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Fencer Vulns
critical 9.8

CVE-2023-2834 json

BookIt <= 2.3.7 - Authentication Bypass

published 2023-06-30 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-34285

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

The BookIt plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 2.3.7. This is due to insufficient verification on the user being supplied during booking an appointment through the plugin. This makes it possible for unauthenticated attackers to log in as any existing user on the site, such as an administrator, if they have access to the email.

Patch / fix

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
23 mo ago

Exploit prediction

1.91% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • wordfence.com https://www.wordfence.com/blog/2023/06/stylemixthemes-addresses-authentication-bypass-vulnerability-in-bookit-wordpress-plugin/ referenced PoC, tagged "exploit" by a source, unverified
  • lana.codes https://lana.codes/lanavdb/0dea1346-fd60-4338-8af6-6f89c29075d4/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • stellarwp Bookit — Booking & Appointment Calendar

Classification

Weakness
  • CWE-288 Authentication Bypass Using an Alternate Path or Channel
  • CWE-306 Missing Authentication for Critical Functionality
Technology feeds

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.