Security readout for executives and security teams
Plain-English summary
CVE-2018-8910 is a stored cross-site scripting issue in Synology Drive Attachment Preview. An authenticated user could upload a malicious attachment that runs script when another user previews it. Business risk is moderate because exploitation requires an account and user interaction, but it can still affect data confidentiality, integrity, and availability in shared Drive environments.
Executive priority
Prioritize remediation for shared Synology Drive systems with broad user access. This is not a critical unauthenticated takeover issue, but it can create business risk where compromised or low-trust accounts can target other users.
Technical view
Synology Drive before 1.0.1-10253 is affected by CWE-79 in Attachment Preview. The CVSS 3.0 vector is AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L, reflecting network reachability, low attack complexity, required privileges, required user interaction, and changed scope.
Likely exposure
Exposure is likely limited to organizations running Synology Drive versions earlier than 1.0.1-10253, especially where multiple authenticated users can upload and preview attachments.
Exploitation context
The provided sources do not show known active exploitation. The CVE is not listed as KEV in the supplied bundle. Exploitation requires an authenticated user and a victim who interacts with a malicious attachment preview.
Researcher notes
Evidence is limited to the CVE record and Synology advisory reference. The affected component is Attachment Preview, and the attack path involves malicious attachments. Do not assume unauthenticated exploitation, specific payload behavior, or broader Synology product impact from the supplied sources.
Mitigation direction
- Upgrade Synology Drive to 1.0.1-10253 or later per Synology guidance.
- Review Synology advisory SA-18:05 for product-specific update instructions.
- Limit Drive access to trusted authenticated users until updated.
- Reduce unnecessary attachment sharing or preview workflows on outdated systems.
Validation and detection
- Inventory Synology Drive installations and record exact installed versions.
- Confirm all instances run 1.0.1-10253 or a later fixed version.
- Identify systems where authenticated users can upload shared attachments.
- Review access logs for suspicious attachment-preview activity if available.
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-2018-8910 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_05CVE 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.