Security readout for executives and security teams
Plain-English summary
Synology Office versions before 3.1.4-2771 have an XSS flaw in Chart. An authenticated attacker could inject web script or HTML that runs when another user interacts with affected content. Business impact is mainly account or session exposure and misleading content inside the Office web application, not direct server takeover based on the cited sources.
Executive priority
Prioritize remediation in environments where Synology Office is internet-accessible or used by many semi-trusted users. The issue is medium severity, but collaboration platforms can amplify XSS impact through trusted documents and shared workflows.
Technical view
CVE-2019-11828 is CWE-79 in Synology Office Chart. The CVSS 3.1 vector is AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L, indicating network reachability, low privileges, user interaction, high attack complexity, changed scope, and limited confidentiality, integrity, and availability impact. Public sources do not specify the exact injection vector.
Likely exposure
Organizations are exposed if they run Synology Office earlier than 3.1.4-2771 and allow authenticated users to create or modify Chart content. Exposure is narrower where Office is not deployed, untrusted user accounts are absent, or access is tightly limited.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires authentication and user interaction, and the vector is unspecified. Treat this as a credible web application risk where Synology Office is used collaboratively.
Researcher notes
Public detail is limited: Synology identifies Chart in Office before 3.1.4-2771, but vectors are unspecified. Avoid assuming unauthenticated exploitability or broader Synology product impact. Validation should focus on version state, access paths, and safe confirmation of XSS controls.
Mitigation direction
- Upgrade Synology Office to 3.1.4-2771 or later.
- Check Synology’s advisory for current vendor guidance.
- Restrict Synology Office access to trusted users only.
- Review and remove unnecessary Office user privileges.
- Monitor for suspicious Office content or unexpected script-like entries.
Validation and detection
- Inventory Synology Office deployments and package versions.
- Confirm no instance is older than 3.1.4-2771.
- Identify users allowed to create or edit Chart content.
- Review Office-related logs for unusual authenticated activity.
- Document upgrade status and remaining access exceptions.
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-2019-11828 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
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/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:H/PR:L/UI:R/S:C/C:L/I:L/A:L1.33.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:N/AC:H/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_11CVE 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.