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High, CVSS 8.3

PhpSpreadsheet allows unauthorized Reflected XSS in Convert-Online.php file

CVE-2024-56408GHSA-x88g-h956-m5xg

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

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.

Add to your agent

Affected packages

  • Packagist phpoffice/phpexcel

    Affected
    <= 1.8.2
    Fixed in
    no fixed version recorded

  • Packagist phpoffice/phpspreadsheet

    Affected
    >= 3.0.0, < 3.7.0<= 1.29.6>= 2.0.0, <= 2.1.5>= 2.2.0, <= 2.3.4
    Fixed in
    2.3.5, 3.7.0, 1.29.7, 2.1.6

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:L/SI:H/SA:L · score source
EPSS
  • CVE-2024-56408: 0.41% estimated exploitation activity in the next 30 days; percentile 35.70 (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.

Unauthorized Reflected XSS in Convert-Online.php file Product: Phpspreadsheet Version: version 3.6.0 CWE-ID: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CVSS vector v.3.1: 8.2 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N) CVSS vector v.4.0: 8.3 (AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:L/SI:H/SA:L) Description: using the /vendor/phpoffice/phpspreadsheet/samples/Engineering/Convert-Online.php script, an attacker can perform a XSS-type attack Impact: executing arbitrary JavaScript code in the browser Vulnerable component: the /vendor/phpoffice/phpspreadsheet/samples/Engineering/Convert-Online.php file Exploitation conditions: an unauthorized user Mitigation: sanitization of the quantity variable Researcher: Aleksey Solovev (Positive Technologies) Research The researcher discovered zero-day vulnerability Unauthorized Reflected Cross-Site Scripting (XSS) (in Convert-Online.php file) in Phpspreadsheet. There is no sanitization in the…

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

    Published from ghsa record GHSA-x88g-h956-m5xg

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2024-56408

Advisory: PhpSpreadsheet allows unauthorized Reflected XSS in `Convert-Online.php` file
IDs: CVE-2024-56408, GHSA-x88g-h956-m5xg
Record: https://patchnext.com/advisories/cve-2024-56408 (revision 1, source checked 26 Oct 2026, 14:33 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: phpoffice/phpspreadsheet 3.7.0, 2.3.5, 2.1.6, 1.29.7. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist phpoffice/phpexcel: affected <= 1.8.2
- Packagist phpoffice/phpspreadsheet: affected >= 3.0.0, < 3.7.0; <= 1.29.6; >= 2.0.0, <= 2.1.5; >= 2.2.0, <= 2.3.4; fixed in 2.3.5, 3.7.0, 1.29.7, 2.1.6

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

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on phpoffice/phpexcel, 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-x88g-h956-m5xg (GitHub-reviewed advisory GHSA-x88g-h956-m5xg lists affected ranges: Packagist phpoffice/phpspreadsheet >=3.0.0 =0 =2.0.0 =2.2.0 =0 <=1.8.2)

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