TI-2022-06028 Aliases CVE-2022-21650

Stored XSS via html file upload in convos

HIGH 66CWE-79Published 2022-01-04 · Updated 2025-04-22

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: High · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00858 58th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed convos (convos-chat): 6.52

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
convos-chat	convos	6.48 to before 6.52	6.52	Patch available	CNA

convos Vendorconvos-chat Affected 6.48 to before 6.52 Fixed in 6.52 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:convos:convos::::::::	6.48 to before 6.52	Vulnerable	Convos

cpe:2.3:a:convos:convos:*:*:*:*:*:*:*:* Versions 6.48 to before 6.52 Vulnerable ·Convos

Remediation

Fix · CNA convos (convos-chat) Fixed in 6.52

Timeline

2026-10-02 Threatist record created from CVE-2022-21650

References

Exploit 1

https://www.huntr.dev/bounties/ae424798-de01-4972-b73b-2db674f82368/

Patch 2

Other 1

https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#First-vulnerability

TI-2022-06027 Stored XSS via attribute in convos CVSS 3.1HIGH 7.6
TI-2021-18861 A Stored Cross Site Scripting (XSS) issue exists in Convos-Chat before 6.32. CVSS 3.1MEDIUM 5.4
TI-2020-11284 Convos before 4.20 does not properly generate a random secret in Core/Settings.pm and… CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences