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CVE-2026-75524— OpenReception: race condition in add-to-tunnel and create-new-client allows overlapping appointments for one agent

Quick assessment

Affected
open-reception appointment-booking-software
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenReception 的预约预订软件提供了一个端到端加密的预约预订平台。在 2.2.2 版本之前，攻击者可以对某位代理进行超额预订，将多个预约插入到本应保持独占的同一时间段内。重叠预约的数量与并发请求的数量相等，且仅需一个预订令牌即可实施攻击，因为该令牌在插入操作后即被消耗。这导致预约日历的完整性遭到破坏，其他客户端无法获得可用的预约时段。该问题已在 2.2.2 版本中修复。

CVSS 5.4 · Medium
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I. Basic Information for CVE-2026-75524

Vulnerability Information
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Vulnerability Title
OpenReception: race condition in add-to-tunnel and create-new-client allows overlapping appointments for one agent
Source: CVE Program / CVE List V5
Vulnerability Description
OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 2.2.2, an attacker overbooks an agent, placing multiple appointments into a single time slot that the system is designed to keep exclusive. The number of overlapping appointments equals the number of concurrent requests, and one booking token is enough because the token is consumed after the insert. This results in the integrity of the booking-calendar breaking and availability being denied to other clients. This issue has been patched in version 2.2.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-reception appointment-booking-software < 2.2.2 -

II. Public POCs for CVE-2026-75524

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III. Intelligence Information for CVE-2026-75524

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Patches & Fixes for CVE-2026-75524 (2)

Vendor Advisories for CVE-2026-75524 (1)

Same Patch Batch · open-reception · 2026-10-23 · 5 CVEs total

CVE-2026-58202 8.3 HIGH OpenReception: Confirmation-email links built from the request Host enable pending-account
CVE-2026-65825 7.5 HIGH OpenReception: one tenant's throttle row disables the PIN brute-force throttle for the sam
CVE-2026-65824 7.4 HIGH OpenReception: invite confirmation token is replayable within its validity window and re-i
CVE-2026-75525 5.3 MEDIUM OpenReception: unauthenticated ML-KEM key injection into the staff-crypto recipient direct

IV. Related Vulnerabilities

Same product: appointment-booking-software
Same vendor: open-reception
Same weakness: CWE-367

V. Comments for CVE-2026-75524

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