TYPO3-EXT-SA-2026-015: Multiple Vulnerabilities in extension "SYSSY - TYPO3 Monitoring & Security Checks" (syssy)
It has been discovered that the extension "SYSSY - TYPO3 Monitoring & Security Checks" (syssy) is vulnerable to Insufficient Session Expiration and Cleartext Transmission of Sensitive Information.
- Release Date: August 25, 2026
- Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
- Component: "SYSSY - TYPO3 Monitoring & Security Checks" (syssy)
- Composer Package Name: syssy/syssy-typo3-extension
- Vulnerability Type: Insufficient Session Expiration, Cleartext Transmission of Sensitive Information
- Affected Versions: 3.0.5 and below
- Severity: Medium
- Suggested CVSS v4.0: AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- References: CVE-2026-77130, CVE-2026-77131, CWE-613, CWE-319
Problem Description
The extension fails to properly validate the expiration of a client-supplied JWT token, allowing an attacker in control of a valid API key to authenticate with an expired token. (CVE-2026-77130)
Additionally, when OpenSSL is unavailable on the server, the extension transmits TYPO3 system information in cleartext instead of encrypting it. (CVE-2026-77131)
Exploitation requires the attacker to already be in control of the SYSSY project's API key.
Solution
An updated version 3.0.6 is available from the TYPO3 extension manager, packagist and at
https://extensions.typo3.org/extension/download/syssy/3.0.6/zip
Users of the extension are advised to update the extension as soon as possible.
Credits
Thanks to Ingrid Stürmer for reporting the vulnerability and for providing an updated version of the extension.
General Advice
Follow the recommendations that are given in the TYPO3 Security Guide.
