CVE-2026-43978 json
wger: Privilege escalation via trainer-login session chaining allows gym trainers to impersonate gym managers
published 2026-05-14 5 mo ago modified 2026-11-06 3 d ago also EUVD-2026-45066 , GHSA-9qpr-vc49-hqg2 , PYSEC-2026-3420
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 18%
- public exploits
- 0
- none known
Summary
wger is a free, open-source workout and fitness manager. In versions prior to 2.6, a gym trainer can escalate their session to any higher-privileged account (gym manager, general manager) by chaining two calls to the trainer-login endpoint. Once a trainer performs a legitimate switch into a low-privileged user, the session flag trainer.identity is set and this flag alone bypasses the permission check on all subsequent trainer-login calls. This grants full gym administration capabilities including viewing all member data, modifying contracts, managing gym configuration, and accessing other trainers' and managers' personal information. This issue has been fixed in version 2.6.
Patch / fix
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 3 mo ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/wger-project/wger/security/advisories/GHSA-9qpr-vc49-hqg2 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| OSV | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | wger | <=2.5 |
no fix listed |
Affected products
- wger-project wger
Classification
- Weakness
-
- CWE-269 Improper Privilege Management
References
-
github.com
/wger-project/wger/commit/19c97822492f9914ccfcebeeda319be4e7562790
web
-
github.com
/wger-project/wger/security/advisories/GHSA-9qpr-vc49-hqg2
exploit, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-43978
advisory
-
github.com
/advisories/GHSA-9qpr-vc49-hqg2
advisory
-
github.com
/pypa/advisory-database/tree/main/vulns/wger/PYSEC-2026-3420.yaml
web
-
github.com
/wger-project/wger
package
-
pypi.org
/project/wger
web, package
Sources
- CVE List CVE-2026-43978
- GitHub Advisory GHSA-9qpr-vc49-hqg2
- NVD CVE-2026-43978
- OSV PYSEC-2026-3420
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.