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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (19.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/wger-project/wger/security/advisories/GHSA-xq9m-hmp9-fw87 (vendor-advisory)
- www.vulncheck.com/advisories/wger-before-2.6-csv-formula-injection-via-member-e… (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.