AVideo: IDOR in PayPalYPT Plugin Allows Any Authenticated User to Cancel Arbitrary PayPal Subscription Agreements

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.2 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L

EPSS

• CVE-2026-43883: 0.20% estimated exploitation activity in the next 30 days; percentile 9.96 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary 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. Details AVideo's PayPalYPT plugin ships two near-duplicate endpoints that cancel a PayPal billing agreement. Only one of them enforces ownership: - plugin/PayPalYPT/PayPalAgreementCancel.json.php:19 — correctly requires either admin or the agreement's owner: - plugin/PayPalYPT/agreementCancel.json.php:9-26 — only checks User::isLogged() (in fact twice, redundantly) and then calls the cancellation directly: PayPalYPT::cancelAgreement() at plugin/PayPalYPT/PayPalYPT.php:548-566 resolves the agreement ID against PayPal and calls…

Published by the source

5 May 2026, 22:16 UTC

Last modified by the source

13 May 2026, 14:20 UTC

Source last checked

26 Oct 2026, 14:40 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-958h-qp3x-q4gj

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# Patch Next advisory brief: CVE-2026-43883

Advisory: AVideo: IDOR in PayPalYPT Plugin Allows Any Authenticated User to Cancel Arbitrary PayPal Subscription Agreements
IDs: CVE-2026-43883, GHSA-958h-qp3x-q4gj
Record: https://patchnext.com/advisories/cve-2026-43883 (revision 1, source checked 26 Oct 2026, 14:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist wwbn/avideo: affected <= 29.0

## Suggested inspection (read-only)
- Packagist wwbn/avideo: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on wwbn/avideo.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-958h-qp3x-q4gj (GitHub-reviewed advisory GHSA-958h-qp3x-q4gj lists affected ranges: Packagist wwbn/avideo >=0 <=29.0)

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