CVE-2026-7765 User Messages widget leaked issuer messages on shared dashboards
An attacker with a valid public dashboard share token can read the dashboard creator's personal messages due to incorrect authorization in the User Messages widget.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-7765?
CVE-2026-7765 is a medium-severity missing authorization vulnerability in Checkmk Checkmk, published on 8 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Incorrect authorization in the User Messages dashboard widget in Checkmk <2.5.0p5 causes the message-fetching endpoints to return the dashboard creator's messages rather than the viewer's, allowing an attacker who knows a valid public dashboard share token to read the issuer's personal messages by sending requests to the underlying endpoint, even without a User Messages widget present.
Weakness: CWE-863
Which versions are affected by CVE-2026-7765?
It affects 1 product.
Products include Checkmk Checkmk.
How do I fix CVE-2026-7765?
No fix has been published for CVE-2026-7765 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-7765 being exploited?
There is no known exploitation of CVE-2026-7765 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-2x95-frx4-wh7r, UBUNTU-CVE-2026-7765.