CVE-2022-21650

MediumCVSS 5.4/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

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

References

https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#First-vulnerabilityBroken Link
https://github.com/convos-chat/convos/commit/5c0a1ec9a2c147bc3b63fd5a48da5f32e18fe5dfPatch, Third Party Advisory
https://github.com/convos-chat/convos/security/advisories/GHSA-mm2v-4v7g-m695Patch, Third Party Advisory
https://www.huntr.dev/bounties/ae424798-de01-4972-b73b-2db674f82368/Exploit, Issue Tracking, Patch, Third Party Advisory
https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#First-vulnerabilityBroken Link
https://github.com/convos-chat/convos/commit/5c0a1ec9a2c147bc3b63fd5a48da5f32e18fe5dfPatch, Third Party Advisory
https://github.com/convos-chat/convos/security/advisories/GHSA-mm2v-4v7g-m695Patch, Third Party Advisory
https://www.huntr.dev/bounties/ae424798-de01-4972-b73b-2db674f82368/Exploit, Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Jan 4, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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