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RCE Exploit for WordPress via libheif Vulnerability Disclosed

RCE Exploit for WordPress via libheif Vulnerability Disclosed

First seen 5 Oct 2026, 18:08 UTC • •
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ThreatCluster AI
ThreatCluster •October 5, 2026 at 18:09 UTC
  • •Critical RCE exploit for WordPress via libheif vulnerability disclosed.
  • •Authenticated users can exploit the flaw to execute arbitrary code.
  • •Public exploit chain released, highlighting the urgency for patching.

A remote code execution (RCE) exploit affecting WordPress installations has been publicly disclosed by Fortbridge. The vulnerability, tracked as GHSA-x8r2-mggj-j6wr, is a heap buffer overflow in the libheif library, which processes HEIC images. It allows authenticated users with upload capabilities to execute arbitrary code on the server. The flaw was discovered during a WordPress 7.1 assessment by Alex Thomas from Wordfence on September 1, 2026, and a public exploit chain was released on October 5, 2026. The vulnerability affects any WordPress site that allows image uploads and has not yet been assigned a CVE. Although a patch was released in libheif 1.23.3, the exploit remains a significant threat due to its potential for. Fortbridge has demonstrated the exploit's effectiveness, showcasing the ability to control execution flow through crafted image files.

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Timeline

2026-09-01
Vulnerability discovered
Alex Thomas from Wordfence identified a critical heap overflow in libheif during a WordPress assessment.
Cyberkendra
2026-09-22
CVE-2026-87902 published
A related vulnerability was published with a CVSS score of 8.1, indicating high severity.
Cyberkendra
2026-10-05
Public exploit chain released
Fortbridge published a working exploit for the libheif vulnerability, demonstrating its potential for RCE.
Cyberkendra

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Common questions

Which versions of WordPress are affected?
Any WordPress installation that allows HEIC image uploads is potentially affected.
Is there a patch available?
Yes, libheif 1.23.3 includes a fix for the vulnerability, but not all WordPress installations may have applied it.
What should I do if I'm affected?
Immediately update libheif to version 1.23.3 and review user permissions for image uploads.