EUVD-2026-72112
GHSA-rc6j-63fm-mhq4
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Trainer authentication required (PR:L) and trainer must click the crafted link (UI:R); impact is limited to Referer-based user_pk leakage (C:L) and phishing redirect (I:L) with no availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Open redirect in wger's trainer_login view allows an attacker to redirect an authenticated trainer's browser to an arbitrary external domain immediately after impersonation mode is established. The root cause is in wger/core/views/user.py (~line 203), where HttpResponseRedirect(request.GET['next']) is called without invoking Django's url_has_allowed_host_and_scheme() guard, allowing any URL - including off-host ones - to be supplied via the ?next= GET parameter. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must hold an active, authenticated wger session with the `gym.gym_trainer` permission - anonymous or regular non-trainer users cannot reach the impersonation code path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:P, score 5.1) accurately characterises the attack profile: network-reachable with low complexity, but gated behind an authenticated trainer session and a social-engineering step requiring the trainer to interact with a crafted link. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to wger 2.6 or later, which fixes the vulnerability by adding a `url_has_allowed_host_and_scheme()` check in `wger/core/views/user.py` before issuing the redirect, falling back to `reverse('core:index')` for any URL that fails validation. … Detailed patch versions, workarounds, and compensating controls in full report. |
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