# CVE-2026-58202: OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform.


- **Severity:** High 8.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 23 Oct 2026
- **Updated:** 29 Oct 2026
- **Also known as:** GHSA-w5g9-g2p4-2g4m

## What is CVE-2026-58202?

CVE-2026-58202 is a high-severity vulnerability in open-reception appointment-booking-software, published on 23 Oct 2026. 

### Official description

OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 2.0.0, the account-confirmation link in emails is built from the request Host header, with no allowlist. The unauthenticated POST /api/auth/resend-confirmation rotates a pending invitee's confirmation token and emails a link whose host comes from the request. An attacker who sends one resend-confirmation with Host: attacker.example and a pending invitee's email causes that invitee to receive a confirmation email whose only link points to the attacker. If the invitee clicks, the one-time confirmation token reaches the attacker, who then confirms the account on the real tenant domain and registers a passkey they control, taking over the account before the legitimate invitee ever uses it. All released versions through v1.1.0 are affected; no patched version exists yet. Reaching the app with a spoofed Host depends on the front proxy: the stock Caddy catch-all forwards it, while an operator who configures explicit per-tenant proxy blocks is not affected (see Details 4). The invite path builds links from the trusted tenant.domain (invite/+server.ts:204-210); the resend-confirmation path builds them from the request Host. This issue has been patched in version 2.0.0.

Weakness: CWE-640 (Weak Password Recovery Mechanism for Forgotten Password)

## Which versions are affected by CVE-2026-58202?


## How do I fix CVE-2026-58202?

No fix has been published for CVE-2026-58202 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-58202 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58202 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-58202 and fix it if it is affected.

What it is: CVE-2026-58202 is a high-severity vulnerability in open-reception appointment-booking-software, published on 23 Oct 2026. 
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58202 exists.

Affected product: open-reception appointment-booking-software. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-58202/ (Markdown: https://insights.sbomify.com/CVE-2026-58202/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-58202
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-58202
- OSV: https://osv.dev/vulnerability/CVE-2026-58202

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-58202/
Summaries are generated and may contain mistakes; the official description above is the record.