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Vulnerability · Published Oct 22, 2026 · Assigned by GitHub_M

CVE-2026-108360PhpSpreadsheet: SSRF whitelist bypass via unre-validated HTTP redirect in Drawing::setPath external image loading

Medium 6.4

In plain English

A medium-severity incorrect authorization in PhpSpreadsheet from PHPOffice. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.3%top 72.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Packagistphpoffice/phpspreadsheet5.10.0GHSA-2phh-27fw-q4gc
Packagistphpoffice/phpspreadsheet3.10.8GHSA-2phh-27fw-q4gc
Packagistphpoffice/phpspreadsheet2.4.8GHSA-2phh-27fw-q4gc
Packagistphpoffice/phpspreadsheet2.1.19GHSA-2phh-27fw-q4gc
Packagistphpoffice/phpspreadsheet1.30.7GHSA-2phh-27fw-q4gc

Affected products (as reported)

VendorProductVersions
PHPOffice PhpSpreadsheet < 1.30.7>= 2.0.0, < 2.1.19>= 2.2.0, < 2.4.8>= 3.3.0, < 3.10.8>= 4.0.0, < 5.10.0

Weakness: CWE-863, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

References