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CVE-2026-7765— User Messages widget leaked issuer messages on shared dashboards

Quick assessment

Affected
Checkmk GmbH Checkmk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Checkmk是Checkmk公司的一个 IT 监控平台。 Checkmk 2.5.0p5之前版本存在安全漏洞，该漏洞源于用户消息仪表板小部件中的授权不当，导致消息获取端点返回仪表板创建者的消息而非查看者的消息，允许知道有效公共仪表板共享令牌的攻击者通过向底层端点发送请求读取发布者的个人消息，即使没有用户消息小部件存在。

AI Predicted 6.5 Difficulty: Easy EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
Checkmk GmbH Checkmk 2.5.0< 2.5.0p5 affected
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I. Basic Information for CVE-2026-7765

Vulnerability Information
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Vulnerability Title
User Messages widget leaked issuer messages on shared dashboards
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Checkmk 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Checkmk是Checkmk公司的一个 IT 监控平台。 Checkmk 2.5.0p5之前版本存在安全漏洞，该漏洞源于用户消息仪表板小部件中的授权不当，导致消息获取端点返回仪表板创建者的消息而非查看者的消息，允许知道有效公共仪表板共享令牌的攻击者通过向底层端点发送请求读取发布者的个人消息，即使没有用户消息小部件存在。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Checkmk GmbH Checkmk 2.5.0 ~ 2.5.0p5 -

II. Public POCs for CVE-2026-7765

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III. Intelligence Information for CVE-2026-7765

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Vendor Advisories for CVE-2026-7765 (1)

Same Patch Batch · Checkmk GmbH · 2026-06-08 · 5 CVEs total

CVE-2026-7186 Fix stored XSS in URL dashboard widget via dangerous URI schemes
CVE-2026-9549 Fix XSS in service discovery active check output
CVE-2026-8833 XSS in urls
CVE-2026-8078 Fix stored XSS in global settings change log

IV. Related Vulnerabilities

Same product: Checkmk
Same vendor: Checkmk GmbH
Same weakness: CWE-863