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CVE-2026-109396

4.2 · MEDIUM

Thelia before 3.1.2 and 3.2.x before 3.2.1 contains a CSV formula injection vulnerability that allows unauthenticated visitors to inject spreadsheet formulas by supplying crafted registration, chec…

Published Oct 12, 2026CWE-1236EPSS 0.23%

Overview

CVE-2026-109396 is a medium-severity vulnerability. It was published on October 12, 2026 and has a CVSS 3.1 base score of 4.2 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.2, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Thelia before 3.1.2 and 3.2.x before 3.2.1 contains a CSV formula injection vulnerability that allows unauthenticated visitors to inject spreadsheet formulas by supplying crafted registration, checkout or newsletter fields. Attackers can submit names, addresses or phone values starting with =, +, - or @ that CSVSerializer exports verbatim, executing formulas in the administrator's spreadsheet application.

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/thelia/thelia/blob/3.2.0/core/lib/Thelia/Core/Serializer/Serializer/CSVSerializer.phpGitHubgithub.com/thelia/thelia/commit/6e46059225d87565caf4859ec0f764354e82ce95GitHubgithub.com/thelia/thelia/commit/c00a26f0631ed9de3c4466176db6e808a25034aaGitHubgithub.com/thelia/thelia/releases/tag/3.1.2GitHubgithub.com/thelia/thelia/releases/tag/3.2.1GitHubgithub.com/thelia/thelia/security/advisories/GHSA-gcgv-f8rf-w2wcRefwww.vulncheck.com/advisories/thelia-before-3.1.2-and-3.2-x-before-3.2.1-csv-formula-injection-via-exportsGitHubgithub.com/thelia/thelia/security/advisories/GHSA-gcgv-f8rf-w2wc

How CyberStrike helps

Frequently asked questions

What is CVE-2026-109396?

CVE-2026-109396 is a medium-severity vulnerability. It was published on October 12, 2026 and has a CVSS 3.1 base score of 4.2 (MEDIUM).

How severe is CVE-2026-109396?

This vulnerability has a CVSS 3.1 base score of 4.2, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-109396?

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-2026-109396?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-109396 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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