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CVE-2026-81931

Unrestricted upload of file with dangerous type in Prospero Flow CRM product photo allows stored cross-site scripting

MEDIUM
4.8
CVSS Score
Published: August 27, 2026 at 07:33 PM UTC
Updated: September 1, 2026 at 09:11 PM UTC
1 product affected across 1 vendorProspero Flow CRM

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Prospero Flow CRM· Roskus
60%
v < 5.16.0
Affected range stops below 5.16.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Patch
Source: cverecord
https://github.com/Roskus/prospero-flow-crm/commit/71b20e1a37f4381d1b8b0a6933a942324e1cc19f
Third Party AdvisoryTechnical Description
Source: cverecord
https://secur0.com/en/cna/cve-list/cve-2026-81931-unrestricted-upload-product-photo-extension-confusion-xss

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.8MEDIUMSecur0
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-434

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