Vulnerability · Published Aug 25, 2026 · Assigned by TYPO3
CVE-2026-77131Cleartext Transmission of Sensitive Information 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 0.2% (higher than 16% of all known vulnerabilities).
Severity (CVSS 4.0)5.3Medium
Exploit odds (30 days)0.2%top 84.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
When OpenSSL is unavailable on the server, the extension transmits TYPO3 system information in cleartext instead of encrypting it. 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-319 · 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