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Got a Synology NAS? Time to check your updates, as two high-level vulnerabilities let ne’er-do-wells read and write files and conduct DDOS attacks

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Got a Synology NAS? Time to check your updates, as two high-level vulnerabilities let ne’er-do-wells read and write files and conduct DDOS attacks

Another day, another cybersecurity update. This time, it's the turn of immensely popular NAS provider Synology to advise its users about some now-fixed gaping holes. The company has updated its DiskStation Manager (DSM) operating system, patching out two security vulnerabilities in various product versions.

Just another patch? Not quite. The first of these vulnerabilities has a CVSS3 base score of 9.8 out of 10, which makes it of "critical" severity (via International Cyber Digest on X). According to the company:

"An improper neutralization of special elements used in an SQL command vulnerability in the Auth API in Synology DiskStation Manager (DSM)... allows remote attackers to read or write arbitrary files and conduct denial-of-service attacks."

That's a pretty big security hole if I've ever seen one, particularly for those storing extremely important data on their home NAS setup. The second one gets a lower severity rating of 8.6, but also manages to allow attackers to skip the login process.

Synology describes the second vulnerability as "An authentication bypass using an alternate path or channel vulnerability in the rsync in Synology DiskStation Manager," which can again lead to unwanted reads, writes, and DDOS shenanigans.

‼️BREAKING: A critical flaw in Synology NAS devices lets attackers read and write any file on them without logging in.The SQL injection bug in their login system scores 9.8 out of 10. A second flaw, in rsync, skips the login too.Synology patched both today. Update ASAP. https://t.co/LlS328SBf4November 11, 2026

The company also notified users late last month of ransomware attacks related to a 2024 security advisory , for what looks to be a series of separate vulnerabilities.


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