Medium severity · published Sep 6, 2026
CVE-2026-86257
wger before 2.6 CSV Formula Injection via member export
5.4
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WG
wger · wger-project
before 2.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86257
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86257
github.com
https://github.com/wger-project/wger/security/advisories/GHSA-xq9m-hmp9-fw87
www.vulncheck.com
https://www.vulncheck.com/advisories/wger-before-2.6-csv-formula-injection-via-member-export
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