Is phpoffice/phpspreadsheet affected by CVE-2026-35453?

Packagist phpoffice/phpspreadsheet is affected in >=4.0.0 =3.3.0 =2.2.0 =2.0.0 <2.1.16, <1.30.4.

Is CVE-2026-35453 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

medium

CVE-2026-35453

Q: Is CVE-2026-35453 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

Packagist · phpoffice/phpspreadsheet

Summary

PhpSpreadsheet has XSS via NumberFormat @ Text Substitution in HTML Writer

Severity: medium
EPSS: 0.2% (p10)
Also known as: GHSA-6wpp-88cp-7q68
Published: 2026-04-28

References

Related advisories

CVE-2026-45034 — critical · Packagist/phpoffice/phpspreadsheet
CVE-2026-34084 — critical · Packagist/phpoffice/phpspreadsheet
CVE-2026-40902 — high · Packagist/phpoffice/phpspreadsheet
CVE-2026-40863 — high · Packagist/phpoffice/phpspreadsheet
CVE-2025-54370 — high · Packagist/phpoffice/phpspreadsheet
CVE-2024-56409 — high · Packagist/phpoffice/phpspreadsheet
CVE-2024-56366 — high · Packagist/phpoffice/phpspreadsheet
CVE-2024-56365 — high · Packagist/phpoffice/phpspreadsheet

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.