Vulnerability-Lookup

CVE-2026-7765 (GCVE-0-2026-7765)

Vulnerability from cvelistv5 – Published: 2026-06-08 12:06 – Updated: 2026-06-08 13:04

Title

User Messages widget leaked issuer messages on shared dashboards

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.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-863 - Incorrect Authorization

Assigner

Checkmk

References

1 reference

URL	Tags
https://checkmk.com/werk/19815	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Checkmk GmbH	Checkmk	Affected: 2.5.0 , < 2.5.0p5 (semver)

Show details on NVD website

JSON

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FKIE_CVE-2026-7765

Vulnerability from fkie_nvd - Published: 2026-06-08 13:16 - Updated: 2026-07-23 07:10

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Summary

References

	URL	Tags
	security@checkmk.com	https://checkmk.com/werk/19815	Vendor Advisory

Impacted products

Vendor	Product	Version
checkmk	checkmk	2.5.0
checkmk	checkmk	2.5.0
checkmk	checkmk	2.5.0
checkmk	checkmk	2.5.0
checkmk	checkmk	2.5.0
checkmk	checkmk	2.5.0
checkmk	checkmk	2.5.0
checkmk	checkmk	2.5.0

JSON

To clipboard

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        }
      ],
      "source": "security@checkmk.com",
      "type": "Secondary"
    }
  ]
}

GHSA-2X95-FRX4-WH7R

Vulnerability from github – Published: 2026-06-08 15:32 – Updated: 2026-06-09 15:32

Details

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

6.3 (Medium)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-7765"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-08T13:16:33Z",
    "severity": "MODERATE"
  },
  "details": "Incorrect authorization in the User Messages dashboard widget in Checkmk \u003c2.5.0p5 causes the message-fetching endpoints to return the dashboard creator\u0027s messages rather than the viewer\u0027s, allowing an attacker who knows a valid public dashboard share token to read the issuer\u0027s personal messages by sending requests to the underlying endpoint, even without a User Messages widget present.",
  "id": "GHSA-2x95-frx4-wh7r",
  "modified": "2026-06-09T15:32:07Z",
  "published": "2026-06-08T15:32:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-7765"
    },
    {
      "type": "WEB",
      "url": "https://checkmk.com/werk/19815"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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/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",
      "type": "CVSS_V4"
    }
  ]
}

ubuntu-cve-2026-7765

Vulnerability from osv_ubuntu

Published

2026-06-08 13:16

Modified

2026-06-11 13:02

Summary

Details

Severity

6.3 (Medium)


                    
                      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

5.3 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-7765	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-7765	REPORT
	https://checkmk.com/werk/19815	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "check-mk-agent",
            "binary_version": "1.2.6p12-1ubuntu0.16.04.1+esm1"
          },
          {
            "binary_name": "check-mk-agent-logwatch",
            "binary_version": "1.2.6p12-1ubuntu0.16.04.1+esm1"
          },
          {
            "binary_name": "check-mk-config-icinga",
            "binary_version": "1.2.6p12-1ubuntu0.16.04.1+esm1"
          },
          {
            "binary_name": "check-mk-config-nagios3",
            "binary_version": "1.2.6p12-1ubuntu0.16.04.1+esm1"
          },
          {
            "binary_name": "check-mk-livestatus",
            "binary_version": "1.2.6p12-1ubuntu0.16.04.1+esm1"
          },
          {
            "binary_name": "check-mk-multisite",
            "binary_version": "1.2.6p12-1ubuntu0.16.04.1+esm1"
          },
          {
            "binary_name": "check-mk-server",
            "binary_version": "1.2.6p12-1ubuntu0.16.04.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "check-mk",
        "purl": "pkg:deb/ubuntu/check-mk@1.2.6p12-1ubuntu0.16.04.1+esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.6p5-1",
        "1.2.6p12-1",
        "1.2.6p12-1ubuntu0.16.04.1",
        "1.2.6p12-1ubuntu0.16.04.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "check-mk-agent",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-agent-logwatch",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-config-icinga",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-livestatus",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-multisite",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          },
          {
            "binary_name": "check-mk-server",
            "binary_version": "1.2.8p16-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "check-mk",
        "purl": "pkg:deb/ubuntu/check-mk@1.2.8p16-1ubuntu0.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.8p16-1ubuntu0.1",
        "1.2.8p16-1ubuntu0.2"
      ]
    }
  ],
  "aliases": [],
  "details": "Incorrect authorization in the User Messages dashboard widget in Checkmk \u003c2.5.0p5 causes the message-fetching endpoints to return the dashboard creator\u0027s messages rather than the viewer\u0027s, allowing an attacker who knows a valid public dashboard share token to read the issuer\u0027s personal messages by sending requests to the underlying endpoint, even without a User Messages widget present.",
  "id": "UBUNTU-CVE-2026-7765",
  "modified": "2026-06-11T13:02:01Z",
  "published": "2026-06-08T13:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-7765"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-7765"
    },
    {
      "type": "REPORT",
      "url": "https://checkmk.com/werk/19815"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-7765"
  ]
}

