Microsoft disclosed a big distant code execution (RCE) vulnerability in its Groups collaboration software program as a part of its August 2025 Patch Tuesday updates.
The vital flaw, recognized as CVE-2025-53783, may permit an unauthorized attacker to learn, write, and even delete consumer messages and information by executing code over a community.
The vulnerability is a heap-based buffer overflow, a kind of reminiscence corruption weak spot the place an utility could be pressured to retailer information past the allotted reminiscence house on the heap.
An attacker may exploit this flaw to overwrite vital information or execute malicious code inside the context of the Groups utility.
In response to Microsoft, a profitable exploit may have a excessive influence on the confidentiality, integrity, and availability of a consumer’s information, granting the attacker privileges to learn, write, and delete data.
Microsoft has assigned the vulnerability a CVSS 3.1 rating of seven.5, score its severity as “Essential.” The corporate notes that exploiting this flaw has a excessive diploma of complexity (AC: H), requiring an attacker to assemble particular details about the goal’s surroundings.
Microsoft Groups RCE Vulnerability
Moreover, consumer interplay is required for a profitable assault, which means a goal would possible must click on a malicious hyperlink or open a specifically crafted file.
As of the announcement, the vulnerability has not been publicly disclosed or actively exploited. Microsoft’s exploitability evaluation signifies that exploitation is “Much less Probably.”
The corporate has already issued an official repair and is urging customers and directors to use the most recent safety updates to mitigate the chance.
This Groups vulnerability was one among 107 flaws addressed on this month’s Patch Tuesday launch, which additionally included a repair for a publicly disclosed zero-day vulnerability in Home windows Kerberos.
The intensive month-to-month patch is a reminder of the persistent safety challenges dealing with main enterprise software program platforms. In latest months, Microsoft has additionally contended with vital vulnerabilities in its SharePoint servers, a few of which have been reported to be actively exploited.
Whereas this particular Groups RCE flaw requires a fancy assault chain, previous vulnerabilities in enterprise messaging apps have proven the potential for widespread influence.
Related exploits in platforms like Groups and Slack have, in some circumstances, been “wormable,” permitting them to unfold mechanically from one compromised account to a whole group.
Given the potential for full information compromise, safety consultants advocate that each one organizations utilizing Microsoft Groups prioritize the deployment of the August 2025 safety updates instantly.
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