Medium severity · published Oct 12, 2026
CVE-2026-109396
Thelia before 3.1.2 and 3.2.x before 3.2.1 CSV Formula Injection via Exports
4.2
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TH
Thelia · Thelia
before 3.1.2; 3.2.0 before 3.2.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109396
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109396
vendor-advisory
https://github.com/thelia/thelia/security/advisories/GHSA-gcgv-f8rf-w2wc
patch
https://github.com/thelia/thelia/commit/c00a26f0631ed9de3c4466176db6e808a25034aa
patch
https://github.com/thelia/thelia/commit/6e46059225d87565caf4859ec0f764354e82ce95
technical-description
https://github.com/thelia/thelia/blob/3.2.0/core/lib/Thelia/Core/Serializer/Serializer/CSVSerializer.php
release-notes
https://github.com/thelia/thelia/releases/tag/3.1.2
release-notes
https://github.com/thelia/thelia/releases/tag/3.2.1
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