Vulnerability in Thelia
CVE-2026-109396
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.
Published .
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/thelia/thelia/security/advisories/GHSA-gcgv-f8rf-w2wc (vendor-advisory)
- github.com/thelia/thelia/commit/c00a26f0631ed9de3c4466176db6e808a25034aa (patch)
- github.com/thelia/thelia/commit/6e46059225d87565caf4859ec0f764354e82ce95 (patch)
- github.com/thelia/thelia/blob/3.2.0/core/lib/Thelia/Core/Serializer/Serializer/… (technical-description)
- github.com/thelia/thelia/releases/tag/3.1.2 (release-notes)
- github.com/thelia/thelia/releases/tag/3.2.1 (release-notes)
- www.vulncheck.com/advisories/thelia-before-3.1.2-and-3.2-x-before-3.2.1-csv-for… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109396?
- CVE-2026-109396 is a medium-severity vulnerability in Thelia, classified under Improper Neutralization of Formula Elements in a CSV File. CVSS score: 4.2/10. Published 2026-10-12.
- How severe is CVE-2026-109396?
- Medium severity. CVSS v3 base score is 4.2 out of 10.