---
title: "CVE-2026-103521: Thelia - Remote Code Execution"
description: "Thelia v2.6.0 contains a remote code execution caused by lack of executable file type validation in the document update endpoint, letting attackers with admin permissions upload malicious executables, exploit requires admin privileges."
url: https://panop.io/threat-heartbeat/CVE-2026-103521/
---

# CVE-2026-103521 Thelia - Remote Code Execution

Thelia v2.6.0 contains a remote code execution caused by lack of executable file type validation in the document update endpoint, letting attackers with admin permissions upload malicious executables, exploit requires admin privileges.

CVSS base score 7.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.47% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-103521)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Published

12 October 2026

Updated

15 October 2026

Weakness

[CWE-434](https://cwe.mitre.org/data/definitions/434.html)

## Vendor fix

Update to the latest version with proper validation on document update endpoint.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-103521](https://nvd.nist.gov/vuln/detail/CVE-2026-103521)
- [https://kb.cert.org/vuls/id/162329](https://kb.cert.org/vuls/id/162329)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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