Medium severity · published Sep 6, 2026
CVE-2026-86256
wger before 2.6 Open Redirect via trainer-login next parameter
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WG
wger · wger-project
before 2.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86256
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86256
github.com
https://github.com/wger-project/wger/security/advisories/GHSA-vqv8-j3mj-wjxj
www.vulncheck.com
https://www.vulncheck.com/advisories/wger-before-2.6-open-redirect-via-trainer-login-next-parameter
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