CVE-2026-3103 Deletion of passwords via RestApi
A logic error allows low-privileged users to delete passwords via the API, causing data loss in Checkmk.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3103?
CVE-2026-3103 is a medium-severity vulnerability in Checkmk Checkmk, published on 4 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A logic error in the remove_password() function in Checkmk GmbH's Checkmk versions <2.4.0p23, <2.3.0p43, and 2.2.0 (EOL) allows a low-privileged user to cause data loss.
Weakness: CWE-863
Which versions are affected by CVE-2026-3103?
It affects 1 product.
Products include Checkmk Checkmk.
How do I fix CVE-2026-3103?
No fix has been published for CVE-2026-3103 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-3103 being exploited?
There is no known exploitation of CVE-2026-3103 in the wild and no public exploit code.
Other vulnerabilities in Checkmk Checkmk
- CVE-2025-39666 omd: Local privilege escalation when executing omd commands as root
- CVE-2024-8606 Fix 2FA bypass via RestAPI
- CVE-2022-46836 PHP code injection in watolib
- CVE-2025-32919 Privilege Escalation in Windows License plugin for Checkmk Windows Agent
- CVE-2024-28827 Privilege escalation in Windows agent
Sources
Also known as GHSA-g94r-mvhr-pc74, UBUNTU-CVE-2026-3103.