Security Bulletin
This security bulletin contains one low risk vulnerability.
EUVDB-ID: #VU50772
Risk: Low
CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-27237
CWE-ID:
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Exploit availability: No
DescriptionThe disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in the Display Name field in "backend/preferences/ajax_save.php". A remote authenticated attacker can permanently inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
MitigationCybersecurity Help is currently unaware of any official solution to address this vulnerability..
Vulnerable software versionsBlackCat: 1.3.6
CPE2.3 External linkshttps://github.com/BlackCatDevelopment/BlackCatCMS/commits/release-1.4/upload/backend/preferences/ajax_save.php
https://github.com/BlackCatDevelopment/BlackCatCMS/compare/1.3.6...1.4Beta
https://www.exploit-db.com/exploits/49565
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.