Security readout for executives and security teams
Plain-English summary
Synology Note Station before 2.5.3-0863 has a cross-site scripting flaw. An attacker with some access could inject script or HTML through a Note Station parameter, potentially affecting another user's browser session if they interact with malicious content.
Executive priority
Treat as a moderate-priority remediation for any exposed or multi-user Note Station deployment. It is not KEV-listed, but XSS can still affect user trust, data handling, and session safety in collaborative systems.
Technical view
CVE-2019-11827 is CWE-79 in SYNO.NoteStation.Shard. The object_id parameter does not sufficiently neutralize script or HTML input. CVSS 3.1 is 6.5 with network access, low privileges, user interaction, and changed scope.
Likely exposure
Exposure is limited to organizations running Synology Note Station versions earlier than 2.5.3-0863. The CVSS vector indicates low privileges and user interaction are required, so risk depends on who can access Note Station and whether users trust shared content.
Exploitation context
The provided bundle does not identify active exploitation, and KEV status is false. The issue is remotely reachable in the application context, but exploitation is not described as unauthenticated and requires user interaction per CVSS.
Researcher notes
The source bundle identifies the vulnerable component, parameter, CWE, CVSS, and fixed-version boundary. It does not provide payloads, affected DSM versions, compensating controls, or evidence of exploitation, so validation should focus on version and exposure.
Mitigation direction
- Upgrade Synology Note Station to 2.5.3-0863 or later.
- Review Synology advisory Synology-SA-19:08 for product-specific guidance.
- Restrict Note Station access to trusted users and networks where feasible.
- Monitor vendor support channels for any newer replacement guidance.
Validation and detection
- Inventory Synology Note Station deployments and package versions.
- Confirm every instance is running 2.5.3-0863 or later.
- Check whether Note Station is exposed beyond trusted users or networks.
- Review application logs for unusual Note Station requests involving object_id.
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-2019-11827 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_19_08CVE 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.