Missing XPC Client & NSXPC endpoint validation leads to privilege escalation in Vienna Assistant (MacOS) - Vienna Symphonic Library

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-24068
StatePUBLISHED
AssignerSEC-VLab
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-26 11:16:20 UTC
Updated2026-04-03 06:16:06 UTC
DescriptionThe VSL privileged helper does utilize NSXPC for IPC. The implementation of the "shouldAcceptNewConnection" function, which is used by the NSXPC framework to validate if a client should be allowed to connect to the XPC listener, does not validate clients at all. This means that any process can connect to this service using the configured protocol. A malicious process is able to call all the functions defined in the corresponding HelperToolProtocol. No validation is performed in the functions "writeReceiptFile" and “runUninstaller” of the HelperToolProtocol. This allows an attacker to write files to any location with any data as well as execute any file with any arguments. Any process can call these functions because of the missing XPC client validation described before. The abuse of the missing endpoint validation leads to privilege escalation.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-306 | CWE-306 CWE-306 Missing authentication for critical function

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Vienna Symphonic Library GmbH Vienna Assistant affected 1.2.542 MacOS

References

ReferenceSourceLinkTags
seclists.org/fulldisclosure/2026/Apr/3 af854a3a-2127-422b-91ae-364da2661108 seclists.org
r.sec-consult.com/vsl 551230f0-3615-47bd-b7cc-93e92e730bbf r.sec-consult.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Florian Haselsteiner, SEC Consult Vulnerability Lab (en)

Additional Advisory Data

Solutions

CNA: The vendor was unresponsive and did not respond to any of our communication attempts. Therefore, a patch is not available. In case you are using this product, please approach the vendor and demand a fix.

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