CVE-2026-6279
A public proof of concept exists; no exploitation attested.
- Published2026-05-21
- WeaknessCWE-74
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2. This is due to the `wp_conditional_tags` case in `Fusion_Builder_Conditional_Render_Helper::get_value()` passing attacker-controlled values from a base64-decoded JSON blob directly to `call_user_func()` without any allowlist validation. This is exploitable by unauthenticated attackers through the `fusion_get_widget_markup` AJAX endpoint, which is registered for non-privileged (unauthenticated) users via `wp_ajax_nopriv_fusion_get_widget_markup`. The endpoint is protected only by a nonce (`fusion_load_nonce`), but this nonce is generated for user ID 0 and is deterministically exposed in the JavaScript output of any public-facing page containing a Post Cards (`[fusion_post_cards]`) or Table of Contents (`[fusion_table_of_contents]`) element. This makes it possible for unauthenticated attackers to execute arbitrary code on affected sites.
Timeline
dates in UTC- 2026-05-2105:16CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-6279?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-6279?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-6279 yet.
Fix
No fix published by the sources we read yet. NVD record
Detection
read 2026-10-23 19:25 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 5 repositories, unverifiedxxconi/CVE-2026-6279zycoder0day/CVE-2026-627987achrafg-stack/CVE-2026-6279.py87achrafg-stack/CVE-2026-6279katranSefa/CVE-2026-6279 PoC-in-GitHub
Sources
- NVDCVE recordread 2026-10-23
- CISA-ADPSSVC decisionnone2026-05-21
- OpenCVESSVC decisionnone—
- CNACVSS 3.19.8read 2026-10-23
- CNAweakness (CWE)CWE-74read 2026-10-23
- FIRST EPSSEPSS score7.2 %2026-10-22
- PoC-in-GitHubproof of concept5read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2026-05-21
- Last Modified
- 2026-07-23
- NVD status
- Deferred
Frequently asked questions
What is CVE-2026-6279?
Is CVE-2026-6279 actively exploited?
What is the CVSS score for CVE-2026-6279?
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