# CVE-2026-86256

## Summary

- **CVE ID:** CVE-2026-86256
- **Severity:** MEDIUM
- **CVSS Score:** 5.4 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N)
- **CWE:** CWE-601
- **Published:** Sep 6, 2026
- **Last Modified:** Sep 9, 2026

## Description

wger before 2.6 (affected versions <= 2.5.0) contains an open redirect vulnerability in the trainer_login view (wger/core/views/user.py). After a trainer enters impersonation mode, the view redirects to the user-supplied 'next' GET parameter via HttpResponseRedirect() without validating it with url_has_allowed_host_and_scheme(). An attacker who delivers a crafted link to an authenticated trainer can redirect the trainer's browser to an attacker-controlled domain, enabling phishing and leaking the wger URL structure (including the impersonated user's user_pk) via the Referer header.

## Affected Products

- wger-project — wger (0)
- wger-project — wger (2.6)

## References

- [CNA](https://github.com/wger-project/wger/security/advisories/GHSA-vqv8-j3mj-wjxj)
- [CNA](https://www.vulncheck.com/advisories/wger-before-2.6-open-redirect-via-trainer-login-next-parameter)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.18%
- **EPSS Percentile:** 7.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._