EUVD-2026-36674
GHSA-vv4x-qcpq-wgrg
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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
No-session endpoint requires no authentication (PR:N, AV:N); path traversal yields limited file read/write with no availability impact and no scope change.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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
Lifecycle Timeline
2DescriptionCVE.org
A weakness has been identified in Microweber up to 2.0.20. This affects the function userfiles_path of the file /api_nosession/thumbnail_img of the component API Endpoint. Executing a manipulation of the argument cache_path_relative can lead to path traversal. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
AnalysisAI
Path traversal in Microweber CMS up to version 2.0.20 exposes the unauthenticated /api_nosession/thumbnail_img endpoint to file system manipulation via the cache_path_relative parameter of the userfiles_path function. Remote, unauthenticated attackers can traverse outside the intended directory to read - and potentially write - files accessible to the web server process. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The `/api_nosession/thumbnail_img` endpoint is accessible without any authentication - the `nosession` designation in the endpoint path and the CVSS PR:N metric both confirm this. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score is 5.5 (Medium) with vector AV:N/AC:L/AT:N/PR:N/UI:N, confirming trivial network exploitation with no authentication, no complexity, and no user interaction required. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker sends an HTTP GET or POST request to the publicly accessible `/api_nosession/thumbnail_img` endpoint of a Microweber 2.0.20 installation with a crafted `cache_path_relative` value such as `../../../../etc/passwd`. The server's `userfiles_path` function processes the unsanitized traversal sequence and returns the content of the targeted file to the attacker. … |
| Remediation | No vendor-released patch has been identified at time of analysis - the vendor did not respond to the coordinated disclosure. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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