CVE-2025-7702 Overview
CVE-2025-7702 is an open redirect vulnerability [CWE-601] affecting the Pusula Communication Information Internet Industry and Trade Ltd. Co. Manageable Email Sending System. The flaw exists in versions from <=2025.06 before 2025.08.06. Attackers can craft URLs that redirect users from a trusted application domain to attacker-controlled destinations. This behavior exploits the trust users place in the application, enabling phishing and credential harvesting campaigns. Successful exploitation requires user interaction, typically clicking a manipulated link.
Critical Impact
Attackers can abuse the trusted email sending domain to redirect recipients to malicious sites, facilitating credential theft and malware delivery through convincing phishing lures.
Affected Products
- Pusula Manageable Email Sending System versions <=2025.06
- Pusula Manageable Email Sending System versions before 2025.08.06
Discovery Timeline
- 2025-09-19 - CVE-2025-7702 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-7702
Vulnerability Analysis
The vulnerability resides in the redirect handling logic of the Manageable Email Sending System. The application accepts a user-controlled URL parameter and issues an HTTP redirect without validating the destination against an allowlist of trusted domains. Because the request originates from a legitimate application endpoint, security controls and users perceive the initial URL as trustworthy.
Attackers weaponize this trust by embedding crafted redirect links inside phishing emails, social media posts, or malicious advertisements. When a victim clicks the link, the vulnerable endpoint forwards the browser to an attacker-controlled site that mimics a legitimate login page or delivers malware.
The attack requires network access and user interaction. The scope is changed because the impact extends beyond the vulnerable component to affect user browsers and downstream systems. Confidentiality impact is limited to information disclosed through the redirect flow, such as referrer headers or session context.
Root Cause
The root cause is missing or insufficient validation of the redirect target parameter. The application trusts client-supplied input to determine the redirect destination, violating the principle of never trusting user input for security-sensitive decisions.
Attack Vector
An attacker constructs a URL pointing to a legitimate endpoint of the Manageable Email Sending System while appending a redirect parameter that references an external domain. The victim receives the link through phishing or other social engineering channels. Upon clicking, the application issues a 3xx redirect to the attacker-controlled destination. The vulnerability manifests entirely in the redirect handler logic. Consult the USOM Security Notification for additional technical detail.
Detection Methods for CVE-2025-7702
Indicators of Compromise
- Outbound HTTP 3xx responses from the Manageable Email Sending System pointing to external, non-corporate domains
- Web server access logs containing redirect parameters with fully qualified external URLs or encoded payloads
- Spike in click-through traffic from email campaigns referencing the application's domain followed by external redirects
Detection Strategies
- Inspect application access logs for redirect parameters carrying absolute URLs, protocol-relative URLs, or encoded schemes such as %2F%2Fattacker.example
- Correlate outbound proxy telemetry with user click activity to identify redirect chains that start on the trusted application domain
- Deploy web application firewall rules that flag redirect endpoints containing untrusted host values
Monitoring Recommendations
- Alert on unusual referrer patterns where phishing domains reference the application's redirect endpoint
- Monitor URL reputation feeds for lookalike domains paired with the application's redirect endpoint in known phishing kits
- Track user reports of suspicious emails that appear to originate from or link through the trusted domain
How to Mitigate CVE-2025-7702
Immediate Actions Required
- Upgrade the Manageable Email Sending System to version 2025.08.06 or later
- Audit outbound email templates and links to identify any URLs generated by the vulnerable version
- Notify recipients of previously sent campaigns to be cautious of unexpected redirects
Patch Information
The vendor addressed CVE-2025-7702 in Manageable Email Sending System version 2025.08.06. Details are published in the Siber Güvenlik Notification and mirrored in the USOM Security Notification. Administrators should apply the update immediately and confirm the version after deployment.
Workarounds
- Implement an allowlist of approved redirect destinations at the reverse proxy or web application firewall layer
- Strip or reject requests containing absolute URLs in redirect parameters until the patch is applied
- Display an interstitial warning page whenever a redirect leaves the trusted domain, giving users an opportunity to abort
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
