# CVE-2024-56366: PhpSpreadsheet vulnerable to unauthorized reflected XSS in the Accounting.php file > Attackers can execute arbitrary scripts in user browsers via reflected XSS in the Accounting sample script of the PhpSpreadsheet library. - **Severity:** High 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`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 3 Jan 2025 - **Updated:** 3 Jan 2025 - **Also known as:** GHSA-c6fv-7vh8-2rhr ## What is CVE-2024-56366? CVE-2024-56366 is a high-severity cross-site scripting vulnerability in PHPOffice PhpSpreadsheet, published on 3 Jan 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### Official description PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. Versions prior to 3.7.0, 2.3.5, 2.1.6, and 1.29.7 are vulnerable to unauthorized reflected cross-site scripting in the `Accounting.php` file. Using the `/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Accounting.php` script, an attacker can perform a cross-site scripting attack. Versions 3.7.0, 2.3.5, 2.1.6, and 1.29.7 contain a patch for the issue. Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation) ## Which versions are affected by CVE-2024-56366? 10 open source packages ship an affected version, including phpoffice/phpspreadsheet and phpoffice/phpexcel. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `phpoffice/phpspreadsheet` | Packagist | All versions | 1.29.7 | | `phpoffice/phpspreadsheet` | Packagist | All versions | 1.29.7 | | `phpoffice/phpspreadsheet` | Packagist | From 2.0.0 | 2.1.6 | | `phpoffice/phpspreadsheet` | Packagist | From 2.0.0 | 2.1.6 | | `phpoffice/phpspreadsheet` | Packagist | From 2.2.0 | 2.3.5 | | `phpoffice/phpspreadsheet` | Packagist | From 2.2.0 | 2.3.5 | | `phpoffice/phpspreadsheet` | Packagist | From 3.0.0 | 3.7.0 | | `phpoffice/phpspreadsheet` | Packagist | From 3.0.0 | 3.7.0 | | `phpoffice/phpexcel` | Packagist | All versions to 1.8.2 | None | | `phpoffice/phpexcel` | Packagist | All versions to 1.8.2 | None | Products: Phpoffice Phpspreadsheet. ## How do I fix CVE-2024-56366? Upgrade phpoffice/phpspreadsheet to a fixed version for your release line: 1.29.7, 2.1.6, 2.3.5 or 3.7.0. ## Is CVE-2024-56366 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-56366 exists. ## Other vulnerabilities in PHPOffice PhpSpreadsheet - [CVE-2026-34084](https://insights.sbomify.com/CVE-2026-34084/): PhpSpreadsheet SSRF and RCE via PHP stream wrappers in IOFactory::load (critical 9.2) - [CVE-2024-45048](https://insights.sbomify.com/CVE-2024-45048/): XML External Entity Reference (XXE) in PHPSpreadsheet (high 8.8) - [CVE-2019-12331](https://insights.sbomify.com/CVE-2019-12331/): XXE in PHPSpreadsheet due to incomplete fix for previous encoding issue (high 8.8) - [CVE-2018-19277](https://insights.sbomify.com/CVE-2018-19277/): XXE in PHPSpreadsheet due to encoding issue (high 8.8) - [CVE-2024-56365](https://insights.sbomify.com/CVE-2024-56365/): PhpSpreadsheet vulnerable to unauthorized reflected XSS in the constructor of the Downloader class (high 8.3) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2024-56366 and fix it if it is affected. What it is: CVE-2024-56366 is a high-severity cross-site scripting vulnerability in PHPOffice PhpSpreadsheet, published on 3 Jan 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-56366 exists. Affected packages and fixed versions: - phpoffice/phpspreadsheet (Packagist): affected all versions; fixed in 1.29.7 - phpoffice/phpspreadsheet (Packagist): affected all versions; fixed in 1.29.7 - phpoffice/phpspreadsheet (Packagist): affected from 2.0.0; fixed in 2.1.6 - phpoffice/phpspreadsheet (Packagist): affected from 2.0.0; fixed in 2.1.6 - phpoffice/phpspreadsheet (Packagist): affected from 2.2.0; fixed in 2.3.5 - phpoffice/phpspreadsheet (Packagist): affected from 2.2.0; fixed in 2.3.5 - phpoffice/phpspreadsheet (Packagist): affected from 3.0.0; fixed in 3.7.0 - phpoffice/phpspreadsheet (Packagist): affected from 3.0.0; fixed in 3.7.0 - phpoffice/phpexcel (Packagist): affected all versions up to 1.8.2; no fix listed - phpoffice/phpexcel (Packagist): affected all versions up to 1.8.2; no fix listed Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2024-56366/ (Markdown: https://insights.sbomify.com/CVE-2024-56366/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2024-56366 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-56366 - OSV: https://osv.dev/vulnerability/CVE-2024-56366 --- From sbomify Insights: https://insights.sbomify.com/CVE-2024-56366/ Summaries are generated and may contain mistakes; the official description above is the record.