XSS in Convos
CVE-2022-21649
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.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.009 (57.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N.
Affected products
- Convos
- Convos-chat Convos — versions >= 6.49, < 6.52
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC, Broken Link)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Exploit, Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-21649?
- CVE-2022-21649 is a high-severity vulnerability in Convos, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2022-01-04.
- How severe is CVE-2022-21649?
- High severity. CVSS v3 base score is 7.6 out of 10.
- Is CVE-2022-21649 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.