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CVE-2026-13135 is a moderate-severity vulnerability in Synology MailPlus Server on DiskStation Manager (DSM) that allows remote attackers to access internal services. The issue is mapped to CWE-923, Improper Restriction of Communication Channel to Intended Endpoints, indicating insufficient restriction of communication paths such that requests can reach backend or internal-only services that should not be exposed to the attacker. The available reporting identifies the affected product family as Synology MailPlus Server deployments on DSM 7.3, 7.2.2, and 7.2.1. Specific vulnerable functions or code paths were not provided in the supplied content.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A moderate-severity vulnerability in Synology MailPlus Server that can allow remote attackers to access internal services because of improper restrictions on communication channels.
A Synology MailPlus Server vulnerability that allows remote attackers to access internal services.
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.