What is CVE-2026-100564?

CVE-2026-100564 is a medium-severity vulnerability in Openclaw, classified under Improper Neutralization of Formula Elements in a CSV File. CVSS score: 5.4/10. Published 2026-09-26.

How severe is CVE-2026-100564?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Openclaw

CVE-2026-100564

OpenClaw versions before 2026.8.1 fail to neutralize spreadsheet formula characters in participant display names within attendance CSV exports. Attackers can inject formula-like cells that execute with spreadsheet user permissions when the export is opened in formula-enabled applications.

Published 2026-09-26 · last modified 2026-09-30.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (8.5th percentile), scored 2026-11-10.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.5% 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: 0.002 · change: 0.000

Affected products

Openclaw

Weakness classification (CWE)

CWE-1236 — Improper Neutralization of Formula Elements in a CSV File

References

GitHub Security Advisory (GHSA-39hf-qg99-f4qv) (vendor-advisory)
VulnCheck Advisory: OpenClaw before 2026.8.1 CSV Formula Injection via Attendance Export (third-party-advisory)

Frequently asked questions

What is CVE-2026-100564?: CVE-2026-100564 is a medium-severity vulnerability in Openclaw, classified under Improper Neutralization of Formula Elements in a CSV File. CVSS score: 5.4/10. Published 2026-09-26.
How severe is CVE-2026-100564?: Medium severity. CVSS v3 base score is 5.4 out of 10.