Global infos:

A logic error when using mb_strpos() to check for potential XSS payload in Bitrix24 22.0.300 allows attackers to bypass XSS sanitisation via placing HTML tags at the begining of the payload.

CVE Status: Modified

References:

[email protected]

af854a3a-2127-422b-91ae-364da2661108

Metrics:

Attribute	Value
Attack Complexity	LOW
Attack Vector	NETWORK
Availability Impact	HIGH
Base Score	9
Base Severity	CRITICAL
Confidentiality Impact	HIGH
Integrity Impact	HIGH
Privileges Required	LOW
Scope	CHANGED
User Interaction	REQUIRED
Vector String	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Exploitability Score	2.3
Impact Score	6
Source	[email protected]
Type	Secondary

Links:

Exploit-db
Github