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CVE-2026-52747

8.6 · HIGH

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx.

Published Jul 10, 2026CWE-180EPSS 0.48%

Overview

CVE-2026-52747 is a high-severity vulnerability. It was published on July 10, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 3.0.16, the multipart/form-data request body parser in libmodsecurity silently removes embedded line breaks from non-file form-field values before exporting them to ARGS and ARGS_POST because src/request_body_processor/multipart.cc overwrites reserved bytes in m_reserve instead of appending the current buffer. This creates a parser differential between ModSecurity and backend applications that preserve line breaks in form fields, allowing rules that inspect ARGS or ARGS_POST to miss payloads whose dangerous syntax depends on a line break. This issue is fixed in version 3.0.16.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/owasp-modsecurity/ModSecurity/commit/875504c2758169c41be1ad2f0cc64d896b7815d7GitHubgithub.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16GitHubgithub.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-rcw9-2f5r-7p88GitHubgithub.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-rcw9-2f5r-7p88

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52747?

CVE-2026-52747 is a high-severity vulnerability. It was published on July 10, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-52747?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-52747?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-52747?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52747 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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