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CVE-2025-10659: MegaSys Enterprises Telenium Online Web Application OS Command Injection

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-30 · updated 2026-06-17
• Weakness: CWE-78

Description

The Telenium Online Web Application is vulnerable due to a PHP endpoint accessible to unauthenticated network users that improperly handles user-supplied input. This vulnerability occurs due to the insecure termination of a regular expression check within the endpoint. Because the input is not correctly validated or sanitized, an unauthenticated attacker can inject arbitrary operating system commands through a crafted HTTP request, leading to remote code execution on the server in the context of the web application service account.

Affected products

• MegaSys Telenium Online Web Application:: through 8.4.21

References

• https://support.portal.megasys.com/
• https://www.cisa.gov/news-events/ics-advisories/icsa-25-273-01

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