Security readout for executives and security teams
Plain-English summary
CVE-2018-8918 is an XSS flaw in Synology Router Manager. An attacker with required access could inject script or HTML through the host parameter, potentially affecting users who interact with the vulnerable interface. The issue applies to SRM before 1.1.7-6941.
Executive priority
Treat this as a moderate-priority router management-plane issue. It is not known exploited from the supplied sources, but affected devices should be upgraded because router administration compromise can create broader operational risk.
Technical view
The vulnerability is CWE-79 in SRM info.cgi before version 1.1.7-6941. The published CVSS 3.0 score is 6.5, with network attack vector, low complexity, low privileges required, user interaction required, changed scope, and low confidentiality, integrity, and availability impact.
Likely exposure
Organizations using Synology Router Manager versions earlier than 1.1.7-6941 are potentially exposed. Risk is higher where SRM administration surfaces are reachable by untrusted networks or users.
Exploitation context
The source bundle does not report active exploitation, and the CVE is not marked as CISA KEV. Exploitation requires user interaction and low privileges according to the CVSS vector.
Researcher notes
Evidence is limited to the CVE record and Synology advisory reference. Do not assume affected models, exploit availability, or a specific XSS storage behavior from the provided bundle alone.
Mitigation direction
- Upgrade Synology Router Manager to 1.1.7-6941 or later.
- Review Synology advisory Synology_SA_18_25 for vendor-specific remediation.
- Restrict SRM management access to trusted administrators and networks.
- Remove unnecessary external exposure of SRM administration interfaces.
Validation and detection
- Inventory Synology routers and record installed SRM versions.
- Confirm no SRM device remains below 1.1.7-6941.
- Check whether SRM administration interfaces are exposed to untrusted networks.
- Review access controls for accounts allowed to reach SRM management pages.
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-2018-8918 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/security/advisory/Synology_SA_18_25CVE 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.