Time-of-check Time-of-use (TOCTOU) Race Condition in AVideo - CVE-2026-123486
Published: November 11, 2026 / Updated: November 13, 2026
Vulnerability identifier: #VU165936
CSH Severity: Low
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-123486
CWE-ID: CWE-367
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to obtain duplicate wallet credits and subscription time for one payment, potentially causing financial loss and unauthorized paid-content access.
The vulnerability exists due to a time-of-check time-of-use race condition in plugin/PayPalYPT/ipn.php when checking deduplication keys and inserting transaction records nonatomically without a unique constraint on recurring_payment_id. A remote user can concurrently replay a captured valid PayPal recurring-payment notification to trigger duplicate wallet credits and subscription renewals.
Affected software
AVideo
How to mitigate CVE-2026-123486
Install security update from vendor's website.
AVideo - update to 29.5.0