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FeehiCMS CVE-2026-86241

| EUVDEUVD-2026-72190 LOW
Use of Hard-coded Cryptographic Key (CWE-321)
2026-09-07 VulDB GHSA-pqpw-2pq6-37xx
PHP Authentication Bypass Feehicms Liufee
2.1
CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY
2.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/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
8.2 HIGH

Key is empty/hardcoded and publicly known, requiring no auth or interaction; forging cookies enables auth bypass (I:H) with minor confidentiality exposure (C:L).

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

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

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

Lifecycle Timeline

6
Metadata Corrected
Sep 07, 2026 - 02:40 vuln.today
tag: Authentication Bypass added
Metadata Corrected
Sep 07, 2026 - 02:40 vuln.today
tag: Information Disclosure removed
Severity Changed
Sep 07, 2026 - 02:22 NVD
MEDIUM LOW
CVSS changed
Sep 07, 2026 - 02:22 NVD
5.3 (MEDIUM) 2.1 (LOW)
Analysis Generated
Sep 07, 2026 - 01:51 vuln.today
CVE Published
Sep 07, 2026 - 01:15 cve.org
MEDIUM 5.3

DescriptionCVE.org

A weakness has been identified in liufee FeehiCMS up to 2.1.1. This impacts an unknown function of the file environments/prod/backend/config/main-local.php of the component Cookie Validation. This manipulation of the argument cookieValidationKey causes use of hard-coded cryptographic key . The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

AnalysisAI

Cookie validation key forgery in liufee FeehiCMS up to 2.1.1 allows unauthenticated remote attackers to craft arbitrary signed cookies by exploiting a hardcoded (or empty) cookieValidationKey in the production backend configuration file environments/prod/backend/config/main-local.php. Because FeehiCMS is built on the Yii2 framework, this key is used for HMAC-based cookie integrity verification; a known or empty key trivially breaks that guarantee, enabling session/cookie forgery that can lead to authentication bypass and backend access. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires the target instance to be running FeehiCMS up to 2.1.1 with the default or unmodified `cookieValidationKey` (empty string or a static hardcoded value) in `environments/prod/backend/config/main-local.php`. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N) and score of 5.3 appear conservative and likely understated relative to the actual impact. … 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 patch has been identified at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-86241 vulnerability details – vuln.today
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