VDB-360996 · CVE-2026-25863 · EUVD-2026-27083

Jules Colle Conditional Fields for Contact Form 7 up to 2.7.2 on WordPress REST API Endpoint hide_hidden_mail_fields_regex_callback improper validation of specified quantity in input

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Jules Colle Conditional Fields for Contact Form 7 up to 2.7.2 on WordPress. It has been declared as problematic. This impacts the function hide_hidden_mail_fields_regex_callback of the component REST API Endpoint. The manipulation results in improper validation of specified quantity in input. This vulnerability is identified as CVE-2026-25863. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Jules Colle Conditional Fields for Contact Form 7 up to 2.7.2 on WordPress. It has been classified as problematic. Affected is the function hide_hidden_mail_fields_regex_callback of the component REST API Endpoint. The manipulation with an unknown input leads to a improper validation of specified quantity in input vulnerability. CWE is classifying the issue as CWE-1284. The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties. This is going to have an impact on availability. CVE summarizes:

Conditional Fields for Contact Form 7 WordPress plugin through version 2.7.2 contains an uncontrolled resource consumption vulnerability in the Wpcf7cfMailParser class where the hide_hidden_mail_fields_regex_callback() method reads an iteration count directly from user-supplied POST parameters without validation or upper bound enforcement. Unauthenticated attackers can supply an arbitrarily large integer value through the REST API endpoint to cause unbounded loop execution with multiple preg_replace() operations, exhausting server memory and crashing the PHP process.

The weakness was released by Rahul Karne. The advisory is shared for download at wordpress.org. This vulnerability is traded as CVE-2026-25863 since 02/06/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 2.7.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-27083). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

WordPress Plugin

Vendor

Jules Colle

Name

Conditional Fields for Contact Form 7

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (VulnCheck): 🔒

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper validation of specified quantity in input
CWE: CWE-1284 / CWE-703
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Conditional Fields for Contact Form 7 2.7.3

Timelineinfo

02/06/2026 CVE reserved
05/04/2026 +86 days Advisory disclosed
05/04/2026 +0 days VulDB entry created
05/27/2026 +23 days VulDB entry last update

Sourcesinfo

Advisory: wordpress.org
Researcher: Rahul Karne
Status: Confirmed

CVE: CVE-2026-25863 (🔒)
GCVE (CVE): GCVE-0-2026-25863
GCVE (VulDB): GCVE-100-360996
EUVD: 🔒

Entryinfo

Created: 05/04/2026 22:42
Updated: 05/27/2026 07:36
Changes: 05/04/2026 22:42 (79), 05/05/2026 06:28 (1), 05/27/2026 07:36 (1)
Complete: 🔍
Cache ID: 216::103