CVE-2026-86257

Medium

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.

SeverityMedium

CVSS5.4

Exploit probability—

ProductWger

PublishedSep 6, 2026

First seenSep 6, 2026

Weakness typeCWE-1236CWE-1236

How to fix

Update

wger2.6 or later

Vendor advisories

github.com/wger-project/wger/security/advisories/GHSA-xq9m-hmp9-fw87

Affected products

Product	Affected versions	Fixed in
wgerPyPI	v < 2.6	2.6

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