VDB-347503 · CVE-2026-3091 · SA_26_02

Synology Presto Client up to 2.1.3-0671 uncontrolled search path

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.9	$0-$5k	0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Synology Presto Client up to 2.1.3-0671. This affects an unknown part. This manipulation causes uncontrolled search path. This vulnerability appears as CVE-2026-3091. The attack requires local access. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Synology Presto Client up to 2.1.3-0671 and classified as critical. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a uncontrolled search path vulnerability. The CWE definition for the vulnerability is CWE-427. The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An uncontrolled search path element vulnerability in Synology Presto Client before 2.1.3-0672 allows local users to read or write arbitrary files and conduct denial-of-service during installation by placing a malicious DLL in advance in the same directory as the installer.

The weakness was presented by Sahil Shah as SA_26_02. It is possible to read the advisory at synology.com. This vulnerability is known as CVE-2026-3091 since 02/24/2026. The exploitation appears to be difficult. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1574 according to MITRE ATT&CK.

Upgrading to version 2.1.3-0672 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Synology

Name

Presto Client

Version

2.1.3-0671

License

commercial

Website

Vendor: https://www.synology.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.9

VulDB Base Score: 7.0
VulDB Temp Score: 6.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.3
NVD Vector: 🔒

CNA Base Score: 6.7
CNA Vector (synology): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uncontrolled search path
CWE: CWE-427 / CWE-426
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Presto Client 2.1.3-0672

Timelineinfo

02/24/2026 Advisory disclosed
02/24/2026 +0 days CVE reserved
02/24/2026 +0 days VulDB entry created
06/03/2026 +99 days VulDB entry last update

Sourcesinfo

Vendor: synology.com

Advisory: SA_26_02
Researcher: Sahil Shah
Status: Confirmed

CVE: CVE-2026-3091 (🔒)
GCVE (CVE): GCVE-0-2026-3091
GCVE (VulDB): GCVE-100-347503

Entryinfo

Created: 02/24/2026 07:48
Updated: 06/03/2026 04:09
Changes: 02/24/2026 07:48 (65), 03/04/2026 03:44 (11), 06/02/2026 14:49 (1), 06/03/2026 04:09 (5)
Complete: 🔍
Cache ID: 216::103