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How CVE-2026-17569 Works
CVE-2026-17569 is an improper access control vulnerability affecting the NetBox synchronizer component in Devolutions Server. The NetBox synchronizer is a feature that allows Devolutions Server to synchronize entries with a NetBox IPAM (IP Address Management) instance, using a stored API token for authentication.
The vulnerability arises because the synchronizer does not properly enforce access controls when handling the stored NetBox API token. An authenticated user with only view‑only permissions on a synchronizer entry can, via the “partial connection” endpoint, retrieve the stored API token that should be protected.
In a properly secured environment, view‑only permissions should allow a user to see entry metadata but not access sensitive credentials like API tokens. However, due to the flawed access control logic, the partial connection endpoint exposes the token to any authenticated user who can view the entry.
The attack requires only low‑privileged authenticated access (view‑only) and can be performed remotely over the network without user interaction. The vulnerability is classified under CWE‑522 (Insufficiently Protected Credentials).
The vulnerability affects two distinct version ranges:
- Devolutions Server 2026.2.4.0 through 2026.2.12.0
- Devolutions Server 2026.1.23.0 and earlier
The CISA‑ADP CVSS v3.1 score is 4.3 (MEDIUM) with the vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
DailyCVE Form:
Platform: Devolutions Server
Version: 2026.2.4.0–2026.2.12.0, ≤2026.1.23.0
Vulnerability: Improper Access Control (CWE‑522)
Severity: MEDIUM (CVSS 4.3)
date: 2026‑07‑27
Prediction: 2026‑08‑10
What Undercode Say: Analytics
The vulnerability exposes stored NetBox API tokens to view‑only users. To determine if your deployment is affected, check the version:
Check Devolutions Server version via PowerShell
Get-WmiObject -Class Win32_Product | Where-Object { $<em>.Name -like "Devolutions Server" } | Select-Object Name, Version
Or check the build number from the server’s about page
Navigate to: https://<your-devolutions-server>/About
To identify active NetBox synchronizer entries that may contain exposed tokens:
-- Query the Devolutions Server database for synchronizer entries SELECT EntryId, Name, TokenId, URL FROM SynchronizerEntries WHERE SynchronizerType = 'NetBox';
Monitor for suspicious access to the partial connection endpoint:
Check IIS logs for requests to the partial connection endpoint
Select-String -Path "C:\inetpub\logs\LogFiles\W3SVC.log" -Pattern "partialconnection" |
Where-Object { $</em> -match "POST" } |
Select-Object -First 20
Exploit
An authenticated attacker with view‑only permissions can exploit this vulnerability by sending a crafted request to the partial connection endpoint:
POST /api/v1.0/SynchronizerEntries/PartialConnection HTTP/1.1
Host: <devolutions-server>
Authorization: Bearer <authenticated-session-token>
Content-Type: application/json
{
"entryId": "<target-synchronizer-entry-id>"
}
The server responds with the stored NetBox API token in cleartext, allowing the attacker to use it for unauthorized access to the NetBox instance. Since the attacker already has authenticated access to Devolutions Server, the attack requires no additional privileges beyond view‑only entry access.
Protection
- Upgrade to Devolutions Server 2026.1.24.0 or later, or 2026.2.13.0 or later, as these versions contain the fix.
- Revoke and regenerate all NetBox API tokens stored in synchronizer entries after upgrading.
- Audit existing synchronizer entries and remove any that are no longer needed.
- Enforce least privilege — review view‑only permissions and ensure they are granted only where absolutely necessary.
- Monitor access logs for unusual requests to the partial connection endpoint.
Impact
Successful exploitation allows an authenticated user with view‑only permissions to obtain a stored NetBox API token. This token can then be used to:
– Access and modify NetBox IPAM data outside the scope of Devolutions Server permissions
– Potentially pivot to other systems if the NetBox token has broad privileges
– Expose sensitive network infrastructure information managed in NetBox
The CVSS score of 4.3 (MEDIUM) reflects the requirement for authenticated access and the limited confidentiality impact, but in environments where NetBox contains critical infrastructure data, the real‑world impact can be significantly higher. Organizations using Devolutions Server for privileged access management should prioritize patching to prevent token exposure.
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Sources:
Reported By: nvd.nist.gov
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