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Medium, CVSS 6.4amended

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

CVE-2026-108360GHSA-2phh-27fw-q4gc

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (phpoffice/phpspreadsheet 5.10.0, 3.10.8, 2.4.8, 2.1.19, 1.30.7), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist phpoffice/phpspreadsheet

    Affected
    >= 4.0.0, < 5.10.0>= 3.3.0, < 3.10.8>= 2.2.0, < 2.4.8>= 2.0.0, < 2.1.19< 1.30.7
    Fixed in
    3.10.8, 2.4.8, 2.1.19, 1.30.7, 5.10.0

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
EPSS
  • CVE-2026-108360: 0.34% estimated exploitation activity in the next 30 days; percentile 27.38 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary PhpSpreadsheet's `Worksheet\Drawing::setPath()` validates an external-image URL against an operator-supplied `isWhitelisted` callback once, on the initial URL only, then fetches it with `file_get_contents()` using a stream context that does not set `follow_location => 0`. A whitelisted host that returns an HTTP `302 Location:` redirect to an internal target is therefore followed by PHP's HTTP wrapper (default `follow_location=1`, `max_redirects=20`) with no re-validation of the redirect hop — defeating the whitelist and yielding a blind SSRF from the server. This is an unfixed variant of CVE-2026-59931 (GHSA-6hq5-7373-42rg, the WEBSERVICE redirect-whitelist-bypass): the `follow_location => 0` fix (commit `7ef7b25e`) was applied ONLY to `Calculation/Web/Service.php`; `Worksheet/Drawing.php` was never touched.

Root Cause `src/PhpSpreadsheet/Worksheet/Drawing.php`: - Scheme allowlist at `:125` (`/^(http|https|file|ftp|s3):/`) permits `http`/`https` (the…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from osv record GHSA-2phh-27fw-q4gc

  2. Revision 1 · created ·

    Published from ghsa record GHSA-2phh-27fw-q4gc

Agent brief

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# Patch Next advisory brief: CVE-2026-108360

Advisory: PhpSpreadsheet: SSRF whitelist bypass via unre-validated HTTP redirect in Drawing::setPath external image loading
IDs: CVE-2026-108360, GHSA-2phh-27fw-q4gc
Record: https://patchnext.com/advisories/cve-2026-108360 (revision 2, source checked 28 Oct 2026, 06:30 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: phpoffice/phpspreadsheet 5.10.0, 3.10.8, 2.4.8, 2.1.19, 1.30.7. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist phpoffice/phpspreadsheet: affected >= 4.0.0, < 5.10.0; >= 3.3.0, < 3.10.8; >= 2.2.0, < 2.4.8; >= 2.0.0, < 2.1.19; < 1.30.7; fixed in 3.10.8, 2.4.8, 2.1.19, 1.30.7, 5.10.0

## Suggested inspection (read-only)
- Packagist phpoffice/phpspreadsheet: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on phpoffice/phpspreadsheet.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-2phh-27fw-q4gc (GitHub-reviewed advisory GHSA-2phh-27fw-q4gc lists affected ranges: Packagist phpoffice/phpspreadsheet >=4.0.0 =3.3.0 =2.2.0 =2.0.0 =0 <=1.30.6)
- Verified: https://osv.dev/vulnerability/GHSA-2phh-27fw-q4gc (OSV record GHSA-2phh-27fw-q4gc lists affected ranges: Packagist phpoffice/phpspreadsheet >=4.0.0 =3.3.0 =2.2.0 =2.0.0 =0 <1.30.7 (fixed))

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