# CVE-2026-52841: Easy!Appointments: Authorization bypass in Google OAuth provider binding lets any backend user rebind a peer provider's Google sync

> Logged-in users can rebind other users' Google OAuth providers to their own accounts, gaining unauthorized access to peer appointment data.

- **Severity:** Low 3.1 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Jul 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-8hm4-r66f-29wr

## What is CVE-2026-52841?

CVE-2026-52841 is a low-severity missing authorization vulnerability in alextselegidis easyappointments, published on 14 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, `Google::oauth` at `application/controllers/Google.php:278` stores its URL-supplied `provider_id` in the session, and `oauth_callback` saves the issued Google OAuth token against that row without checking the caller owns the provider. Any logged-in backend user (admin, provider, or secretary) rebinds a peer provider's Google sync to a Google account they control. The peer's appointments then sync into the attacker's calendar with each customer's name and email attached as attendee data. Version 1.6.0 patches the issue.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-52841?

2 open source packages ship an affected version, including alextselegidis/easyappointments.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `alextselegidis/easyappointments` | Packagist | All versions to 1.5.2 | None |
| `alextselegidis/easyappointments` | Packagist | All versions to 1.5.2 | None |

## How do I fix CVE-2026-52841?

No fix has been published for CVE-2026-52841 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-52841 being exploited?

There is no known exploitation of CVE-2026-52841 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-52841 and fix it if it is affected.

What it is: CVE-2026-52841 is a low-severity missing authorization vulnerability in alextselegidis easyappointments, published on 14 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-52841 in the wild and no public exploit code.

Affected packages and fixed versions:
- alextselegidis/easyappointments (Packagist): affected all versions up to 1.5.2; no fix listed
- alextselegidis/easyappointments (Packagist): affected all versions up to 1.5.2; no fix listed

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-2026-52841/ (Markdown: https://insights.sbomify.com/CVE-2026-52841/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-52841
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-52841
- OSV: https://osv.dev/vulnerability/CVE-2026-52841

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-52841/
Summaries are generated and may contain mistakes; the official description above is the record.