Security readout for executives and security teams
Plain-English summary
Synology Moments had a high-severity file upload flaw. An authenticated remote user could abuse path handling to place files outside the intended upload location. For exposed or shared Moments deployments, this can threaten confidentiality, integrity, and availability.
Executive priority
Treat this as a high-priority remediation for any still-running Synology Moments deployment. The business risk is highest where untrusted or many users can authenticate and upload content.
Technical view
CVE-2019-11826 is a CWE-23 relative path traversal issue in SYNO.PhotoTeam.Upload.Item in Synology Moments before 1.3.0-0691. The CVE states the name parameter can allow arbitrary file upload by remote authenticated users. CVSS 3.1 is 8.0 with high C/I/A impact.
Likely exposure
Exposure is limited to Synology Moments installations before 1.3.0-0691 where authenticated users can reach upload functionality. The CVSS vector indicates network access, low privileges, and user interaction are relevant conditions.
Exploitation context
The provided sources do not establish active exploitation, and this CVE is not marked KEV in the supplied bundle. Evidence supports authenticated arbitrary file upload risk, but not public exploitation status or weaponized activity.
Researcher notes
The core issue is relative path traversal through the upload item name parameter. Sources do not provide payload details, exploit maturity, or comprehensive affected CPEs, so validation should focus on versioning, exposure, permissions, and vendor advisory alignment.
Mitigation direction
- Upgrade Synology Moments to 1.3.0-0691 or later.
- Review Synology advisory Synology_SA_19_05 for vendor-specific update guidance.
- Restrict access to Moments to trusted users and networks.
- Audit accounts with upload permissions and remove unnecessary access.
- Monitor storage locations for unexpected uploaded files.
Validation and detection
- Inventory Synology Moments deployments and record installed versions.
- Confirm no instance is running a version before 1.3.0-0691.
- Verify upload functionality requires authentication and appropriate authorization.
- Review logs for suspicious authenticated upload activity.
- Check for unexpected files near Moments upload storage paths.
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-23: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-11826 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
- High
- CVSS
- 8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
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:U/C:H/I:H/A:H2.15.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/security/advisory/Synology_SA_19_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.
Relative Path Traversal
Relative Path Traversal represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.