What is CVE-2026-86257?

CVE-2026-86257 is a medium-severity vulnerability in Wger-Project Wger, classified under Improper Neutralization of Formula Elements in a CSV File. CVSS score: 5.4/10. Published 2026-09-06.

How severe is CVE-2026-86257?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Wger-Project Wger

CVE-2026-86257

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.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Wger-project Wger

Weakness classification (CWE)

CWE-1236 — Improper Neutralization of Formula Elements in a CSV File

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-86257?: CVE-2026-86257 is a medium-severity vulnerability in Wger-Project Wger, classified under Improper Neutralization of Formula Elements in a CSV File. CVSS score: 5.4/10. Published 2026-09-06.
How severe is CVE-2026-86257?: Medium severity. CVSS v3 base score is 5.4 out of 10.