Synology DSM flaws enable remote code execution
Multiple vulnerabilities in Synology Mail Station, PHP, and Calendar components allow remote code execution across DSM 6.2 through 7.2.
Sourcecert.cyber.gouv.fr — open the original
What to check
- Applies to
- The 2 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-109618 and CVE-2026-109619 as exploited in the wild.
CERT-FR issued an advisory covering multiple vulnerabilities affecting various Synology DSM components, including Mail Station, bundled PHP interpreters (versions 7.4 through 8.4), and Synology Calendar. These flaws allow an attacker to achieve remote code execution on affected systems. The advisory references Synology's own security bulletin (Synology_SA_26_14) and a prior CERT-FR alert (CERTFR-2026-ALE-014), indicating the vulnerabilities were considered significant enough to warrant an earlier standalone alert before this consolidated advisory.
Affected versions span DSM 6.2, 7.0, 7.1, and 7.2 across the listed components, with specific patched versions provided for each. Two CVEs are referenced: CVE-2026-109618 and CVE-2026-109619, though the advisory does not provide detailed technical descriptions of each flaw's root cause. Defenders running Synology NAS devices should prioritize patching given the remote code execution impact and the fact that a dedicated CERT-FR alert preceded this advisory, suggesting elevated concern or known exploitation potential.
No explicit statement of in-the-wild exploitation is given in this advisory text, but the existence of a prior ALE-level alert from CERT-FR (reserved for higher-urgency issues) suggests this may be under active attention. Administrators should apply the vendor-supplied patches referenced in the Synology security bulletin immediately and verify DSM, Mail Station, PHP, and Calendar package versions against the fixed versions listed.
Mentioned in this report
Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1435
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