Medium severity · published Sep 16, 2026
CVE-2026-19857
Formidable Forms < 6.35 - Unauthenticated Arbitrary Shortcode Execution via [entry_key] Custom HTML Token
4.8
CVSS
0.2%
EPSS
No
On KEV
Description
The Formidable Forms WordPress plugin before 6.35 does not prevent a request-derived value from reaching the WordPress shortcode parser when it substitutes a supported token into a form's custom HTML, allowing unauthenticated visitors to have arbitrary shortcodes, with attacker-chosen attributes, executed server-side on any page displaying an affected form.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FF
Formidable Forms ·
6.34 before 6.35 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-19857
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-19857
wpscan.com
https://wpscan.com/vulnerability/5ff439f4-aa99-4198-b908-0cf098656cf7/
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