CVE-2026-108360

Vulnerability 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, Worksheet\Drawing::setPath validates only the initial external-image URL with setIsWhitelisted when setAllowExternalImages is enabled. The HTTP stream context permits PHP to follow a redirect without applying the callback to the redirected URL, so a permitted image host can redirect the server to an internal address and cause a blind GET request. The response body is not returned to the attacker because the reader validates the downloaded content as an image and removes the temporary file, but internal GET-driven endpoints, network reachability, and cloud metadata endpoints may be reached. This issue is fixed in versions 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0.

CVSS Score

Related Weaknesses (CWE)

References

• https://github.com/PHPOffice/PhpSpreadsheet/commit/299993894dce37aa3b64aa23e9a3f
• https://github.com/PHPOffice/PhpSpreadsheet/commit/94590951d76a250a5fc1ecf69a0b3
• https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1
• https://github.com/PHPOffice/PhpSpreadsheet/commit/9a0b48622ebfe93fa48cb9bc09ce5
• https://github.com/PHPOffice/PhpSpreadsheet/commit/da13f40e8760d599b0e8a296017d4
• https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.7
• https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.19
• https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.8
• 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/security/advisories/GHSA-2phh-27fw-q
• https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-2phh-27fw-q