CODESYS Development System up to 3.5.21.40 Temporary Directory default permission

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in CODESYS Development System. Affected by this issue is some unknown functionality of the component Temporary Directory Handler. Performing a manipulation results in default permission. This vulnerability is cataloged as CVE-2026-44469. The attack must be initiated from a local position. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in CODESYS Development System. This affects some unknown functionality of the component Temporary Directory Handler. The manipulation with an unknown input leads to a default permission vulnerability. CWE is classifying the issue as CWE-276. During installation, installed file permissions are set to allow anyone to modify those files. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The affected product extracts installation files to a temporary directory with incorrect default permissions during administrative installation. A low-privileged local attacker can exploit a TOCTOU race condition with a practical time window to replace verified files with malicious ones before installation, resulting in local privilege escalation.

The weakness was shared by David Ruscheweyh as VDE-2026-055. It is possible to read the advisory at certvde.com. This vulnerability is uniquely identified as CVE-2026-44469 since 05/06/2026. The exploitability is told 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 T1222 according to MITRE ATT&CK.

Upgrading to version 3.5.22.20 eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-31797) and CERT Bund (WID-SEC-2026-1675). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • CODESYS CODESYS

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.2

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

NVD Base Score: 7.0
NVD Vector: 🔒

CNA Base Score: 7.8
CNA Vector (CERTVDE): 🔒

CVSSv2info

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

Exploitinginfo

Class: Default permission
CWE: CWE-276 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

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: Development System 3.5.22.20

Timelineinfo

05/06/2026 CVE reserved
05/26/2026 +20 days Advisory disclosed
05/26/2026 +0 days VulDB entry created
06/01/2026 +6 days VulDB entry last update

Sourcesinfo

Advisory: VDE-2026-055
Researcher: David Ruscheweyh
Status: Confirmed

CVE: CVE-2026-44469 (🔒)
GCVE (CVE): GCVE-0-2026-44469
GCVE (VulDB): GCVE-100-365619
EUVD: 🔒
CERT Bund: WID-SEC-2026-1675 - CODESYS: Mehrere Schwachstellen

Entryinfo

Created: 05/26/2026 11:41
Updated: 06/01/2026 12:46
Changes: 05/26/2026 11:41 (78), 05/26/2026 13:56 (1), 05/27/2026 10:14 (7), 06/01/2026 12:46 (10)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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