CVE-2020-36948CWE-863

VestaCP 0.9.8-26 - 'LoginAs' Insufficient Session Validation

High · published January 27, 2026

CVSS v4.0
8.7
EPSS
1%
Percentile
50.0
In the wild
Unconfirmed
What it is

⚡ A meddlesome session token vulnerability lurks in VestaCP's LoginAs module! This flaw lets attackers slip through the back door and access user accounts with no proper permissions. 🔥 Think of it like a hotel that lets anyone waltz in and use their room key without checking their identity — a simple oversight that could lead to a lot of unauthorized visitors! If exploited, attackers could gain unauthorized access to user accounts and perform sensitive actions, potentially leading to data breaches or worse. This kind of vulnerability opens the floodgates for mischief and chaos, which no one wants to deal with!

Put simply

Think of it like a hotel that lets anyone waltz in and use their room key without checking their identity — a simple oversight that could lead to a lot of unauthorized visitors! This vulnerability arises from insufficient validation of session tokens in VestaCP's LoginAs module, allowing attackers to manipulate these tokens to impersonate legitimate users without proper authorization.

What to do

If exploited, attackers could gain unauthorized access to user accounts and perform sensitive actions, potentially leading to data breaches or worse. This kind of vulnerability opens the floodgates for mischief and chaos, which no one wants to deal with! To secure your system, immediately update VestaCP to the latest version where this flaw is patched. Review your authentication mechanisms to ensure strict validation of session tokens and monitor user account activity for any suspicious behavior. 🛡️ You've got this! With the right steps, you can lock this vulnerability down and keep your system safe! 🚀

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00639 · 50.0th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-01-27T15:23Z
EPSS history
Timeline
  • 27 JAN 15:23Z
    VestaCP 0.9.8-26 - 'LoginAs' Insufficient Session Validation
    cvelistv5