CVE-2026-25863Network attack vector

Unauthenticated service crash via unbounded POST iteration

Published May 4, 2026 · Updated May 4, 2026

Uncontrolled resource consumption in Jules Colle Conditional Fields for Contact Form 7 before 2.7.3 allows remote attackers to crash PHP processes. Wpcf7cfMailParser::hide_hidden_mail_fields_regex_callback() uses a repeater *_count POST value as a loop bound without validation, repeatedly invoking preg_replace(). An unauthenticated REST API submission can exhaust server memory and interrupt form processing and other PHP-backed requests in the affected process.

CVSS severity8.7
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Jules Colle Conditional Fields for Contact Form 7 before 2.7.3 allows remote attackers to crash PHP processes. Wpcf7cfMailParser::hide_hidden_mail_fields_regex_callback() uses a repeater *_count POST value as a loop bound without validation, repeatedly invoking preg_replace(). An unauthenticated REST API submission can exhaust server memory and interrupt form processing and other PHP-backed requests in the affected process.

The record

CVE
CVE-2026-25863
Published
May 4, 2026
Updated
May 4, 2026
Vendor
Jules Colle
Product
Conditional Fields for Contact Form 7
Classifications
CWE-1284, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 4, 2026CVE publishedPublication date reported by the CVE source.
  2. May 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jules Colle · Conditional Fields for Contact Form 7version=0 <2.7.3

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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