# CVE-2023-42344: Alkacon OpenCms allows remote unauthenticated attackers to obtain sensitive information

> Remote unauthenticated attackers can obtain sensitive information via an XXE attack on the Chemistry servlet in Alkacon OpenCms.

- **Severity:** High 7.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 May 2026
- **Updated:** 8 May 2026
- **Also known as:** GHSA-rcc6-6q2f-m2cw

## What is CVE-2023-42344?

CVE-2023-42344 is a high-severity vulnerability in n/a, published on 8 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Alkacon OpenCms before 10.5.1 allows remote unauthenticated attackers to obtain sensitive information via a cmis-online/query XXE attack on a Chemistry servlet.

Weakness: CWE-611 (Improper Restriction of XML External Entity Reference)

## Which versions are affected by CVE-2023-42344?

2 open source packages ship an affected version, including org.opencms:opencms-core.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.opencms:opencms-core` | Maven | All versions | 10.5.1 |
| `org.opencms:opencms-core` | Maven | All versions | 10.5.1 |

## How do I fix CVE-2023-42344?

Upgrade org.opencms:opencms-core to 10.5.1 or later.

## Is CVE-2023-42344 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-42344 exists.

Public exploit code:

- OpenCMS - XML external entity (XXE) (nuclei): http/cves/2023/CVE-2023-42344.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-42344 and fix it if it is affected.

What it is: CVE-2023-42344 is a high-severity vulnerability in n/a, published on 8 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-42344 exists.

Affected packages and fixed versions:
- org.opencms:opencms-core (Maven): affected all versions; fixed in 10.5.1
- org.opencms:opencms-core (Maven): affected all versions; fixed in 10.5.1

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-2023-42344/ (Markdown: https://insights.sbomify.com/CVE-2023-42344/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-42344
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-42344
- OSV: https://osv.dev/vulnerability/CVE-2023-42344

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-42344/
Summaries are generated and may contain mistakes; the official description above is the record.