Security readout for executives and security teams
Plain-English summary
Synology Calendar before 2.3.4-0631 has a CSRF flaw that can let a remote authenticated user abuse an administrator's authenticated browser session. Business risk is moderate because admin context is involved, but the public record does not show active exploitation.
Executive priority
Treat this as a moderate-priority patching item. It is not cited as actively exploited, but administrator session abuse can create operational risk if vulnerable Calendar instances remain in use.
Technical view
CVE-2022-22686 is a CWE-352 CSRF issue in the Synology Calendar webapi component. CVSS 3.1 score is 6.5 with network access, low complexity, low privileges, required user interaction, changed scope, and low confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to deployments running Synology Calendar before 2.3.4-0631. Risk is higher where multiple users authenticate to Calendar and administrators use active browser sessions to manage the service.
Exploitation context
The source bundle lists KEV as false and provides no cited evidence of active exploitation. The described attack requires an authenticated remote user and administrator user interaction, but the public description leaves the exact vector unspecified.
Researcher notes
Evidence is sparse: the CVE identifies CSRF in webapi and says vectors are unspecified. Do not infer affected Synology products beyond Synology Calendar. Validation should focus on version state, access model, and administrator activity review.
Mitigation direction
- Upgrade Synology Calendar to 2.3.4-0631 or later.
- Review Synology advisory Synology_SA_20_07 for product-specific guidance.
- Limit administrator use to trusted sessions and trusted sites until updated.
- Reduce unnecessary access to Synology Calendar for untrusted users.
Validation and detection
- Inventory Synology Calendar deployments and record installed package versions.
- Confirm no deployment remains below version 2.3.4-0631.
- Review administrator activity for unexpected Calendar or account changes.
- Confirm administrators have ended old sessions after remediation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2022-22686 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L2.33.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/security/advisory/Synology_SA_20_07CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.