Subscription suspension via unchecked agreement ownership
Published May 11, 2026 · Updated May 11, 2026
Missing authorization in AVideo 29.0 and earlier allows remote authenticated users to suspend another user's PayPal subscription. The PayPalYPT agreementCancel.json.php endpoint passes an attacker-supplied agreement identifier to PayPalYPT::cancelAgreement without checking it against the logged-in user's ownership record. Any low-privilege account with a victim's agreement ID can stop recurring billing and terminate the victim's paid service.
Summary
What happened
Missing authorization in AVideo 29.0 and earlier allows remote authenticated users to suspend another user's PayPal subscription. The PayPalYPT agreementCancel.json.php endpoint passes an attacker-supplied agreement identifier to PayPalYPT::cancelAgreement without checking it against the logged-in user's ownership record. Any low-privilege account with a victim's agreement ID can stop recurring billing and terminate the victim's paid service.
The record
- CVE
- CVE-2026-43883
- Published
- May 11, 2026
- Updated
- May 11, 2026
- Vendor
- World Wide Broadcast Network
- Product
- AVideo
- Classifications
- CWE-639, T1565.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 11, 2026CVE publishedPublication date reported by the CVE source.
- May 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=<= 29.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Authenticated agreement-cancellation PoCproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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