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CVE-2026-48087— OpenReception: WebAuthn passkey injection allows account takeover

Quick assessment

Affected
open-reception appointment-booking-software
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

open-reception appointment-booking-software是open-reception组织的一款预约安排软件。 open-reception appointment-booking-software 1.0.2之前版本存在授权问题漏洞，该漏洞源于注册处理程序未验证URL中的userId是否属于该电子邮件，可能导致未认证攻击者将自身凭据添加到受害者账户并接管账户。

CVSS 9.8 · Critical EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1110 · Brute Force

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-reception appointment-booking-software < 1.0.2 affected
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I. Basic Information for CVE-2026-48087

Vulnerability Information
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Vulnerability Title
OpenReception: WebAuthn passkey injection allows account takeover
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 1.0.2, the registration handler at `POST /api/auth/register/{userId}` validates the relationship between the WebAuthn challenge and the registration cookie's email but never validates that the `userId` in the URL belongs to that email. An unauthenticated attacker requests a challenge for their own email, generates a registration response with their own authenticator, and submits it against any victim user's URL. The challenge-vs-cookie email match passes, the WebAuthn ceremony validates, and `addPasskey` writes the attacker's credential into the victim's `user_passkey` rows. The next victim-email login accepts a passkey assertion from the attacker's authenticator and issues a session as the victim. User IDs are not strictly secret on this platform, but the exact set of exposure surfaces should be assessed by the maintainers. Staff-list endpoints return user IDs to authenticated tenant members per the route signature; live verification of all exposure surfaces (whether user IDs leak through any unauthenticated route, through invite-confirmation URLs, or through other administrative views) is part of the pending live PoC. Where the attacker knows the victim's email and userId, the analysis below becomes account takeover. Version 1.0.2 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
open-reception appointment-booking-software 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
open-reception appointment-booking-software是open-reception组织的一款预约安排软件。 open-reception appointment-booking-software 1.0.2之前版本存在授权问题漏洞，该漏洞源于注册处理程序未验证URL中的userId是否属于该电子邮件，可能导致未认证攻击者将自身凭据添加到受害者账户并接管账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-reception appointment-booking-software < 1.0.2 -

II. Public POCs for CVE-2026-48087

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Qwen3.6-35B-A3B · 9285 chars
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III. Intelligence Information for CVE-2026-48087

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Patches & Fixes for CVE-2026-48087 (1)

Vendor Advisories for CVE-2026-48087 (1)

Same Patch Batch · open-reception · 2026-08-06 · 16 CVEs total

CVE-2026-48086 9.9 CRITICAL OpenReception: Tenant admin self-promotes to GLOBAL_ADMIN
CVE-2026-48085 9.8 CRITICAL OpenReception has unauthenticated GLOBAL_ADMIN account creation post-bootstrap
CVE-2026-48088 9.4 CRITICAL OpenReception vulnerable to unauthenticated staff crypto poisoning that breaks E2E recipie
CVE-2026-48081 8.1 HIGH OpenReception vulnerable to stored click-triggered XSS via javascript: tenant links render
CVE-2026-48080 8.0 HIGH OpenReception's tenant detail endpoint discloses live PostgreSQL connection string, superu
CVE-2026-48084 7.4 HIGH OpenReception doesn't rate limit passphrase login attempts
CVE-2026-48079 7.4 HIGH OpenReception's logout page clears local access_token before server-side revocation, leavi
CVE-2026-48076 6.5 MEDIUM OpenReception's bootstrap booking flow allows unauthenticated booking on isPublic=false ch
CVE-2026-48083 6.5 MEDIUM OpenReception: Unauthenticated POST /api/log accepts arbitrary content with CRLF injection
CVE-2026-48075 6.5 MEDIUM OpenReception's unauthenticated add-to-tunnel endpoint accepts arbitrary appointment injec
CVE-2026-48071 5.8 MEDIUM OpenReception's client PIN challenge throttle is keyed by emailHash only, allowing cross-t
CVE-2026-48078 5.3 MEDIUM OpenReception's schedule endpoint discloses isPublic=false channels and slot availability
CVE-2026-48077 5.3 MEDIUM OpenReception: GET appointment by ID returns full appointment record without authorization
CVE-2026-48082 3.7 LOW OpenReception's bootstrap challenge proof-of-work difficulty hardcoded to 16 bits, which e
CVE-2026-48074 2.7 LOW OpenReception: Staff deletion removes pending invites cross-tenant by email match

IV. Related Vulnerabilities

Same product: appointment-booking-software
Same vendor: open-reception
Same weakness: CWE-287

V. Comments for CVE-2026-48087

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