WID-SEC-W-2026-1817

Vulnerability from csaf_certbund - Published: 2026-06-08 22:00 - Updated: 2026-06-08 22:00

Summary

Checkmk: Mehrere Schwachstellen ermöglichen Cross-Site Scripting

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: Checkmk ist eine IT-Monitoring-Software.

Angriff: Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Checkmk ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.

Betroffene Betriebssysteme: - Sonstiges - UNIX

CVE-2026-7186

Affected products

Known affected 3 products

Product	Identifier	Version	Remediation
Checkmk Checkmk <2.4.0p31 Checkmk / Checkmk		<2.4.0p31
Checkmk Checkmk <2.5.0p5 Checkmk / Checkmk		<2.5.0p5
Checkmk Checkmk <2.3.0p48 Checkmk / Checkmk		<2.3.0p48

CVE-2026-7765

Affected products

Known affected 3 products

Product	Identifier	Version	Remediation
Checkmk Checkmk <2.4.0p31 Checkmk / Checkmk		<2.4.0p31
Checkmk Checkmk <2.5.0p5 Checkmk / Checkmk		<2.5.0p5
Checkmk Checkmk <2.3.0p48 Checkmk / Checkmk		<2.3.0p48

CVE-2026-8078

Affected products

Known affected 3 products

Product	Identifier	Version	Remediation
Checkmk Checkmk <2.4.0p31 Checkmk / Checkmk		<2.4.0p31
Checkmk Checkmk <2.5.0p5 Checkmk / Checkmk		<2.5.0p5
Checkmk Checkmk <2.3.0p48 Checkmk / Checkmk		<2.3.0p48

CVE-2026-8833

Affected products

Known affected 3 products

Product	Identifier	Version	Remediation
Checkmk Checkmk <2.4.0p31 Checkmk / Checkmk		<2.4.0p31
Checkmk Checkmk <2.5.0p5 Checkmk / Checkmk		<2.5.0p5
Checkmk Checkmk <2.3.0p48 Checkmk / Checkmk		<2.3.0p48

CVE-2026-9549

Affected products

Known affected 3 products

Product	Identifier	Version	Remediation
Checkmk Checkmk <2.4.0p31 Checkmk / Checkmk		<2.4.0p31
Checkmk Checkmk <2.5.0p5 Checkmk / Checkmk		<2.5.0p5
Checkmk Checkmk <2.3.0p48 Checkmk / Checkmk		<2.3.0p48

