CVE-2026-59239: Stored XSS in Prospero Flow CRM email body allows administrator account takeover
Stored Cross-site Scripting (CWE-79) in the email module in Roskus Prospero Flow CRM before 5.4.4 allows a remote, authenticated low-privileged user to execute arbitrary JavaScript in another user's browser, including administrators, leading to session compromise and account takeover, via a payload stored in an email body that is persisted without sanitization and rendered unescaped with {!! $email->body !!} when the recipient opens the message.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Roskus Prospero Flow CRMto a version that resolves this vulnerability.Fixed in 5.4.4
Event History
Frequently Asked Questions
What is the severity of CVE-2026-59239?
CVE-2026-59239 has a severity rating of high, with a CVSS score of 8.6.
How does CVE-2026-59239 allow account takeover?
CVE-2026-59239 allows a low-privileged authenticated user to execute arbitrary JavaScript in another user's browser, including administrators, leading to session compromise.
What versions of Roskus Prospero Flow CRM are affected by CVE-2026-59239?
CVE-2026-59239 affects versions of Roskus Prospero Flow CRM prior to 5.4.4.
How can I mitigate the risk associated with CVE-2026-59239?
To mitigate the risk of CVE-2026-59239, it is crucial to upgrade Roskus Prospero Flow CRM to version 5.4.4 or later.
What type of vulnerability is CVE-2026-59239 categorized as?
CVE-2026-59239 is categorized as a Stored Cross-site Scripting (XSS) vulnerability.