VIR Vulnerability Intelligence Relay

CVE-2017-15891

medium
Published 2017-12-08 · Modified 2026-05-13
CVSS v3
6.5
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS v2
4.0
VIR risk
6.5

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.

Predictions

Exploit likelihood
75%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: security@synology.com — https://www.synology.com/en-global/support/security/Synology_SA_17_68_Calendar

Application impact
VendorProductVersionsFixed
synologycalendar{"endExcluding":"2.0.1-0242"}2.0.1-0242

References

CWEs

CWE-284

Verify integrity in audit chain (admin only). AS-IS.