# CVE-2013-4390: Apache Sling Auth Core bundle vulnerable to Open Redirection

> Remote attackers can redirect users to malicious sites via the resource parameter in Apache Sling's authentication form, facilitating phishing attacks.

- **Severity:** Medium 5.8 (`AV:N/AC:M/Au:N/C:P/I:P/A:N`)
- **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:** 24 Oct 2013
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-j7f2-cqvq-5jcf

## What is CVE-2013-4390?

CVE-2013-4390 is a medium-severity vulnerability in n/a, published on 24 Oct 2013. 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

Open redirect vulnerability in the AbstractAuthenticationFormServlet in the Auth Core (org.apache.sling.auth.core) bundle before 1.1.4 in Apache Sling allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a URL in the resource parameter, related to "a custom login form and XSS."

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2013-4390?

2 open source packages ship an affected version, including org.apache.sling:org.apache.sling.auth.core. It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.apache.sling:org.apache.sling.auth.core` | Maven | All versions | 1.1.4 |
| `org.apache.sling:org.apache.sling.auth.core` | Maven | All versions | 1.1.4 |

Products: Apache Sling, Apache Sling Auth Core Component.

## How do I fix CVE-2013-4390?

Upgrade org.apache.sling:org.apache.sling.auth.core to 1.1.4 or later.

## Is CVE-2013-4390 being exploited?

There is no known exploitation of CVE-2013-4390 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2016-6798](https://insights.sbomify.com/CVE-2016-6798/): XML External Entity Reference in Apache Sling (critical 9.8)
- [CVE-2016-5394](https://insights.sbomify.com/CVE-2016-5394/): Cross site scripting in Apache Sling (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2013-4390 and fix it if it is affected.

What it is: CVE-2013-4390 is a medium-severity vulnerability in n/a, published on 24 Oct 2013. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2013-4390 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.apache.sling:org.apache.sling.auth.core (Maven): affected all versions; fixed in 1.1.4
- org.apache.sling:org.apache.sling.auth.core (Maven): affected all versions; fixed in 1.1.4

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-2013-4390/ (Markdown: https://insights.sbomify.com/CVE-2013-4390/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-4390
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-4390
- OSV: https://osv.dev/vulnerability/CVE-2013-4390

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From sbomify Insights: https://insights.sbomify.com/CVE-2013-4390/
Summaries are generated and may contain mistakes; the official description above is the record.