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CVE-2022-21649

Date: January 4, 2022

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.

Language: Perl

Severity Score

Related Resources (6)

https://github.com/convos-chat/convos/security/advisories/GHSA-xmpj-xwm3-vww7
https://nvd.nist.gov/vuln/detail/CVE-2022-21649
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://www.huntr.dev/bounties/4532a0ac-4e7c-4fcf-9fe3-630e132325c0/
https://www.mend.io/vulnerability-database/CVE-2022-21649

Severity Score

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): SINGLE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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