ConnectWise ScreenConnect up to up to 26.1 Access Token improper validation of specified quantity in input

CVSS Meta Temp Score
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CTI Interest Score
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4.6$0-$5k1.39+

Summaryinfo

A vulnerability classified as problematic was found in ConnectWise ScreenConnect up to up to 26.1. Affected by this vulnerability is an unknown functionality of the component Access Token Handler. Executing a manipulation can lead to improper validation of specified quantity in input. This vulnerability is handled as CVE-2026-11596. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in ConnectWise ScreenConnect up to up to 26.1. This vulnerability affects an unknown function of the component Access Token Handler. The manipulation with an unknown input leads to a improper validation of specified quantity in input vulnerability. The CWE definition for the vulnerability is CWE-1284. The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In ScreenConnect™ versions prior to 26.2, input validation within the Host Pass creation functionality could allow an authenticated user with Host Pass creation privileges the ability to specify a token expiration duration beyond the intended maximum when generating delegated access tokens.

The weakness was released by Damian West. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-11596 since 06/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation needs additional levels of successful authentication. There are neither technical details nor an exploit publicly available.

Upgrading to version 26.2 eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.6

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.7
CNA Vector (ConnectWise): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper validation of specified quantity in input
CWE: CWE-1284 / CWE-703
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: ScreenConnect 26.2

Timelineinfo

06/08/2026 CVE reserved
06/10/2026 +2 days Advisory disclosed
06/10/2026 +0 days VulDB entry created
06/10/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Researcher: Damian West
Status: Confirmed

CVE: CVE-2026-11596 (🔒)
GCVE (CVE): GCVE-0-2026-11596
GCVE (VulDB): GCVE-100-370216

Entryinfo

Created: 06/10/2026 22:43
Changes: 06/10/2026 22:43 (65)
Complete: 🔍
Cache ID: 216::103

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