Vulnerability · Published Jan 4, 2022 · Assigned by GitHub_M

CVE-2022-21649Stored XSS via attribute in convos

High 7.6

In plain English

A high-severity cross-site scripting in convos from convos-chat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities).

Severity (CVSS 3.1)7.6High

Exploit odds (30 days)1.0%top 38.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
convos-chat	convos	>= 6.49, < 6.52

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

References

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