CVE-2026-78337Network attack vector

Authenticated stored XSS via unvalidated SVG logo upload

Published Aug 24, 2026 · Updated Aug 24, 2026

Stored cross-site scripting in Roskus Prospero Flow CRM before 5.15.13 allows remote authenticated users to execute JavaScript via an SVG logo. CompanySaveController::save() accepts the logo field without type, extension, or size validation, derives a filename extension from the content, and stores it on the public disk. Users with create company and update company permissions can plant the file; JavaScript runs in the application origin when any visitor opens its public URL.

CVSS severity4.8
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored cross-site scripting in Roskus Prospero Flow CRM before 5.15.13 allows remote authenticated users to execute JavaScript via an SVG logo. CompanySaveController::save() accepts the logo field without type, extension, or size validation, derives a filename extension from the content, and stores it on the public disk. Users with create company and update company permissions can plant the file; JavaScript runs in the application origin when any visitor opens its public URL.

The record

CVE
CVE-2026-78337
Published
Aug 24, 2026
Updated
Aug 24, 2026
Vendor
Roskus
Product
Prospero Flow CRM
Classifications
CWE-434, CWE-79, CAPEC-592, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <5.15.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Roskus · Prospero Flow CRMversion=0 <5.15.13

Published CVSS scores

4.8Secur0 CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo