CVE-2025-4296Network attack vector

User redirection via undisclosed validation flaw

Published Jul 23, 2025 · Updated Jun 5, 2026

Open redirect in HotelRunner B2B before 04.06.2025 allows remote attackers to send users to an untrusted site via a crafted link. The public CNA record does not identify the affected endpoint, input parameter, or validation error that permits the redirect. Exploitation requires a user to follow an attacker-supplied link, after which the service redirects the browser to an attacker-chosen destination.

CVSS severity4.7
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Open redirect in HotelRunner B2B before 04.06.2025 allows remote attackers to send users to an untrusted site via a crafted link. The public CNA record does not identify the affected endpoint, input parameter, or validation error that permits the redirect. Exploitation requires a user to follow an attacker-supplied link, after which the service redirects the browser to an attacker-chosen destination.

The record

CVE
CVE-2025-4296
Published
Jul 23, 2025
Updated
Jun 5, 2026
Vendor
HotelRunner
Product
HotelRunner B2B Network
Classifications
CWE-601, CAPEC-87
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <04.06.2025

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HotelRunner · HotelRunner B2B Networkversion=0 <04.06.2025

Published CVSS scores

4.7Computer Emergency Response Team of the Republic of TurkeyCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
CAPEC-87Forceful Browsing

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo