# CVE-2025-4294: HotelRunner B2B Cross-Site Scripting

Source: https://junglewise.ai/threats/cve-2025-4294-hotelrunner-b2b-cross-site-scripting  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-07-22. Updated: 2026-06-05  
License: CC BY 4.0 with a link back

CVE-2025-4294 · Severity: medium · CVSS 4.8 · Published 2025-07-22

A security vulnerability exists in HotelRunner B2B, a platform used for business-to-business travel and hospitality management. An attacker could inject malicious scripts into the platform, which would then execute in the browser of other users. This could lead to unauthorized actions being performed on behalf of users or the theft of sensitive session information.

Technologies: [HotelRunner B2B](https://junglewise.ai/threats/technologies/b2b). Vendors: [HotelRunner](https://junglewise.ai/threats/vendors/hotelrunner).

## Quick answers

**Is CVE-2025-4294 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-4294 being exploited in the wild.

**How severe is CVE-2025-4294?** Medium severity, with a CVSS score of 4.8, published 22 July 2025.

**Which products and versions are affected?** HotelRunner B2B before 04.06.2025.

**Is there a fix for CVE-2025-4294?** A patch was published on 2025-06-04. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-4294 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2025-4294?** Check whether you run HotelRunner B2B at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Cross-Site Scripting (XSS) vulnerability exists in HotelRunner B2B versions prior to 04.06.2025. The flaw stems from improper neutralization of user-supplied input during web page generation (CWE-79). An attacker with high privileges (PR:H) can exploit this over the network by injecting malicious scripts that execute when a victim interacts with the affected page (UI:R). This allows for limited impact on confidentiality and integrity within a different security scope (S:C). The issue was addressed in the update released on June 4, 2025.

## Affected products

- HotelRunner B2B before 04.06.2025

## Timeline

- 2025-07-22: disclosed
- 2025-07-22: advisory
- 2025-06-04: patched

## References

- [https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-25-0169](https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-25-0169)
- [https://www.usom.gov.tr/bildirim/tr-25-0169](https://www.usom.gov.tr/bildirim/tr-25-0169)

## Related threats

- [HotelRunner B2B open redirect and forceful browsing](https://junglewise.ai/threats/cve-2025-4296-hotelrunner-b2b-open-redirect-and-forceful-browsing)
- [HotelRunner B2B HTTP response splitting via certificate validation failure](https://junglewise.ai/threats/cve-2025-4295-hotelrunner-b2b-http-response-splitting-via-certificate-validation)