Exploitation reportedNot in CISA KEV yet

CVE-2026-3300

Exploitation reported by one source. First attested on 2026-06-05 by GCVE · kevintel.

Published2026-03-31
WeaknessCWE-94

Am I 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 Everest Forms Pro plugin for WordPress is vulnerable to Remote Code Execution via PHP Code Injection in all versions up to, and including, 1.9.12. This is due to the Calculation Addon's process_filter() function concatenating user-submitted form field values into a PHP code string without proper escaping before passing it to eval(). The sanitize_text_field() function applied to input does not escape single quotes or other PHP code context characters. This makes it possible for unauthenticated attackers to inject and execute arbitrary PHP code on the server by submitting a crafted value in any string-type form field (text, email, URL, select, radio) when a form uses the "Complex Calculation" feature.

Timeline

dates in UTC

2026-03-3102:15CVE publishedNVD
2026-06-0509:20Listed as exploited by GCVEGCVE
2026-06-0509:20Exploitation first reportedGCVE
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-3300?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-3300?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-2026-3300 yet.

Full record on NVD

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
Exploit-DB: no entry
Proof-of-concept repositories: 2 repositories, unverifiedHORKimhab/CVE-2026-3300adamshaikhma/CVE-2026-3300

Sources

NVDCVE recordread 2026-10-23
GCVEexploitation2026-06-05
CISA-ADPSSVC decisionnone2026-03-31
OpenCVESSVC decisionnone—
CNACVSS 3.19.8read 2026-10-23
CNAweakness (CWE)CWE-94read 2026-10-23
FIRST EPSSEPSS score4.4 %2026-10-22
PoC-in-GitHubproof of concept2read 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: 2026-03-31
Last Modified: 2026-06-17
NVD status: Deferred

Frequently asked questions

What is CVE-2026-3300?

Is CVE-2026-3300 actively exploited?

Active exploitation of CVE-2026-3300 has not been confirmed. Its EPSS score was 4.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-3300?

CVE-2026-3300 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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