Critical [CVE-2026-109618 +1] Synology-SA-26:14 PHP2Shell
This critical-severity Synology advisory covers CVE-2026-109618 and CVE-2026-109619 affecting Synology Calendar, Mail Station, PHP 7.3.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations. This bulletin covers 2 CVEs; its score, affected versions and guidance may apply to different issues within that bulletin.
VulniPulse record published
Summary
Multiple vulnerabilities allow remote attackers to execute arbitrary code via susceptible versions of the following packages in DSM: Synology Calendar Hyper Backup Mail Station PHP 7.3, PHP 7.4, PHP 8.0, PHP 8.1, PHP 8.2, PHP 8.3, and PHP 8.4 Please refer to the ‘
CISA Known Exploited Vulnerability
- Listed:
- Oct 26, 2026 · federal remediation due Oct 29, 2026
- Required action:
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
KEV is a prioritization signal from CISA. Remediation detail comes from the vendor advisory.
- Synology Calendar before 3.0.4-21435
- Synology Calendar before 2.4.8-10948
- Synology Calendar before 2.4.8-0948
- Mail Station before 30000002.3.19-20333
- Mail Station before 30000002.3.19-10333
- Mail Station before 30000002.3.19-0333
- PHP 7.4 before 7.4.33-0131
- PHP 7.4 before 7.4.33-0122
- PHP 7.4 before 7.4.33-0010
- PHP 8.0 before 8.0.30-0122
- PHP 8.0 before 8.0.30-0104
- PHP 8.1 before 8.1.34-0120
- PHP 8.2 before 8.2.35-0171
- PHP 8.3 before 8.3.36-0051
- PHP 8.4 before 8.4.27-0051
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 3.0.4-21435
- 2.4.8-10948
- 2.4.8-0948
- 30000002.3.19-20333
- 30000002.3.19-10333
- 30000002.3.19-0333
- 7.4.33-0131
- 7.4.33-0122
- 7.4.33-0010
- 8.0.30-0122
- 8.0.30-0104
- 8.1.34-0120
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Upgrade the affected Synology product to a fixed release: 3.0.4-21435, 2.4.8-10948, 2.4.8-0948, 30000002.3.19-20333, 30000002.3.19-10333, 30000002.3.19-0333.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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