CVE-2026-3270 in PSI Probe
Summary
by MITRE • 02/27/2026
A vulnerability has been found in psi-probe PSI Probe up to 5.3.0. This affects the function lookup of the file psi-probe-core/src/main/java/psiprobe/tools/Whois.java of the component Whois. The manipulation leads to server-side request forgery. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 03/03/2026
The vulnerability identified as CVE-2026-3270 represents a critical server-side request forgery issue within PSI Probe version 5.3.0 and earlier, specifically affecting the Whois functionality located in the psi-probe-core module. This flaw resides in the file psi-probe/tools/Whois.java and demonstrates a significant security weakness that enables remote attackers to manipulate the application's behavior through crafted requests. The vulnerability stems from insufficient input validation and sanitization within the lookup function, creating an avenue for malicious actors to redirect requests to arbitrary destinations.
The technical implementation of this vulnerability involves the improper handling of user-supplied input within the Whois lookup mechanism, which allows attackers to inject malicious URLs or hostnames that bypass normal validation checks. This flaw operates under CWE-918, which classifies server-side request forgery vulnerabilities as a critical concern in web applications. The vulnerability's exploitation potential is amplified by its remote attack surface, meaning that an attacker can initiate the malicious request without requiring physical access to the target system. The disclosure of this exploit has created a significant risk landscape for organizations utilizing affected PSI Probe versions, as the attack vector can be leveraged to perform unauthorized network requests.
The operational impact of this vulnerability extends beyond simple data exfiltration, potentially enabling attackers to access internal systems that would otherwise be protected by network segmentation. Attackers can leverage this flaw to perform reconnaissance activities against internal networks, access sensitive data from internal services, or even establish command and control channels. This vulnerability aligns with ATT&CK technique T1071.004, which covers application layer protocol: DNS, as the Whois lookup functionality often involves DNS resolution that can be manipulated to redirect traffic. The lack of vendor response to early disclosure attempts compounds the risk, leaving organizations without official patches or mitigation guidance during the period when the vulnerability is publicly known.
Organizations deploying PSI Probe systems should immediately implement network-level mitigations including firewall rules that restrict access to the Whois functionality and monitor for suspicious DNS requests originating from affected systems. The recommended remediation strategy involves upgrading to the latest version of PSI Probe where this vulnerability has been addressed, though the absence of vendor response suggests that organizations may need to consider alternative approaches such as implementing application firewalls or proxy solutions to protect against exploitation. Security teams should also conduct comprehensive network scanning to identify all instances of affected PSI Probe versions and establish monitoring procedures to detect potential exploitation attempts through unusual outbound network connections or DNS queries that may indicate an active attack.