.dev/bounties/ae424798-de01-4972-b73b-2db674f82368/ x_refsource_MISC
https://github.com/convos-chat/convos/security/advisories/GHSA-mm2v-4v7g-m695 x_refsource_CONFIRM