# CVE-2026-13039: Eventin 4.0.26 - 4.1.15 - Missing Authorization to Unauthenticated Payment Bypass via REST API

> Unauthenticated attackers can bypass payment checks to obtain paid event tickets and access by exploiting missing authorization in the REST API.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Jul 2026
- **Updated:** 13 Jul 2026
- **Also known as:** GHSA-xcc9-4v86-gf8f

## What is CVE-2026-13039?

CVE-2026-13039 is a medium-severity missing authorization vulnerability in arraytics Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered), published on 10 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered) plugin for WordPress is vulnerable to authorization bypass due to a regression in versions from 4.0.26 up to and including 4.1.15. This is due to the plugin not properly verifying that a user is authorized to perform an action in the payment_complete() function of PaymentController.php. This makes it possible for unauthenticated attackers to mark unpaid ticket orders as completed by submitting a fabricated SureCart checkout ID or FluentCart cart hash, granting themselves paid event access, QR-code attendee tickets, and order confirmation emails without making any real payment. The wp_rest nonce required to reach the vulnerable endpoint is embedded in every public event page, meaning no WordPress session or credentials are needed to obtain it. This vulnerability represents a regression — the same function and endpoint were previously patched but the fix did not persist through subsequent releases.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-13039?


## How do I fix CVE-2026-13039?

No fix has been published for CVE-2026-13039 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-13039 being exploited?

There is no known exploitation of CVE-2026-13039 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13039 and fix it if it is affected.

What it is: CVE-2026-13039 is a medium-severity missing authorization vulnerability in arraytics Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered), published on 10 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-2026-13039 in the wild and no public exploit code.

Affected product: arraytics Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered). 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-2026-13039/ (Markdown: https://insights.sbomify.com/CVE-2026-13039/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13039
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13039
- OSV: https://osv.dev/vulnerability/CVE-2026-13039

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-13039/
Summaries are generated and may contain mistakes; the official description above is the record.