CVE-2026-43883: CWE-639: Authorization Bypass Through User-Controlled Key in WWBN AVideo
WWBN AVideo versions up to and including 29.0 contain an authorization bypass vulnerability in the PayPal billing agreement cancellation endpoint. A low-privilege authenticated user can supply another user's PayPal billing agreement ID to cancel that user's recurring subscription without ownership verification. This can lead to revenue loss for the platform and loss of paid service for the victim. A fix has been committed but no official patch or vendor advisory is currently confirmed.
AI Analysis
Technical Summary
CVE-2026-43883 is an authorization bypass vulnerability (CWE-639) in WWBN AVideo's plugin/PayPalYPT/agreementCancel.json.php endpoint. The endpoint cancels PayPal billing agreements based on a user-supplied agreement parameter without verifying that the authenticated user owns the agreement. This allows a low-privilege authenticated user who knows or obtains another user's billing agreement ID to cancel that agreement, disrupting the victim's recurring payments. The issue affects versions up to 29.0. A code commit (0da3dcff1eda2f497694bf82b559829471c292c2) contains a fix, but no official patch or vendor advisory is provided in the data.
Potential Impact
An attacker with low-level authenticated access can cancel other users' PayPal billing agreements, causing interruption of paid subscriptions and resulting in revenue loss for the platform and service loss for affected users. The CVSS score is 4.2 (medium severity), reflecting low complexity but limited impact confined to integrity and availability of billing agreements.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The fix is present in a specific commit, indicating a code-level resolution exists, but no official patch or update release is confirmed. Until an official patch is available, restrict access to the vulnerable endpoint and monitor for suspicious cancellation requests if possible.
CVE-2026-43883: CWE-639: Authorization Bypass Through User-Controlled Key in WWBN AVideo
Description
WWBN AVideo versions up to and including 29.0 contain an authorization bypass vulnerability in the PayPal billing agreement cancellation endpoint. A low-privilege authenticated user can supply another user's PayPal billing agreement ID to cancel that user's recurring subscription without ownership verification. This can lead to revenue loss for the platform and loss of paid service for the victim. A fix has been committed but no official patch or vendor advisory is currently confirmed.
CVSS v3.1
Score 4.2medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-43883 is an authorization bypass vulnerability (CWE-639) in WWBN AVideo's plugin/PayPalYPT/agreementCancel.json.php endpoint. The endpoint cancels PayPal billing agreements based on a user-supplied agreement parameter without verifying that the authenticated user owns the agreement. This allows a low-privilege authenticated user who knows or obtains another user's billing agreement ID to cancel that agreement, disrupting the victim's recurring payments. The issue affects versions up to 29.0. A code commit (0da3dcff1eda2f497694bf82b559829471c292c2) contains a fix, but no official patch or vendor advisory is provided in the data.
Potential Impact
An attacker with low-level authenticated access can cancel other users' PayPal billing agreements, causing interruption of paid subscriptions and resulting in revenue loss for the platform and service loss for affected users. The CVSS score is 4.2 (medium severity), reflecting low complexity but limited impact confined to integrity and availability of billing agreements.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The fix is present in a specific commit, indicating a code-level resolution exists, but no official patch or update release is confirmed. Until an official patch is available, restrict access to the vulnerable endpoint and monitor for suspicious cancellation requests if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-04T15:17:09.329Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a028749cbff5d86108b51af
Added to database: 05/12/2026, 01:50:01 UTC
Last enriched: 05/19/2026, 10:54:03 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 76
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