What’s Vulnerable › Vulnerabilities

CVE-2017-15891

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-12-08 · updated 2026-06-17
• Weakness: CWE-284

Description

Improper access control vulnerability in SYNO.Cal.EventBase in Synology Calendar before 2.0.1-0242 allows remote authenticated users to modify calendar event via unspecified vectors.

Affected products

• Synology Calendar: before 2.0.1-0242 — fixed in 2.0.1-0242

How to fix

Upgrade to a fixed version: Synology Calendar 2.0.1-0242. Check the vendor advisory for mitigations.

References

• https://www.synology.com/en-global/support/security/Synology_SA_17_68_Calendar
• https://www.synology.com/en-global/support/security/Synology_SA_17_68_Calendar

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