CVE-2026-86256 wger before 2.6 Open Redirect via trainer-login next parameter
An attacker can redirect authenticated trainers to malicious sites via a crafted link, enabling phishing and leaking user data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-86256?
CVE-2026-86256 is a medium-severity vulnerability in wger-project wger, published on 6 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-601
Which versions are affected by CVE-2026-86256?
2 open source packages ship an affected version, including wger.
| Package | Affected | Fixed in |
|---|---|---|
wger PyPI | All versions | 2.6 |
wger PyPI | All versions | 2.6 |
How do I fix CVE-2026-86256?
Upgrade wger to 2.6 or later.
Is CVE-2026-86256 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86256 exists.
Sources
Also known as GHSA-rc6j-63fm-mhq4, GHSA-vqv8-j3mj-wjxj.