What is CVE-2022-22686?

CVE-2022-22686 is a medium-severity vulnerability in Synology Calendar, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2022-07-26.

How severe is CVE-2022-22686?

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

CSRF in Synology Calendar

CVE-2022-22686

Cross-Site Request Forgery (CSRF) vulnerability in webapi component in Synology Calendar before 2.3.4-0631 allows remote authenticated users to hijack the authentication of administrators via unspecified vectors.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2022-07-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.003 (23.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Synology Calendar
Synology Calendar — versions unspecified

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

www.synology.com/security/advisory/Synology_SA_20_07 (Vendor Advisory)

Frequently asked questions

What is CVE-2022-22686?: CVE-2022-22686 is a medium-severity vulnerability in Synology Calendar, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2022-07-26.
How severe is CVE-2022-22686?: Medium severity. CVSS v3 base score is 6.5 out of 10.