CVE-2026-17023Public exploitNetwork attack vector

Unauthenticated calendar hijack via unchecked OAuth callback

Published Aug 10, 2026 · Updated Aug 10, 2026

Improper access control in Salon Booking System 10.30.33 and earlier allows remote attackers to hijack Google Calendar connections. The unauthenticated googleoauth-callback AJAX action exchanges an attacker-supplied authorization code and stores the resulting site-wide access and refresh tokens without a capability check or OAuth state validation. The target must have its own Google OAuth client configured and calendar synchronization enabled; successful exploitation replaces or breaks the owner's calendar connection.

CVSS severity4.8
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Salon Booking System 10.30.33 and earlier allows remote attackers to hijack Google Calendar connections. The unauthenticated googleoauth-callback AJAX action exchanges an attacker-supplied authorization code and stores the resulting site-wide access and refresh tokens without a capability check or OAuth state validation. The target must have its own Google OAuth client configured and calendar synchronization enabled; successful exploitation replaces or breaks the owner's calendar connection.

The record

CVE
CVE-2026-17023
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
Salonbookingsystem OÜ
Product
Salon Booking System
Classifications
CWE-284
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=10.30.33

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Salonbookingsystem OÜ · Salon Booking Systemversion=0 <=10.30.33

Published CVSS scores

4.8CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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