# CVE-2026-43883: AVideo: IDOR in PayPalYPT Plugin Allows Any Authenticated User to Cancel Arbitrary PayPal Subscription Agreements

> Authenticated users can cancel arbitrary PayPal subscriptions by manipulating agreement IDs, causing service loss and revenue impact.

- **Severity:** Medium 4.2 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 May 2026
- **Updated:** 12 May 2026
- **Also known as:** GHSA-958h-qp3x-q4gj

## What is CVE-2026-43883?

CVE-2026-43883 is a medium-severity missing authorization vulnerability in WWBN AVideo, published on 11 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

WWBN AVideo is an open source video platform. In versions up to and including 29.0, plugin/PayPalYPT/agreementCancel.json.php cancels a PayPal billing agreement using an attacker-supplied agreement parameter without verifying that the authenticated user owns the agreement. A low-privilege authenticated user who learns or obtains another user's PayPal billing agreement ID can silently suspend the victim's recurring subscription, causing revenue loss to the platform and loss of paid service to the victim. Commit 0da3dcff1eda2f497694bf82b559829471c292c2 contains an updated fix.

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

## Which versions are affected by CVE-2026-43883?

2 open source packages ship an affected version, including wwbn/avideo.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `wwbn/avideo` | Packagist | All versions to 29.0 | None |
| `wwbn/avideo` | Packagist | All versions to 29.0 | None |

## How do I fix CVE-2026-43883?

No fix has been published for CVE-2026-43883 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-43883 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43883 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-43883 and fix it if it is affected.

What it is: CVE-2026-43883 is a medium-severity missing authorization vulnerability in WWBN AVideo, published on 11 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43883 exists.

Affected packages and fixed versions:
- wwbn/avideo (Packagist): affected all versions up to 29.0; no fix listed
- wwbn/avideo (Packagist): affected all versions up to 29.0; 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-2026-43883/ (Markdown: https://insights.sbomify.com/CVE-2026-43883/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-43883
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-43883
- OSV: https://osv.dev/vulnerability/CVE-2026-43883

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-43883/
Summaries are generated and may contain mistakes; the official description above is the record.