CVE-2026-86257

4.8 mediumEPSS 0.3%

Medium (4.8). EPSS 0.3% chance of exploitation in the next 30 days. Fixed in wger 2.6.

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.

Severity

CVSS 4.0

4.8 medium

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

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-31)
CWE: CWE-1236
Published: 2026-09-06
Modified: 2026-09-08
Record from: the NVD, synced 2026-10-19

Packages (OSV)

Advisory	Ecosystem	Package	Affected	Fixed in
GHSA-xq9m-hmp9-fw87	PyPI	wger	<2.6	2.6

References

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

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