Vulnerability · Published Sep 6, 2026 · Assigned by VulnCheck

CVE-2026-86256wger before 2.6 Open Redirect via trainer-login next parameter

Medium 5.4

In plain English

A medium-severity open redirect in wger from wger-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 85.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	wger	2.6	GHSA-vqv8-j3mj-wjxj

Affected products (as reported)

Vendor	Product	Versions
wger-project	wger	0 – before 2.6

Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-vqv8-j3mj-wjxj) vendor-advisory
VulnCheck Advisory: wger before 2.6 Open Redirect via trainer-login next parameter third-party-advisory