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Flextype CMS CVE-2026-91751

| EUVDEUVD-2026-78233 HIGH
Path Traversal (CWE-22)
2026-09-15 VulnCheck GHSA-63h9-h8w7-v6fr
7.2
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
7.2 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/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
8.8 HIGH

Network REST API access (AV:N), trivial traversal mechanics (AC:L), valid API token required (PR:L); arbitrary file read justifies C:H not C:L.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Sep 15, 2026 - 07:24 vuln.today
CVE Published
Sep 15, 2026 - 00:35 cve.org
HIGH 7.2

DescriptionCVE.org

Flextype CMS through 1.0.0-alpha.3 fails to properly validate id and new_id parameters in the Entries REST API, allowing API token holders to read, create, or overwrite files outside the entries directory. Attackers can use traversal sequences in API requests to escape the project entries directory and manipulate arbitrary files and directories on the filesystem.

AnalysisAI

Path traversal in Flextype CMS through 1.0.0-alpha.3 allows API token holders to escape the designated entries directory and read, create, or overwrite arbitrary files accessible to the web server process. The Entries REST API accepts unsanitized id and new_id parameters and passes them directly into filesystem operations, permitting traversal sequences such as '../../' to resolve paths outside the intended content tree. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires possession of a valid Flextype Entries REST API token - without one, the API endpoint rejects requests and traversal is not reachable. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 7.2 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H) correctly captures network reachability, low attack complexity, and the authentication prerequisite of a valid API token (PR:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patched version has been identified at time of analysis; operators should monitor the GitHub issue tracker at https://github.com/flextype/flextype/issues/596 for an official fix. … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-91751 vulnerability details – vuln.today

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