# CVE-2026-43948: wger: cross-tenant password reset and plaintext disclosure via gym=None bypass

> Attackers with gym.manage_gym permission can bypass authorization checks to reset passwords and view plaintext credentials for users without gym assignments.

- **Severity:** Critical 9.9 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 12 May 2026
- **Updated:** 13 May 2026
- **Also known as:** GHSA-mhc8-p3jx-84mm, PYSEC-2026-574

## What is CVE-2026-43948?

CVE-2026-43948 is a critical authentication bypass vulnerability in wger-project wger, published on 12 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

wger is a free, open-source workout and fitness manager. Prior to 2.6, the reset_user_password and gym_permissions_user_edit views in wger perform a gym-scope authorization check using Python object comparison (!=) that evaluates None != None as False, silently bypassing the guard when both the attacker and victim have no gym assignment (gym=None). A user with gym.manage_gym permission and gym=None can reset the password of any other gym=None user; the new plaintext password is returned verbatim in the HTML response body, enabling one-shot full account takeover. The victim's original password is invalidated, locking them out permanently. This vulnerability is fixed in 2.6.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-43948?

3 open source packages ship an affected version, including wger.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `wger` | PyPI | All versions | 2.6 |
| `wger` | PyPI | All versions | 2.6 |
| `wger` | PyPI | All versions | 2.6 |

## How do I fix CVE-2026-43948?

Upgrade wger to 2.6 or later.

## Is CVE-2026-43948 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43948 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-43948 and fix it if it is affected.

What it is: CVE-2026-43948 is a critical authentication bypass vulnerability in wger-project wger, published on 12 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43948 exists.

Affected packages and fixed versions:
- wger (PyPI): affected all versions; fixed in 2.6
- wger (PyPI): affected all versions; fixed in 2.6
- wger (PyPI): affected all versions; fixed in 2.6

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-43948/ (Markdown: https://insights.sbomify.com/CVE-2026-43948/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-43948
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-43948
- OSV: https://osv.dev/vulnerability/CVE-2026-43948

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-43948/
Summaries are generated and may contain mistakes; the official description above is the record.