# CVE-2024-29686: Winter CMS Server-Side Template Injection (SSTI) vulnerability

> Remote attackers with trusted user access can execute arbitrary code via Server-side Template Injection in Winter CMS pages and plugins.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Mar 2024
- **Updated:** 23 Aug 2024
- **Also known as:** GHSA-8r5j-gm3j-cx9c

## What is CVE-2024-29686?

CVE-2024-29686 is a high-severity code injection vulnerability in n/a, published on 29 Mar 2024. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Server-side Template Injection (SSTI) vulnerability in Winter CMS v.1.2.3 allows a remote attacker to execute arbitrary code via a crafted payload to the CMS Pages field and Plugin components. NOTE: the vendor disputes this because the payload could only be entered by a trusted user, such as the owner of the server that hosts Winter CMS, or a developer working for them.

Weakness: CWE-97 (Improper Neutralization of Server-Side Includes (SSI) Within a Web Page)

## Which versions are affected by CVE-2024-29686?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `wintercms/winter` | Packagist | All versions to 1.2.3 | None |
| `wintercms/winter` | Packagist | All versions to 1.2.3 | None |

Products: Wintercms Winter.

## How do I fix CVE-2024-29686?

No fix has been published for CVE-2024-29686 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-29686 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-29686 exists.

## Other vulnerabilities in n/a

- [CVE-2026-27591](https://insights.sbomify.com/CVE-2026-27591/): Winter: Privilege escalation by authenticated backend users (critical 10.0)
- [CVE-2024-54149](https://insights.sbomify.com/CVE-2024-54149/): Winter CMS Modules allows a sandbox bypass in Twig templates leading to data modification and deletion (high 8.5)
- [CVE-2022-39357](https://insights.sbomify.com/CVE-2022-39357/): Winter vulnerable to Prototype Pollution in Snowboard framework (high 8.1)
- [CVE-2023-52085](https://insights.sbomify.com/CVE-2023-52085/): Winter CMS Local File Inclusion through Server Side Template Injection (low 3.3)
- [CVE-2023-52083](https://insights.sbomify.com/CVE-2023-52083/): Stored XSS through privileged upload of Media Manager file followed by renaming (low 2.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-29686 and fix it if it is affected.

What it is: CVE-2024-29686 is a high-severity code injection vulnerability in n/a, published on 29 Mar 2024. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-29686 exists.

Affected packages and fixed versions:
- wintercms/winter (Packagist): affected all versions up to 1.2.3; no fix listed
- wintercms/winter (Packagist): affected all versions up to 1.2.3; 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-2024-29686/ (Markdown: https://insights.sbomify.com/CVE-2024-29686/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-29686
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-29686
- OSV: https://osv.dev/vulnerability/CVE-2024-29686

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-29686/
Summaries are generated and may contain mistakes; the official description above is the record.