CVE-2026-108357 (GCVE-0-2026-108357)
Vulnerability from cvelistv5 – Published: 2026-10-22 17:38 – Updated: 2026-10-23 21:08
VLAI
EPSS
VEX
Title
PhpSpreadsheet: XmlScanner Bypass via Double-Encoded unentity() TOCTOU Allows XXE and Denial of Service
Summary
PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. From 3.3.0 until 3.10.8 and 5.10.0, Reader\Xml passes stored SpreadsheetML XML through XmlScanner::scan in Xml::canRead and Xml::trySimpleXMLLoadStringPrivate, while Xml::unentity decodes numeric entities only after each DOCTYPE pattern check. A double-encoded less-than character is reduced by the first callback to another encoded character and by the second callback to a literal less-than sign, so SimpleXML receives an unchecked DOCTYPE and entity declaration. Processing attacker-controlled SpreadsheetML XML can cause entity-expansion denial of service 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 3.10.8 and 5.10.0.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-23 17:32 UTC
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/PHPOffice/PhpSpreadsheet/secur… | x_refsource_CONFIRM |
| https://github.com/PHPOffice/PhpSpreadsheet/commi… | x_refsource_MISC |
| https://github.com/PHPOffice/PhpSpreadsheet/commi… | x_refsource_MISC |
| https://github.com/PHPOffice/PhpSpreadsheet/relea… | x_refsource_MISC |
| https://github.com/PHPOffice/PhpSpreadsheet/relea… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| PHPOffice | PhpSpreadsheet |
Affected:
>= 3.3.0, < 3.10.8
Affected: >= 4.0.0, < 5.10.0 |
guessed |
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Sightings
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Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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