CVE-2026-59239
Stored XSS in Prospero Flow CRM email body allows administrator account takeover
Description
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.
INFO
Published Date :
July 27, 2026, 6:16 p.m.
Last Modified :
July 27, 2026, 7:17 p.m.
Remotely Exploit :
Yes !
Source :
4daa8cea-433a-44bd-9456-53b127fc289a
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | HIGH | 4daa8cea-433a-44bd-9456-53b127fc289a | ||||
| CVSS 4.0 | HIGH | 4daa8cea-433a-44bd-9456-53b127fc289a |
Solution
- Update Roskus Prospero Flow CRM to version 5.4.4 or later.
- Implement robust input sanitization for email bodies.
- Ensure proper output encoding when rendering email content.
- Review and restrict user privileges where possible.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-59239.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-59239 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-59239
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-59239 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-59239 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 27, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-59239', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-27T18:30:57.587132Z'} -
New CVE Received by 4daa8cea-433a-44bd-9456-53b127fc289a
Jul. 27, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/Roskus/prospero-flow-crm', 'vendor': 'Roskus', 'modules': ['Email module'], 'product': 'Prospero Flow CRM', 'versions': [{'status': 'affected', 'version': '1.0.0', 'lessThan': '5.4.4', 'versionType': 'semver'}], 'programFiles': ['app/Services/EmailCreateService.php', 'resources/views/email/view.blade.php', 'app/Http/Controllers/Profile/ProfileSaveController.php'], 'defaultStatus': 'unaffected', 'programRoutines': [{'name': 'EmailCreateService'}]}] Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-79 Added Reference https://github.com/Roskus/prospero-flow-crm/commit/32efcd5c395ee55119fb9aea502a9d06e4c5adb8 Added Reference https://github.com/Roskus/prospero-flow-crm/releases Added Reference https://secur0.com/en/cna/cve-list/cve-2026-59239-stored-xss-in-prospero-flow-crm-email-body-allows-administrator-account-takeover