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


- **Severity:** Medium 6.0 (`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`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 6 Nov 2026
- **Updated:** 11 Nov 2026
- **Also known as:** GHSA-8pjw-rf82-7c57, GHSA-q77r-9mjq-mjw6

## What is CVE-2026-123486?

CVE-2026-123486 is a medium-severity vulnerability in WWBN AVideo, published on 6 Nov 2026. 

### Official 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.

Weakness: CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition)

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


## How do I fix CVE-2026-123486?

No fix has been published for CVE-2026-123486 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-123486 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-123486 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-123486 and fix it if it is affected.

What it is: CVE-2026-123486 is a medium-severity vulnerability in WWBN AVideo, published on 6 Nov 2026. 
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-123486 exists.

Affected product: WWBN AVideo. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-123486/ (Markdown: https://insights.sbomify.com/CVE-2026-123486/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-123486
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-123486
- OSV: https://osv.dev/vulnerability/CVE-2026-123486

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-123486/
Summaries are generated and may contain mistakes; the official description above is the record.