In Rukovoditel 2.5.2, users' passwords and usernames are stored in a cookie with URL encoding, base64 encoding, and hashing. Thus, an attacker can easily apply brute force on them.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-11821
• https://fatihhcelik.blogspot.com/2020/01/rukovoditel-password-hash-in-cookie-url.html