Retrospective for 2026-09-21, compiled on 27 October 2026. The date identifies the day being analysed; source publication and revision dates are recorded below.
What this advisory changes in your environment
The starting point is CERTFR-2026-AVI-1209, published on 2026-09-21. Its scope includes DSM. Reported consequences are denial of service, cross-site scripting (XSS), remote code execution, data integrity compromise, SQL injection, impact requiring vendor clarification, security control bypass, loss of confidentiality. These statements apply to the advisory’s scope; they do not assign every consequence to every product or CVE.
This case focuses on DSM. Locate that edition in live installations, deployment images and actual dependencies, rather than treating every product from Synology as equivalent.
Products and versions to examine
- Reference
- CERTFR-2026-AVI-1209
- Source first published
- 2026-09-21
- Latest source revision available for this day
- 2026-09-21
- Named components
- DSM
- CVE identifiers
- CVE-2026-13639, CVE-2026-6205, CVE-2026-13683, CVE-2026-13666, CVE-2026-13623, CVE-2026-13635, CVE-2026-13673, CVE-2026-13684
| Component | Published condition |
|---|---|
| DSM | 7.2.2 : < 7.2.2-72806-9 |
| DSM | 7.4.x : < 7.4-90075 |
| DSM | 7.3 : < 7.3.2-86009-4 |
| DSM | 7.2.1 : < 7.2.1-69057-12 |
For DSM, the published condition is “7.2.2 : < 7.2.2-72806-9”. Compare the version actually loaded with that condition within its own release branch. A fix installed on another edition of DSM does not close this case.
Mechanism and prerequisites
SQL injection breaks the boundary between data and instructions. Check parameterised queries, database account privileges and relevant logs; a destructive payload is unnecessary to establish exposure.
The primary record CVE-2026-13639, published by synology, covers DiskStation Manager (DSM). The retained revision is dated 2026-09-18. Its scope is presented separately from the integrations and product groupings in CERTFR-2026-AVI-1209.
The published metric for CVE-2026-13639 is CVSS 3.1, 9.8/10. The vector below describes technical prerequisites; it does not measure attack frequency or the likelihood that your deployment is compromised.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack vector
- network
- Prior privileges
- none
- User interaction
- none
- Complexity
- low
- Weakness
- CWE-331
Choose the appropriate intervention
- Locate DSM instances, running releases and service owners. Record condition 7.2.2 : < 7.2.2-72806-9 in the ticket alongside reference CERTFR-2026-AVI-1209.
- Compare the installed branch with the vendor’s DSM release notes. Prepare the package for that branch and a dependent-service test, retaining the pre-change state.
- After changing DSM, capture the loaded version again and verify the workflow below. Any exception needs an owner, an exposure-reduction measure and an expiry date.
Verify the fix in a real workflow
Validation scenario to adapt for DSM: For DSM, restore a synthetic dataset into an isolated environment and compare it with a reference. Check the management plane separately from the recovery path; a successful backup status does not prove service recovery. This is a proposed defensive check, not a claim that testing was performed against third-party systems.
Limit of case CERTFR-2026-AVI-1209: this analysis replaces neither vendor prerequisites nor investigation of your logs. Only documented versions are reproduced; no attack date or victim is invented.
Questions specific to this case
Which condition should be checked for DSM?
Advisory CERTFR-2026-AVI-1209 states: DSM — 7.2.2 : < 7.2.2-72806-9. Check the edition and running release; do not extend the published boundary to branches absent from the advisory.
Which prerequisites does record CVE-2026-13639 specify?
For CVE-2026-13639, the published vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Verify those conditions on DiskStation Manager (DSM) before applying them to an integration named in CERTFR-2026-AVI-1209.
Sources and related reading
Practical guide : Test a backup restoration from copy to working service
Explore the decision addressed in this case
- Veeam ONE, Veeam Backup & Replication: restore access controls
- ONTAP 9 (formerly Clustered Data ONTAP): verify data integrity
Complete source advisory inventory
The article table may be an extract. These lists contain every affected-system entry and CVE in the specified advisory revision. They are not an inventory of your assets and do not map every CVE to every product.
Official source · CERTFR-2026-AVI-1209
Advisory revision : · Checked on :
Affected systems · 4
Original French wording is retained to avoid ambiguous translations of version conditions.
- DSM versions 7.2.2 antérieures à 7.2.2-72806-9
- DSM versions 7.4.x antérieures à 7.4-90075
- DSM versions 7.3 antérieures à 7.3.2-86009-4
- DSM versions 7.2.1 antérieures à 7.2.1-69057-12