EUVD-2026-67225
GHSA-2g3f-q348-c747
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/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
PR:L reflects required Seller-role authentication; UI:R and S:C capture stored XSS victim-interaction and cross-user session impact; no availability impact.
Primary rating from Vendor (Secur0).
CVSS VectorVendor: Secur0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/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
Lifecycle Timeline
2DescriptionCVE.org
Unrestricted Upload of File with Dangerous Type in the product photo upload in Roskus Prospero Flow CRM before 5.16.0 allows an authenticated user holding the create product permission (routine Seller role) to execute arbitrary JavaScript in the application origin. The photo validation rule classifies the file only by its content (magic bytes) and rejects only a fixed list of PHP extensions, while ProductSaveController::save() names the stored file using the client-supplied extension and copies it into the public web root. A file that begins with an image header and carries an HTML extension passes validation, is stored under public/asset/upload/product/, and is served with a text/html content type, turning the upload into first-party stored script execution.
AnalysisAI
Stored cross-site scripting in Roskus Prospero Flow CRM before 5.16.0 allows an authenticated Seller-role user to achieve first-party script execution in other users' browser sessions by exploiting an extension-confusion flaw in the product photo upload feature. The application validates file content via magic bytes and rejects known PHP extensions, but then names the stored file using the attacker-supplied client extension - allowing a file prefixed with an image header and carrying an .html extension to pass validation, land in the public web root, and be served as text/html. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an active authenticated session with the 'create product' permission, which the description maps to the routine Seller role - this is not an administrative or elevated privilege, meaning any standard sales user qualifies. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:A) produces a score of 4.8, reflecting medium severity moderated by two significant prerequisites: the attacker must hold an authenticated Seller role (PR:L) and a victim user must actively view the product listing or detail page (UI:A). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker authenticates to the CRM with a legitimate Seller account (or a compromised one), crafts a file that begins with a valid JPEG magic-byte sequence (FF D8 FF) but is named payload.html and contains an HTML body with an embedded script tag. The file passes the server's image/mimes validation because the content check sees image bytes, but the stored filename becomes <uuid>.html and is accessible at a predictable URL under public/asset/upload/product/. … |
| Remediation | Upgrade Roskus Prospero Flow CRM to version 5.16.0 or later, which incorporates the fix committed at https://github.com/Roskus/prospero-flow-crm/commit/71b20e1a37f4381d1b8b0a6933a942324e1cc19f. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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