CVE-2026-86256 Details
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.
An open redirect vulnerability has been identified in wger versions prior to 2.6, specifically in the trainer_login view. The vulnerability arises because the view redirects users to the URL specified in the 'next' GET parameter without proper validation. This flaw allows an attacker to redirect an authenticated trainer to a malicious site, potentially leading to phishing attacks and unauthorized exposure of sensitive information, such as the wger URL structure and the impersonated user's user_pk, through the Referer header.
Users are advised to update to wger version 2.6 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 6, 2026CISA-ADP
Assessed Sep 9, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/wger-project/wger/security/advisories/GHSA-vqv8-j3mj-wjxj | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/wger-project/wger/security/advisories/GHSA-vqv8-j3mj-wjxj | [email protected] | AdvisoryExploitRemedyVendor |
| https://www.vulncheck.com/advisories/wger-before-2.6-open-redirect-via-trainer-login-next-parameter | [email protected] | Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-601 | URL Redirection to Untrusted Site ('Open Redirect') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| wger | <= 2.5.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 9, 2026 | CVE Modified | CISA-ADP |
| Sep 6, 2026 | New CVE Received | [email protected] |