## https://sploitus.com/exploit?id=PACKETSTORM:214946
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Blesta <= 5.13.1 (confirm_url) Reflected Cross-Site Scripting Vulnerability
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[-] Software Link:
https://www.blesta.com
[-] Affected Versions:
All versions from 3.2.0 to 5.13.1.
[-] Vulnerability Description:
User input passed through the "confirm_url" GET parameter to the
/dialog/confirm and /client_dialog/confirm/ endpoints is not properly
sanitized before being used to generate HTML output; specifically,
before being used as action attribute of an HTML form. This can be
exploited by attackers to perform 2-clicks Reflected Cross-Site
Scripting (XSS) attacks.
[-] Proof of Concept:
An attacker may trick a victim Blesta user into clicking on links like these:
http://[blesta]/dialog/confirm/?confirm_url=javascript:alert('XSS')
http://[blesta]/client_dialog/confirm/?confirm_url=javascript:eval(atob('YWxlcnQoJ1hTUyBvbiAnK2RvY3VtZW50LmRvbWFpbik='))
When the victim user clicks on the malicious link and then they also
click on the "Yes" button, the form will be submitted, and the
attacker-controlled JavaScript code will be executed on the victim
user's browser.
[-] Solution:
Apply the vendor patch or upgrade to version 5.13.2 or later.
[-] Disclosure Timeline:
[19/01/2026] - Vendor notified
[22/01/2026] - CVE identifier requested
[28/01/2026] - Version 5.13.2 released
[31/01/2026] - Version 5.13.3 released to address regressions
introduced in 5.13.2
[03/02/2026] - CVE identifier assigned
[04/02/2026] - Public disclosure
[-] CVE Reference:
The Common Vulnerabilities and Exposures project (cve.org) has
assigned the name CVE-2026-25616 to this vulnerability.
[-] Credits:
Vulnerability discovered by Egidio Romano.
[-] Other References:
https://www.blesta.com/2026/01/28/security-advisory/
[-] Original Advisory:
https://karmainsecurity.com/KIS-2026-01