Spreadsheet Formula Injection Vulnerability in Wger by Wger Project
CVE-2026-86257

4.8MEDIUM

Key Information:

Vendor

Wger-project

Status
Wger
Vendor
CVE Published:
6 September 2026

What is CVE-2026-86257?

Wger before version 2.6 is susceptible to a spreadsheet formula injection vulnerability that arises from the improper sanitization of the first_name and last_name fields in the gym member TSV export endpoint. This flaw permits any gym member to inject potentially malicious spreadsheet formulas, such as =HYPERLINK, into the exported data. If an admin opens an exported file in Excel or LibreOffice Calc, these injected formulas can execute unintended commands or exfiltrate sensitive administrative data.

Affected Version(s)

wger 0 < 2.6

wger 2.6

References

https://github.com/wger-project/wger/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/wger-before-2.6-csv-...
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

whatisproblem
.