CVE-2026-7765
User Messages widget leaked issuer messages on shared dashboards
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.
INFO
Published Date :
June 8, 2026, 1:16 p.m.
Last Modified :
July 23, 2026, 7:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Checkmk to version 2.5.0p5 or later.
- Verify widget authorization settings.
- Review message access controls.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-7765.
| URL | Resource |
|---|---|
| https://checkmk.com/werk/19815 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-7765 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-7765
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-7765 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-7765 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: Checkmk de Checkmk, Description: Autorización incorrecta en el widget del panel de control de Mensajes de Usuario en Checkmk <2.5.0p5 provoca que los puntos finales de recuperación de mensajes devuelvan los mensajes del creador del panel de control en lugar de los del espectador, permitiendo a un atacante que conoce un token de compartición de panel de control público válido leer los mensajes personales del emisor enviando solicitudes al punto final subyacente, incluso sin un widget de Mensajes de Usuario presente. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Checkmk GmbH', 'product': 'Checkmk', 'versions': [{'status': 'affected', 'version': '2.5.0', 'lessThan': '2.5.0p5', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-7765', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-08T13:04:52.177100Z'} -
Initial Analysis by [email protected]
Jun. 09, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Added CPE Configuration OR *cpe:2.3:a:checkmk:checkmk:2.5.0:b1:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.5.0:b2:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.5.0:b3:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.5.0:-:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.5.0:p1:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.5.0:p2:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.5.0:p3:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.5.0:p4:*:*:*:*:*:* Added Reference Type Checkmk GmbH: https://checkmk.com/werk/19815 Types: Vendor Advisory -
New CVE Received by [email protected]
Jun. 08, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-863 Added Reference https://checkmk.com/werk/19815