Security readout for executives and security teams
Plain-English summary
CVE-2018-8928 is an authenticated cross-site scripting issue in Synology CardDAV Server. A logged-in attacker could place malicious script or HTML in address book name fields, affecting another user who views the edited contact. The business risk is mainly account/session compromise and data exposure in the CardDAV web interface.
Executive priority
Treat this as a scheduled remediation item unless the service is internet-accessible or shared with semi-trusted users. Patch affected Synology CardDAV Server installations and reduce unnecessary write permissions to limit business impact from browser-based compromise.
Technical view
Synology CardDAV Server before 6.0.8-0086 has CWE-79 XSS in Address Book Editor. The vulnerable inputs are family_name, given_name, and additional_name. CVSS 3.0 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 Synology deployments running CardDAV Server earlier than 6.0.8-0086, especially where untrusted or lower-privileged users can edit address book entries and other users access those entries through the web interface.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The vulnerability requires authentication and user interaction, reducing broad unauthenticated risk, but it remains relevant where multiple users share address books or administrative users view attacker-controlled contact data.
Researcher notes
The key evidence is the CVE description and Synology advisory reference. Affected version granularity is stated only as before 6.0.8-0086 with unspecified earlier versions. No exploit availability, mass exploitation, or additional affected products are supported by the provided sources.
Mitigation direction
- Upgrade Synology CardDAV Server to 6.0.8-0086 or later.
- Restrict CardDAV Server access to trusted users until patched.
- Review address book permissions for unnecessary write access.
- Check Synology advisory guidance for any environment-specific instructions.
Validation and detection
- Inventory Synology systems running CardDAV Server.
- Confirm installed CardDAV Server version is 6.0.8-0086 or later.
- Identify users allowed to edit shared address books.
- Review recent contact-field changes from low-trust accounts.
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-79: 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-2018-8928 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 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/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:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L2.33.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.5MediumVector: CVSS:3.0/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/en-global/support/security/Synology_SA_18_10CVE 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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.