References

7 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://checkmk.com/werk/17991	external
https://checkmk.com/werk/17992	external
https://checkmk.com/werk/17993	external
https://checkmk.com/werk/20002	external
https://checkmk.com/werk/19815	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Checkmk ist eine IT-Monitoring-Software.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Checkmk ausnutzen, um einen Cross-Site Scripting Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Sonstiges\n- UNIX",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1817 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1817.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1817 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1817"
      },
      {
        "category": "external",
        "summary": "CheckMK Werk 17991 vom 2026-06-08",
        "url": "https://checkmk.com/werk/17991"
      },
      {
        "category": "external",
        "summary": "CheckMK Werk 17992 vom 2026-06-08",
        "url": "https://checkmk.com/werk/17992"
      },
      {
        "category": "external",
        "summary": "CheckMK Werk 17993 vom 2026-06-08",
        "url": "https://checkmk.com/werk/17993"
      },
      {
        "category": "external",
        "summary": "CheckMK Werk 20002 vom 2026-06-08",
        "url": "https://checkmk.com/werk/20002"
      },
      {
        "category": "external",
        "summary": "CheckMK Werk 19815 vom 2026-06-08",
        "url": "https://checkmk.com/werk/19815"
      }
    ],
    "source_lang": "en-US",
    "title": "Checkmk: Mehrere Schwachstellen erm\u00f6glichen Cross-Site Scripting",
    "tracking": {
      "current_release_date": "2026-06-08T22:00:00.000+00:00",
      "generator": {
        "date": "2026-06-09T09:40:58.660+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-1817",
      "initial_release_date": "2026-06-08T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-06-08T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c2.5.0p5",
                "product": {
                  "name": "Checkmk Checkmk \u003c2.5.0p5",
                  "product_id": "T055046"
                }
              },
              {
                "category": "product_version",
                "name": "2.5.0p5",
                "product": {
                  "name": "Checkmk Checkmk 2.5.0p5",
                  "product_id": "T055046-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:checkmk:checkmk:2.5.0p5"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c2.4.0p31",
                "product": {
                  "name": "Checkmk Checkmk \u003c2.4.0p31",
                  "product_id": "T055047"
                }
              },
              {
                "category": "product_version",
                "name": "2.4.0p31",
                "product": {
                  "name": "Checkmk Checkmk 2.4.0p31",
                  "product_id": "T055047-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:checkmk:checkmk:2.4.0p31"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c2.3.0p48",
                "product": {
                  "name": "Checkmk Checkmk \u003c2.3.0p48",
                  "product_id": "T055048"
                }
              },
              {
                "category": "product_version",
                "name": "2.3.0p48",
                "product": {
                  "name": "Checkmk Checkmk 2.3.0p48",
                  "product_id": "T055048-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:checkmk:checkmk:2.3.0p48"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Checkmk"
          }
        ],
        "category": "vendor",
        "name": "Checkmk"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-7186",
      "product_status": {
        "known_affected": [
          "T055047",
          "T055046",
          "T055048"
        ]
      },
      "release_date": "2026-06-08T22:00:00.000+00:00",
      "title": "CVE-2026-7186"
    },
    {
      "cve": "CVE-2026-7765",
      "product_status": {
        "known_affected": [
          "T055047",
          "T055046",
          "T055048"
        ]
      },
      "release_date": "2026-06-08T22:00:00.000+00:00",
      "title": "CVE-2026-7765"
    },
    {
      "cve": "CVE-2026-8078",
      "product_status": {
        "known_affected": [
          "T055047",
          "T055046",
          "T055048"
        ]
      },
      "release_date": "2026-06-08T22:00:00.000+00:00",
      "title": "CVE-2026-8078"
    },
    {
      "cve": "CVE-2026-8833",
      "product_status": {
        "known_affected": [
          "T055047",
          "T055046",
          "T055048"
        ]
      },
      "release_date": "2026-06-08T22:00:00.000+00:00",
      "title": "CVE-2026-8833"
    },
    {
      "cve": "CVE-2026-9549",
      "product_status": {
        "known_affected": [
          "T055047",
          "T055046",
          "T055048"
        ]
      },
      "release_date": "2026-06-08T22:00:00.000+00:00",
      "title": "CVE-2026-9549"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-7765 (GCVE-0-2026-7765)

FKIE_CVE-2026-7765

GHSA-2X95-FRX4-WH7R

ubuntu-cve-2026-7765

Vulnerability from osv_ubuntu

WID-SEC-W-2026-1817

Tags

Sightings

Nomenclature