CVE-2022-21650

Name: CVE-2022-21650
Creator: NVD / NIST
Published: 2022-01-04T21:15:07.943+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.83%

Last modified Jun 17, 2026

CVE-2022-21650 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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. EPSS estimates a 0.83% chance of exploitation in the next 30 days.

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

5.4/10

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

EPSS Probability

0.83%

52.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Convos	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
Status: Modified

Frequently Asked Questions

What is CVE-2022-21650?

How severe is CVE-2022-21650?

CVE-2022-21650 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.83% probability of exploitation in the next 30 days.

How do I fix CVE-2022-21650?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-21650?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST