CVE-2026-59239Network attack vector

Account takeover via unsanitized stored HTML

Published Jul 27, 2026 · Updated Jul 27, 2026

Stored XSS in Roskus Prospero Flow CRM before 5.4.4 allows remote authenticated users to run JavaScript in another user's browser. EmailCreateService saved message bodies, and ProfileSaveController saved signature_html, without sanitization; the email view rendered body content as unescaped HTML. A low-privileged user must send a crafted message that a recipient opens; execution in an administrator's session enables account takeover.

CVSS severity8.6
High
EPSS probability0.38%
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 XSS in Roskus Prospero Flow CRM before 5.4.4 allows remote authenticated users to run JavaScript in another user's browser. EmailCreateService saved message bodies, and ProfileSaveController saved signature_html, without sanitization; the email view rendered body content as unescaped HTML. A low-privileged user must send a crafted message that a recipient opens; execution in an administrator's session enables account takeover.

The record

CVE
CVE-2026-59239
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Roskus
Product
Prospero Flow CRM
Classifications
CWE-79, CAPEC-592, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 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=1.0.0 <5.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Roskus · Prospero Flow CRMversion=1.0.0 <5.4.4

Published CVSS scores

8.6Secur0 CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1190Exploit Public-Facing Application

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