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CVE-2026-24307 is an information disclosure vulnerability in Microsoft 365 Copilot caused by improper validation of a specified type of input. The issue affects the hosted M365 Copilot service and can be exploited by an unauthorized attacker over the network. Available classification data indicates the flaw arises from insufficient validation of attacker-controlled input in a way that can lead to unintended disclosure of information. The published CVSS v3.1 vector also indicates changed scope and user interaction requirements, suggesting exploitation occurs within a workflow where crafted input is processed by Copilot and results in exposure of data beyond the originally intended security boundary. Publicly available details do not identify the exact vulnerable function, parsing routine, or prompt-handling component.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously disclosed Microsoft 365 Copilot information disclosure vulnerability caused by improper input validation, mentioned as part of the vendor's 2026 security history.
An improper input validation vulnerability in Microsoft 365 Copilot that could allow an unauthorized attacker to disclose information over a network; the entry also lists a CVSS v3.1 vector indicating high confidentiality and integrity impact with user interaction required and scope changed.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.