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TI-2026-06840 Aliases CVE-2026-7765GHSA-2x95-frx4-wh7r

User Messages widget leaked issuer messages on shared dashboards

Priority LOW 33CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00187 8th percentileScored 2026-11-07
Fix Fixed Checkmk (Checkmk GmbH): 2.5.0p5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Checkmk GmbHCheckmk2.5.0 to before 2.5.0p52.5.0p5Patch availableCNA
  • Checkmk VendorCheckmk GmbH Affected 2.5.0 to before 2.5.0p5 Fixed in 2.5.0p5 Patch available CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:a:checkmk:checkmk:2.5.0:-:*:*:*:*:*:*2.5.0VulnerableCheckmk GmbH
cpe:2.3:a:checkmk:checkmk:2.5.0:b1:*:*:*:*:*:*2.5.0 b1VulnerableCheckmk GmbH
cpe:2.3:a:checkmk:checkmk:2.5.0:b2:*:*:*:*:*:*2.5.0 b2VulnerableCheckmk GmbH
cpe:2.3:a:checkmk:checkmk:2.5.0:b3:*:*:*:*:*:*2.5.0 b3VulnerableCheckmk GmbH
cpe:2.3:a:checkmk:checkmk:2.5.0:p1:*:*:*:*:*:*2.5.0 p1VulnerableCheckmk GmbH
cpe:2.3:a:checkmk:checkmk:2.5.0:p2:*:*:*:*:*:*2.5.0 p2VulnerableCheckmk GmbH
cpe:2.3:a:checkmk:checkmk:2.5.0:p3:*:*:*:*:*:*2.5.0 p3VulnerableCheckmk GmbH
cpe:2.3:a:checkmk:checkmk:2.5.0:p4:*:*:*:*:*:*2.5.0 p4VulnerableCheckmk GmbH
  • cpe:2.3:a:checkmk:checkmk:2.5.0:-:*:*:*:*:*:* Versions 2.5.0 Vulnerable ·Checkmk GmbH
  • cpe:2.3:a:checkmk:checkmk:2.5.0:b1:*:*:*:*:*:* Versions 2.5.0 b1 Vulnerable ·Checkmk GmbH
  • cpe:2.3:a:checkmk:checkmk:2.5.0:b2:*:*:*:*:*:* Versions 2.5.0 b2 Vulnerable ·Checkmk GmbH
  • cpe:2.3:a:checkmk:checkmk:2.5.0:b3:*:*:*:*:*:* Versions 2.5.0 b3 Vulnerable ·Checkmk GmbH
  • cpe:2.3:a:checkmk:checkmk:2.5.0:p1:*:*:*:*:*:* Versions 2.5.0 p1 Vulnerable ·Checkmk GmbH
  • cpe:2.3:a:checkmk:checkmk:2.5.0:p2:*:*:*:*:*:* Versions 2.5.0 p2 Vulnerable ·Checkmk GmbH
  • cpe:2.3:a:checkmk:checkmk:2.5.0:p3:*:*:*:*:*:* Versions 2.5.0 p3 Vulnerable ·Checkmk GmbH
  • cpe:2.3:a:checkmk:checkmk:2.5.0:p4:*:*:*:*:*:* Versions 2.5.0 p4 Vulnerable ·Checkmk GmbH

Remediation

  • Fix · CNA Checkmk (Checkmk GmbH) Fixed in 2.5.0p5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-7765
  2. 2026-10-03 Alias added: GHSA-2x95-frx4-wh7r

References

Advisory 1

  • TI-2025-26345 Cross Site Scripting through compromised remote site CVSS 4.0HIGH 8.5
  • TI-2025-40190 Cross-site scripting in HTML logs of Synthetic Monitoring test services CVSS 4.0HIGH 7.3
  • TI-2024-19037 Brute-force protection ineffective for some login methods CVSS 3.1CRITICAL 9.8
  • TI-2024-05712 local IP restriction of internal HTTP endpoints CVSS 3.1CRITICAL 9.8
  • TI-2021-17818 The web management console of CheckMK Enterprise Edition (versions 1.5.0 to 2.0.0p9) does… CVSS 3.1HIGH 8.8
  • TI-2021-17817 The web management console of CheckMK Raw Edition (versions 1.5.0 to 1.6.0) allows a… CVSS 3.1HIGH 8.8
See all 107 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences