CVE-2026-3270Public exploitNetwork attack vector

Authenticated SSRF via unvalidated Whois referrals

Published Feb 26, 2026 · Updated Feb 26, 2026

SSRF in PSI Probe 5.3.0 and earlier allows remote authenticated users to reach internal services through crafted Whois queries. The Whois lookup() method follows an attacker-controlled ReferralServer value by opening a TCP connection to its host and port without validating the destination. A valid session and control of a Whois response are required, exposing an internal-service reachability oracle and server-originated connections.

CVSS severity8.8
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in PSI Probe 5.3.0 and earlier allows remote authenticated users to reach internal services through crafted Whois queries. The Whois lookup() method follows an attacker-controlled ReferralServer value by opening a TCP connection to its host and port without validating the destination. A valid session and control of a Whois response are required, exposing an internal-service reachability oracle and server-originated connections.

The record

CVE
CVE-2026-3270
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
PSI Probe
Product
PSI Probe
Classifications
CWE-918, CAPEC-664, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0
  2. Affected versionversion=5.1
  3. Affected versionversion=5.2
  4. Affected versionversion=5.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

PSI Probe · PSI Probeversion=5.0; version=5.1; version=5.2; version=5.3.0

Published CVSS scores

6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1046Network Service Scanning

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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