# CVE-2019-9874: Sitecore CMS and Experience Platform (XP) Deserialization

> Unauthenticated attackers can execute arbitrary code in Sitecore CMS by sending a malicious serialized .NET object in the CSRF token parameter.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 26 Mar 2025 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 May 2019
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-wfwm-vf76-3692

## What is CVE-2019-9874?

CVE-2019-9874 is a critical unsafe deserialization vulnerability in n/a, published on 31 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Deserialization of Untrusted Data in the Sitecore.Security.AntiCSRF (aka anti CSRF) module in Sitecore CMS 7.0 to 7.2 and Sitecore XP 7.5 to 8.2 allows an unauthenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2019-9874?

It affects 2 products.


Products: Sitecore Cms, Sitecore Experience Platform.

## How do I fix CVE-2019-9874?

No fix has been published for CVE-2019-9874 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 16 Apr 2025.

## Is CVE-2019-9874 being exploited?

Yes. Attackers have exploited CVE-2019-9874 in the wild since at least 26 Mar 2025.

Public exploit code:

- Sitecore Experience Platform - Deserialization of Untrusted Data (nuclei): http/cves/2019/CVE-2019-9874.yaml

## Other vulnerabilities in n/a

- [CVE-2019-9875](https://insights.sbomify.com/CVE-2019-9875/): Sitecore CMS and Experience Platform (XP) Deserialization (high 8.8, exploited in the wild)
- [CVE-2019-11198](https://insights.sbomify.com/CVE-2019-11198/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2017-11439](https://insights.sbomify.com/CVE-2017-11439/): In Sitecore 8.2, there is reflected XSS in the shell/Applications/Tools/Run Program parameter. (medium 5.4)
- [CVE-2017-11440](https://insights.sbomify.com/CVE-2017-11440/): In Sitecore 8.2, there is absolute path traversal via the shell/Applications/Layouts/IDE.aspx fi parameter and the admin/LinqScratchPad.aspx Reference parameter. (medium 4.9)
- [CVE-2014-100004](https://insights.sbomify.com/CVE-2014-100004/): Cross-site scripting in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-9874 and fix it if it is affected.

What it is: CVE-2019-9874 is a critical unsafe deserialization vulnerability in n/a, published on 31 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2019-9874 in the wild since at least 26 Mar 2025.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2019-9874/ (Markdown: https://insights.sbomify.com/CVE-2019-9874/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-9874
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-9874
- OSV: https://osv.dev/vulnerability/CVE-2019-9874

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-9874/
Summaries are generated and may contain mistakes; the official description above is the record.