What’s Vulnerable › Vulnerabilities

CVE-2018-8927

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-14 · updated 2026-06-17
• Weakness: CWE-863

Description

Improper authorization vulnerability in SYNO.Cal.Event in Calendar before 2.1.2-0511 allows remote authenticated users to create arbitrary events via the (1) cal_id or (2) original_cal_id parameter.

Affected products

• Synology Calendar: before 2.1.2-0511 — fixed in 2.1.2-0511

How to fix

Upgrade to a fixed version: Synology Calendar 2.1.2-0511. Check the vendor advisory for mitigations.

References

• https://www.synology.com/en-global/support/security/Synology_SA_18_16
• https://www.synology.com/en-global/support/security/Synology_SA_18_16

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