# 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.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Jun 2026
- **Updated:** 8 Jun 2026
- **Also known as:** GHSA-2x95-frx4-wh7r, UBUNTU-CVE-2026-7765

## 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 (Incorrect Authorization)

## Which versions are affected by CVE-2026-7765?

It affects 1 product.


Products: 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.

## 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](https://insights.sbomify.com/CVE-2025-39666/): omd: Local privilege escalation when executing omd commands as root (critical 9.3)
- [CVE-2024-8606](https://insights.sbomify.com/CVE-2024-8606/): Fix 2FA bypass via RestAPI (critical 9.2)
- [CVE-2022-46836](https://insights.sbomify.com/CVE-2022-46836/): PHP code injection in watolib (critical 9.1)
- [CVE-2025-32919](https://insights.sbomify.com/CVE-2025-32919/): Privilege Escalation in Windows License plugin for Checkmk Windows Agent (high 8.8)
- [CVE-2024-28827](https://insights.sbomify.com/CVE-2024-28827/): Privilege escalation in Windows agent (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7765 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-7765 in the wild and no public exploit code.

Affected product: Checkmk Checkmk. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-7765/ (Markdown: https://insights.sbomify.com/CVE-2026-7765/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7765
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7765
- OSV: https://osv.dev/vulnerability/CVE-2026-7765

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7765/
Summaries are generated and may contain mistakes; the official description above is the record.