# CVE-2026-59234: Authorization Bypass Through User-Controlled Key in Prospero Flow CRM calendar event deletion

> Authenticated attackers can delete other users' calendar events by manipulating the event ID, requiring a patch to enforce ownership checks.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Jul 2026
- **Updated:** 6 Jul 2026
- **Also known as:** GHSA-q2f8-hpwm-236j

## What is CVE-2026-59234?

CVE-2026-59234 is a medium-severity missing authorization vulnerability in Roskus Prospero Flow CRM, published on 3 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Authorization Bypass Through User-Controlled Key (CWE-639) in CalendarDeleteEventController (app/Http/Controllers/Calendar/CalendarDeleteEventController.php), exposed at GET /calendar/event/delete/{id}, in Prospero Flow CRM before 5.5.3 allows a remote, authenticated attacker to delete arbitrary calendar events belonging to other users by manipulating the {id} path parameter, because the delete handler resolves the record with Calendar::find($id)->delete() and performs no ownership check (no user_id/company_id scoping) before deletion. This results in unauthorized destruction of other users' calendar events across the platform.

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

## Which versions are affected by CVE-2026-59234?


## How do I fix CVE-2026-59234?

No fix has been published for CVE-2026-59234 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-59234 being exploited?

There is no known exploitation of CVE-2026-59234 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-59234 and fix it if it is affected.

What it is: CVE-2026-59234 is a medium-severity missing authorization vulnerability in Roskus Prospero Flow CRM, published on 3 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-59234 in the wild and no public exploit code.

Affected product: Roskus Prospero Flow CRM. 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-2026-59234/ (Markdown: https://insights.sbomify.com/CVE-2026-59234/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-59234
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-59234
- OSV: https://osv.dev/vulnerability/CVE-2026-59234

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-59234/
Summaries are generated and may contain mistakes; the official description above is the record.