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

Quick assessment

Affected
wger-project wger
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

wger 2.6 之前的版本（受影响的版本 ≤ 2.5.0）在 视图（ ）中存在一个开放重定向漏洞。当训练员进入“模拟登录”（impersonation）模式后，该视图会直接通过 将请求重定向到用户通过 GET 参数 提供的值，而在使用 进行校验之前就直接执行了跳转。攻击者可以向已认证的训练员发送一个精心构造的链接，使其浏览器被重定向到攻击者控制的域名，从而实施钓鱼攻击，并可能通过 Referer 请求头泄露 wger 的 URL 结构（包括被模拟用户的 ）。

CVSS 5.4 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
wger-project wger < 2.6 affected
2.6 unaffected
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I. Basic Information for CVE-2026-86256

Vulnerability Information
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Vulnerability Title
wger before 2.6 Open Redirect via trainer-login next parameter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wger-project wger 0 ~ 2.6 -

II. Public POCs for CVE-2026-86256

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III. Intelligence Information for CVE-2026-86256

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Vendor Advisories for CVE-2026-86256 (2)

Same Patch Batch · wger-project · 2026-09-06 · 4 CVEs total

CVE-2026-86254 6.8 MEDIUM wger Incomplete Authorization Fix Cross-Tenant Account Deletion
CVE-2026-86255 6.5 MEDIUM wger before 2.5 Uncontrolled Resource Consumption via date_sequence
CVE-2026-86257 5.4 MEDIUM wger before 2.6 CSV Formula Injection via member export

IV. Related Vulnerabilities

Same product: wger
Same vendor: wger-project
Same weakness: CWE-601

V. Comments for CVE-2026-86256

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