---
title: "CVE-2026-108357: PhpSpreadsheet - XML External Entity Injection"
description: "PhpSpreadsheet 3.3.0 to < 3.10.8 and 5.x < 5.10.0 contains an XML external entity injection caused by improper entity decoding in XmlScanner and Xml::unentity, letting attackers cause denial of service, local file access, or SSRF via crafted SpreadsheetML XML, exploit requires processing attacker-controlled XML."
url: https://panop.io/threat-heartbeat/CVE-2026-108357/
---

# CVE-2026-108357 PhpSpreadsheet - XML External Entity Injection

PhpSpreadsheet 3.3.0 to < 3.10.8 and 5.x < 5.10.0 contains an XML external entity injection caused by improper entity decoding in XmlScanner and Xml::unentity, letting attackers cause denial of service, local file access, or SSRF via crafted SpreadsheetML XML, exploit requires processing attacker-controlled XML.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-108357)

## Details

Type

XML External Entity Injection

Impact

Denial Of Service, File System Read, Server Side Request Forgery

CVSS vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-611](https://cwe.mitre.org/data/definitions/611.html)

## Vendor fix

Update to versions 3.10.8 or 5.10.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-108357](https://nvd.nist.gov/vuln/detail/CVE-2026-108357)
- [https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8](https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8)
- [https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0](https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0)
- [https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-rxj4-h86g-25gc](https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-rxj4-h86g-25gc)
- [https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781](https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781)
- [https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738](https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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