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Frauscher FDS 102 CVE-2026-14949

| EUVDEUVD-2026-63220 HIGH
Incorrect Authorization (CWE-863)
2026-08-20 CERTVDE GHSA-ffgp-8f3g-q5h7
PHP Authentication Bypass Fds 102
8.5
CVSS 4.0 · Vendor: CERTVDE
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Severity by source

Vendor (CERTVDE) PRIMARY
8.5 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.9 CRITICAL

Network-reachable API, low complexity, low-privilege session required; scope changed because admin access impacts connected field hardware beyond the application itself.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H

Primary rating from Vendor (CERTVDE).

CVSS VectorVendor: CERTVDE

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 20, 2026 - 09:04 vuln.today
CVE Published
Aug 20, 2026 - 08:19 cve.org
HIGH 8.5

DescriptionCVE.org

A low privileged remote attacker with a valid session can submit a request to the user creation functionality exposed through /api/user/add.php to create new accounts with arbitrary role values, including the highest privilege level used by the application.

AnalysisAI

Privilege escalation in Frauscher FDS 102 (versions 2.11.0 through 2.13.3) allows a low-privileged authenticated attacker to create new user accounts with arbitrary role values - including the application's highest privilege level - by submitting a crafted request to the PHP endpoint /api/user/add.php. The user creation API fails to enforce authorization on the role parameter (CWE-863: Incorrect Authorization), permitting authenticated non-admins to self-elevate or plant backdoor admin accounts. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain low-privileged FDS 102 credentials
Delivery
Authenticate to establish valid session
Exploit
Craft POST request to /api/user/add.php with admin role value
Execution
Server creates admin account without authorization check
Persist
Authenticate as new admin account
Impact
Access or modify connected railway field device configuration
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid, active session for any authenticated account on the FDS 102 instance, regardless of that account's assigned role - low-privileged operator or technician accounts are sufficient. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.5 with vector AV:N/AC:L/AT:N/PR:L/UI:N reflects a network-accessible, low-complexity exploit requiring only a valid low-privileged session - a realistic precondition in environments where operator-level accounts are distributed to field technicians. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained a valid low-privileged FDS 102 session - through credential theft, phishing a field technician, or reusing a default/weak password - sends a crafted POST request directly to /api/user/add.php, supplying a new username and the highest application role value in the role parameter. The server processes the request without verifying that the submitting user holds sufficient privileges to assign that role, creating a fully privileged backdoor administrator account. …
Remediation Consult the CERTVDE advisory VDE-2026-078 at https://www.certvde.com/en/advisories/VDE-2026-078/ for the official remediation guidance from Frauscher Sensortechnik, including any patched release version. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, conduct an inventory of all Frauscher FDS 102 deployments and identify instances running affected versions (2.11.0-2.13.3); simultaneously retrieve and audit user account creation logs, focusing on /api/user/add.php requests. …

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CVE-2026-14949 vulnerability details – vuln.today
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