What’s Vulnerable › Vulnerabilities

CVE-2022-21649: Stored XSS via attribute in convos

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-01-04 · updated 2026-06-17
• Weakness: CWE-79

Description

Convos is an open source multi-user chat that runs in a web browser. Characters starting with "https://" in the chat window create an <a> tag. Stored XSS vulnerability using onfocus and autofocus occurs because escaping exists for "<" or ">" but escaping for double quotes does not exist. Through this vulnerability, an attacker is capable to execute malicious scripts. Users are advised to update as soon as possible.

Affected products

• convos-chat convos: before 6.52 — fixed in 6.52

How to fix

Upgrade to a fixed version: convos-chat convos 6.52. Check the vendor advisory for mitigations.

References

• https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#Second-vulnerability
• https://github.com/convos-chat/convos/commit/86b2193de375005ba71d9dd53843562c6ac1847c
• https://github.com/convos-chat/convos/security/advisories/GHSA-xmpj-xwm3-vww7
• https://www.huntr.dev/bounties/4532a0ac-4e7c-4fcf-9fe3-630e132325c0/
• https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#Second-vulnerability
• https://github.com/convos-chat/convos/commit/86b2193de375005ba71d9dd53843562c6ac1847c
• https://github.com/convos-chat/convos/security/advisories/GHSA-xmpj-xwm3-vww7
• https://www.huntr.dev/bounties/4532a0ac-4e7c-4fcf-9fe3-630e132325c0/

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