As part of the August 2025 Patch Tuesday security updates, a critical Remote Code Execution (RCE) vulnerability in Microsoft’s Teams collaboration software has been patched.
The critical flaw, tracked as CVE-2025-53783, could allow an unauthorized attacker to read, write, and even delete user messages and data by executing code over a network. An attacker could exploit this flaw to overwrite critical data or execute malicious code within the Teams application.
Microsoft claims that a working exploit for this flaw could have significant consequences for the confidentiality, integrity, and accessibility of data of a user, allowing the attacker to gain read, write, and delete rights to data.
The vulnerability is a heap buffer overflow, a type of memory corruption weakness in which an application can be forced to store data beyond the allocated memory space.
The company emphasizes that exploiting this flaw has a high degree of complexity (AC:H), which requires the attacker to gather specific information about the target environment.
Furthermore, a successful attack requires user interaction, meaning the target would likely have to click on a link malicious or open a specially crafted file.
At the time of the disclosure, the security flaw had not been publicly disclosed or actively exploited. Microsoft’s exploitability assessment is considered “Less Plausible.”
The company has already released an official fix and encourages users and administrators to apply the latest security updates to mitigate the risk.
This Teams vulnerability was one of 107 vulnerabilities addressed in this month’s Patch Tuesday release, which also included a fix for a publicly disclosed zero-day vulnerability in Windows Kerberos.
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