Vulnerability · Published Aug 25, 2026 · Assigned by TYPO3
CVE-2026-77130Insufficient Session Expiration in extension "SYSSY - TYPO3 Monitoring & Security Checks" (syssy)
Medium 5.3
In plain English
A medium-severity security flaw in Extension "SYSSY - TYPO3 Monitoring & Security Checks" from TYPO3. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).
Severity (CVSS 4.0)5.3Medium
Exploit odds (30 days)0.4%top 71.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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. Exploitation requires the attacker to already be in control of the SYSSY project's API key.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TYPO3 | Extension "SYSSY - TYPO3 Monitoring & Security Checks" | 0 – before 3.0.6 |
Weakness: CWE-613 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
References
- https://typo3.org/security/advisory/typo3-ext-sa-2026-015 vendor-advisory