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CVE-2019-12331

8.8 · HIGH

PHPOffice PhpSpreadsheet before 1.8.0 has an XXE issue.

Published Nov 7, 2019CWE-611EPSS 1.35%

Overview

CVE-2019-12331 is a high-severity vulnerability. It was published on November 7, 2019 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

PHPOffice PhpSpreadsheet before 1.8.0 has an XXE issue. The XmlScanner decodes the sheet1.xml from an .xlsx to utf-8 if something else than UTF-8 is declared in the header. This was a security measurement to prevent CVE-2018-19277 but the fix is not sufficient. By double-encoding the the xml payload to utf-7 it is possible to bypass the check for the string ‚<!ENTITY‘ and thus allowing for an xml external entity processing (XXE) attack.

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/PHPOffice/PhpSpreadsheet/blob/master/CHANGELOG.md#180---2019-07-01Refherolab.usd.de/security-advisories/usd-2019-0046/GitHubgithub.com/PHPOffice/PhpSpreadsheet/blob/master/CHANGELOG.md#180---2019-07-01Refherolab.usd.de/security-advisories/usd-2019-0046/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-12331?

CVE-2019-12331 is a high-severity vulnerability. It was published on November 7, 2019 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2019-12331?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2019-12331?

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-2019-12331?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-12331 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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