The US cybersecurity agency CISA is calling attention to two more vulnerabilities in the messaging application TeleMessage TM SGNL, urging organizations to patch them immediately.
An application that allows users to archive messages sent using WhatsApp, Telegram, and Signal, TeleMessage landed in the spotlight recently, after Trump’s former national security advisor Mike Waltz was seen using it on his phone. Tens of government workers were later found to have been using the application.
Shortly after, Oregon-based communications company Smarsh, which owns the Israel-based TeleMessage, suspended all TeleMessage services after hackers demonstrated that lack of encryption allowed them to obtain chat logs.
The weakness, tracked as CVE-2025-47729 (CVSS score of 4.9), was added to CISA’s Known Exploited Vulnerabilities (KEV) catalog in mid-May.
Now, CISA says two other security defects in the TeleMessage service, tracked as CVE-2025-48927 and CVE-2025-48928, have been exploited by hackers.
According to a NIST advisory, the former exists because the monitoring tool Spring Boot Actuator is configured with an exposed heap dump endpoint.
The latter is due the TeleMessage service being “based on a JSP application in which the heap content is roughly equivalent to a ‘core dump’ in which a password previously sent over HTTP would be included in this dump,” a NIST advisory explains.
NIST marked both flaws as “exploited in the wild in May 2025”, after hackers explained how the use of JSP, a two-decade-old technology, and the exposed heap dump endpoint allowed them to obtain a snapshot of the server’s memory, which exposed the user credentials.
The whole process took roughly 20 minutes, the hackers told Wired, proving how risky the TeleMessage service was.
On Tuesday, CISA added both CVE-2025-48927 and CVE-2025-48928 to KEV, urging federal agencies to patch them by July 22, as mandated by Binding Operational Directive (BOD) 22-01.
Although the directive only applies to federal agencies, all organizations are advised to patch their TeleMessage applications as soon as possible.
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