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CVE-2026-13639 is an insufficient-entropy vulnerability in the login logic of Synology DiskStation Manager (DSM). A remote, unauthenticated attacker can exploit the flaw to read or write arbitrary files and cause denial of service. Affected releases include DSM versions before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, and 7.4-90075.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An insufficient-entropy flaw (CWE-331) in Synology DiskStation Manager login logic that can allow unauthenticated remote attackers to read or write arbitrary files and cause denial of service. The listed CVSS v3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
A CVSS 9.8 unauthenticated remote insufficient-entropy vulnerability in Synology DiskStation Manager login logic. Predictable session tokens can permit an attacker to forge an administrative session and obtain arbitrary file read/write capability and denial of service.
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.