What’s Vulnerable › Vulnerabilities

CVE-2026-109396: Thelia before 3.1.2 and 3.2.x before 3.2.1 CSV Formula Injection via Exports

• Severity: medium (CVSS 4.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-12 · updated 2026-10-13
• Weakness: CWE-1236

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.

Affected products

• Thelia: before 3.1.2; from 3.2.0 before 3.2.1 — fixed in 3.1.2, 3.2.1

How to fix

Upgrade to a fixed version: Thelia 3.1.2, 3.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/thelia/thelia/blob/3.2.0/core/lib/Thelia/Core/Serializer/Serializer/CSVSerializer.php
• https://github.com/thelia/thelia/commit/6e46059225d87565caf4859ec0f764354e82ce95
• https://github.com/thelia/thelia/commit/c00a26f0631ed9de3c4466176db6e808a25034aa
• https://github.com/thelia/thelia/releases/tag/3.1.2
• https://github.com/thelia/thelia/releases/tag/3.2.1
• https://github.com/thelia/thelia/security/advisories/GHSA-gcgv-f8rf-w2wc
• https://www.vulncheck.com/advisories/thelia-before-3.1.2-and-3.2-x-before-3.2.1-csv-formula-injection-via-exports
• https://github.com/thelia/thelia/security/advisories/GHSA-gcgv-f8rf-w2wc

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