What is CVE-2018-8915?

CVE-2018-8915 is a medium-severity vulnerability in Synology Calendar, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2018-05-10.

How severe is CVE-2018-8915?

Medium severity. CVSS v3 base score is 6.5 out of 10.

XSS in Synology Calendar

CVE-2018-8915

Cross-site scripting (XSS) vulnerability in Notification Center in Synology Calendar before 2.1.1-0502 allows remote authenticated users to inject arbitrary web script or HTML via title parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-05-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.008 (55.1th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Synology Calendar — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.synology.com/en-global/support/security/Synology_SA_18_06 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-8915?: CVE-2018-8915 is a medium-severity vulnerability in Synology Calendar, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2018-05-10.
How severe is CVE-2018-8915?: Medium severity. CVSS v3 base score is 6.5 out of 10.