CVE-2023-42343 Alkacon OpenCms is vulnerable to XSS via cmis-online/type
Attackers can inject malicious scripts into OpenCms via the cmis-online/type parameter, potentially compromising user sessions or executing code.
- 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
What is CVE-2023-42343?
CVE-2023-42343 is a medium-severity cross-site scripting vulnerability in n/a, published on 8 May 2026. 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
A Cross Site Scripting vulnerability in Alkacon OpenCms before 10.5.1 exists via cmis-online/type.
Weakness: CWE-79
Which versions are affected by CVE-2023-42343?
2 open source packages ship an affected version, including org.opencms:opencms-core.
| Package | Affected | Fixed in |
|---|---|---|
org.opencms:opencms-core Maven | All versions | 16.0 |
org.opencms:opencms-core Maven | All versions | 16.0 |
How do I fix CVE-2023-42343?
Upgrade org.opencms:opencms-core to 16.0 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2023-42343 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-42343 exists.
Public exploit code: 1 Nuclei template.
Sources
Also known as GHSA-8gpv-c454-3hfc.