# CVE-2026-45161: wger trainer_login CSRF bypass via GET request

Source: https://junglewise.ai/threats/cve-2026-45161-wger-trainer-login-accepts-get-csrf-bypass-enables-forced-session  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-07. Updated: 2026-10-07  
License: CC BY 4.0 with a link back

CVE-2026-45161 · Severity: medium · CVSS 5.4 · Published 2026-10-07

wger is a fitness and gym management web application. The trainer_login feature accepts unsafe GET requests without CSRF protection, allowing an attacker to force an authenticated trainer's session to rebind to an arbitrary user account by embedding an image on a malicious page. When the trainer loads that page, their browser automatically makes the request with their session cookie, giving the attacker impersonation of any gym user.

Technologies: [wger (PyPI)](https://junglewise.ai/threats/technologies/wger), [Wger](https://junglewise.ai/threats/technologies/wger-wger). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi), [Wger](https://junglewise.ai/threats/vendors/wger).

## Quick answers

**Is CVE-2026-45161 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-45161 being exploited in the wild.

**How severe is CVE-2026-45161?** Medium severity, with a CVSS score of 5.4, published 7 October 2026.

**Which products and versions are affected?** wger (PyPI) <= 2.1, ECOSYSTEM:introduced=0,last_affected=2.1.

**Is there a fix for CVE-2026-45161?** No fixed version is recorded yet. Apply the suggested patch: add @require_POST decorator to the trainer_login view and move the ?next= parameter from GET to POST with proper URL validation using url_has_allowed_host_and_scheme to prevent open redirect attacks in combination with this CSRF vector.</anigation>
<parameter name="timeline">[{"kind": "disclosed", "at": "2026-10-07"}, {"kind": "advisory", "at": "2026-10-07"}] If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-45161 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-45161?** Check whether you run wger (PyPI) or Wger 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.

## How to fix


Apply the suggested patch: add @require_POST decorator to the trainer_login view and move the ?next= parameter from GET to POST with proper URL validation using url_has_allowed_host_and_scheme to prevent open redirect attacks in combination with this CSRF vector.</anigation>
<parameter name="timeline">[{"kind": "disclosed", "at": "2026-10-07"}, {"kind": "advisory", "at": "2026-10-07"}]

## Technical details

The trainer_login view in wger/core/views/user.py executes Django's login function on GET requests, bypassing CSRF middleware which only validates tokens on unsafe methods (POST/PUT/PATCH/DELETE). An attacker can exploit this via an image tag that triggers a same-origin session rebinding through the server's own ?next= redirect chain, circumventing SameSite=Lax restrictions. The fix requires adding @require_POST decorator and moving the next parameter to POST body with validation.

## Affected products

- wger wger

## Identifiers

- CVE-2026-45161
- GHSA-xf64-4pmc-h8qf
- PYSEC-2026-4317

## Related threats

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- [wger Trainer privilege escalation in user deactivation](https://junglewise.ai/threats/cve-2026-46434-wger-trainer-privilege-escalation-improper-privilege-management)
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- [wger CSV/TSV formula injection in gym member export](https://junglewise.ai/threats/cve-2026-86257-wger-csv-tsv-formula-injection-in-gym-member-export)