High 8.8Published Oct 22, 2026

CVE-2026-108358PhpSpreadsheet: XmlScanner Bypass via ISO-2022 Escape Sequences Allows XXE and Denial of Service

Updated under an hour ago (Oct 27, 2026, 10:30 PM ET)

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It affects PHPOffice PhpSpreadsheet. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.48%, higher than 41% of scored CVEs.

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Every CVE for PHPOffice PhpSpreadsheet

Exploited in the last 30 days

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0, XmlScanner::scan in src/PhpSpreadsheet/Reader/Security/XmlScanner.php uses a DOCTYPE detection pattern that accounts for NUL-byte interleaving but not ISO-2022 escape sequences in XLSX XML parts. The escape sequences prevent the scanner from matching the declaration, and XML charset normalization then removes the escape bytes before parsing, exposing a valid DOCTYPE and entity definitions. Processing an attacker-controlled XLSX can therefore cause entity-expansion denial of service on supported PHP versions and can permit local file access or SSRF on PHP before 8.0 or when LIBXML_NOENT is enabled. This issue is fixed in versions 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0.

CVSS: 8.8 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:L/SI:N/SA:N
Weakness (CWE): CWE-611, CWE-776
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.48% (percentile 41)
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 23, 2026
First seen by InfoSec Signals: Oct 22, 2026

Affected products

Affected products

PHPOffice PhpSpreadsheet phpoffice:phpspreadsheet (from the name)	before 1.30.7; from 2.0.0, < 2.1.19; from 2.2.0, < 2.4.8; from 3.3.0, < 3.10.8; from 4.0.0, < 5.10.0	CNA record

References

References

https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-3x94-m842-937c	x-refsource-confirm
https://github.com/PHPOffice/PhpSpreadsheet/commit/299993894dce37aa3b64aa23e9a3f4bb77ab0e66	x-refsource-misc
https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781	x-refsource-misc
https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738	x-refsource-misc
https://github.com/PHPOffice/PhpSpreadsheet/commit/9a0b48622ebfe93fa48cb9bc09ce57303bb07af9	x-refsource-misc
https://github.com/PHPOffice/PhpSpreadsheet/commit/da13f40e8760d599b0e8a296017d4b028b20e86c	x-refsource-misc
https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.7	x-refsource-misc
https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.19	x-refsource-misc
https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.8	x-refsource-misc
https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8	x-refsource-misc
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.