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CVE-2026-48579 is a critical information disclosure vulnerability in Microsoft Exchange Online caused by improper authorization. The flaw allows an unauthorized attacker to access information over the network without requiring prior authentication or user interaction. Available scoring metadata indicates low attack complexity and network reachability. The assigned CVSS v3.1 vector also indicates high confidentiality impact and high integrity impact, with no availability impact, suggesting the authorization failure can expose sensitive Exchange Online data and may permit unauthorized modification of protected information within the affected service context.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical information disclosure vulnerability in Microsoft Exchange Online caused by improper authorization.
A critical information disclosure vulnerability affecting Microsoft Exchange Online, with network attack vector, low attack complexity, no privileges required, and no user interaction.
An improper authorization vulnerability in Microsoft Exchange Online that allows an unauthorized network attacker to disclose information.
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.