# CVE-2026-86257

## Summary

- **CVE ID:** CVE-2026-86257
- **Severity:** MEDIUM
- **CVSS Score:** 5.4 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N)
- **CWE:** CWE-1236
- **Published:** Sep 6, 2026
- **Last Modified:** Sep 8, 2026

## Description

wger before 2.6 fails to sanitize first_name and last_name fields in the gym member TSV export endpoint, allowing any gym member to inject spreadsheet formulas. Attackers can inject formulas like =HYPERLINK to exfiltrate admin data or execute code when admins open the exported file in Excel or LibreOffice Calc.

## Affected Products

- wger-project — wger (0)
- wger-project — wger (2.6)

## References

- [CNA](https://github.com/wger-project/wger/security/advisories/GHSA-xq9m-hmp9-fw87)
- [CNA](https://www.vulncheck.com/advisories/wger-before-2.6-csv-formula-injection-via-member-export)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 6.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._