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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/Roskus/prospero-flow-crm/commit/32efcd5c395ee55119fb9aea502a…
4daa8cea-433a-44bd-9456-53b127fc289a
https://github.com/Roskus/prospero-flow-crm/releases
4daa8cea-433a-44bd-9456-53b127fc289a
https://secur0.com/en/cna/cve-list/cve-2026-59239-stored-xss-in-prospero-flow-c…
4daa8cea-433a-44bd-9456-53b127fc289a