# CVE-2011-4962: Silverstripe CMS Arbitrary Code Execution

> Remote attackers can execute arbitrary code via crafted cookies in SilverStripe comment submissions due to unsafe deserialization.

- **Severity:** Medium 6.8 (`AV:N/AC:M/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Sep 2012
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-gv6c-59h4-9pmg

## What is CVE-2011-4962?

CVE-2011-4962 is a medium-severity unsafe deserialization vulnerability in Silverstripe Silverstripe, published on 17 Sep 2012. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

code/sitefeatures/PageCommentInterface.php in SilverStripe 2.4.x before 2.4.6 might allow remote attackers to execute arbitrary code via a crafted cookie in a user comment submission, which is not properly handled when it is deserialized.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2011-4962?

2 open source packages ship an affected version, including silverstripe/cms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `silverstripe/cms` | Packagist | From 2.4.0 | 2.4.6 |
| `silverstripe/cms` | Packagist | From 2.4.0 | 2.4.6 |

Products: Silverstripe Silverstripe.

## How do I fix CVE-2011-4962?

Upgrade silverstripe/cms to 2.4.6 or later.

## Is CVE-2011-4962 being exploited?

There is no known exploitation of CVE-2011-4962 in the wild and no public exploit code.

## Other vulnerabilities in Silverstripe Silverstripe

- [CVE-2007-2321](https://insights.sbomify.com/CVE-2007-2321/): Other in n/a (critical 10.0)
- [CVE-2019-12204](https://insights.sbomify.com/CVE-2019-12204/): Missing warning can lead to unauthenticated admin access in SilverStripe (critical 9.8)
- [CVE-2019-5715](https://insights.sbomify.com/CVE-2019-5715/): Silverstripe Framework SQLi Vulnerability (critical 9.8)
- [CVE-2019-12437](https://insights.sbomify.com/CVE-2019-12437/): Silverstripe CSRF Protection Bypass via GraphQL (high 8.8)
- [CVE-2020-6164](https://insights.sbomify.com/CVE-2020-6164/): Silverstripe CMS information disclosure (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-4962 and fix it if it is affected.

What it is: CVE-2011-4962 is a medium-severity unsafe deserialization vulnerability in Silverstripe Silverstripe, published on 17 Sep 2012. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2011-4962 in the wild and no public exploit code.

Affected packages and fixed versions:
- silverstripe/cms (Packagist): affected from 2.4.0; fixed in 2.4.6
- silverstripe/cms (Packagist): affected from 2.4.0; fixed in 2.4.6

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-2011-4962/ (Markdown: https://insights.sbomify.com/CVE-2011-4962/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-4962
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-4962
- OSV: https://osv.dev/vulnerability/CVE-2011-4962

---
From sbomify Insights: https://insights.sbomify.com/CVE-2011-4962/
Summaries are generated and may contain mistakes; the official description above is the record.