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Fencer Vulns
critical 9.8

CVE-2020-36948 json

VestaCP 0.9.8-26 - 'LoginAs' Insufficient Session Validation

published 2026-01-27 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2020-30863

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

VestaCP 0.9.8-26 contains a session token vulnerability in the LoginAs module that allows remote attackers to manipulate authentication tokens. Attackers can exploit insufficient token validation to access user accounts and perform unauthorized login requests without proper administrative permissions.

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
9 mo ago

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • exploit-db.com https://www.exploit-db.com/exploits/49219 referenced PoC, tagged "exploit" by a source, unverified
  • vulnerability-lab.com https://www.vulnerability-lab.com/get_content.php?id=2240 referenced PoC, tagged "exploit" by a source, unverified
  • vulnerability-lab.com https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M. referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.7 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
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 4.0 8.7 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • VestaCP VestaCP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.