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CVE-2026-88396: RCE Vulnerability in ApiAdmin v5.0 Disclosed

CVE-2026-88396: RCE Vulnerability in ApiAdmin v5.0 Disclosed

First seen 5 Oct 2026, 22:27 UTC • •
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ThreatCluster AI
ThreatCluster •October 5, 2026 at 22:27 UTC
  • •CVE-2026-88396 allows RCE via unvalidated file uploads in ApiAdmin v5.0.
  • •Proof-of-concept exploit code is publicly available, increasing risk for organizations.
  • •No active exploitation has been confirmed, but immediate patching is recommended.

On October 5, 2026, CVE-2026-88396 was disclosed, affecting ApiAdmin v5.0 and earlier versions. The vulnerability allows any logged-in admin user to upload a PHP file through the unprotected file-upload endpoint, enabling remote code execution (RCE) on the server. The flaw arises from a lack of validation on the file extension, allowing attackers to execute arbitrary PHP code. Although a proof-of-concept (PoC) exploit is publicly available, there are currently no reports of in the wild. Organizations using affected versions are advised to apply security patches immediately to mitigate the risk. The vulnerability has a CVSS score of 9.0, indicating a severity level. Security teams should monitor their systems for any signs of exploitation and ensure that they have updated to the latest version of the software.

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Timeline

2026-10-05
CVE-2026-88396 published
CVE-2026-88396 was disclosed, detailing a critical RCE vulnerability in ApiAdmin v5.0.
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Common questions

Which versions of ApiAdmin are affected?
ApiAdmin v5.0 and earlier versions are vulnerable to CVE-2026-88396.
Is there a patch available for this vulnerability?
Yes, organizations are advised to apply the latest security patches from the vendor.
What should I do if I can't patch immediately?
Monitor your systems for signs of exploitation and consider restricting access to the admin panel.