CVE-2026-108358

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files

Risk score: 74/100
CVSS: 8.8 v4.0
Exploit chance (30 days): 0.4%
Published: 22 Oct 2026

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What to know

What it is: PhpSpreadsheet has a vulnerability in its XmlScanner that can cause entity-expansion denial of service or permit local file access or SSRF. An attacker can exploit this by processing an attacker-controlled XLSX file.
Affected: {'products': ['PhpSpreadsheet'], 'packages': [], 'versions': ['prior to 1.30.7', 'prior to 2.1.19', 'prior to 2.4.8', 'prior to 3.10.8', 'prior to 5.10.0']}
Fix: Upgrade to versions 1.30.7, 2.1.19, 2.4.8, 3.10.8, or 5.10.0
Exploitation: No known exploitation

Why it is Amber

CVSS 8.8 high
Remotely exploitable without logging in
On your watchlist: php

References

Original description

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.

Last activity 22 Oct 2026. Patch Forecast updates every hour.