Vulnerability-Lookup

CVE-2026-26221 (GCVE-0-2026-26221)

Vulnerability from cvelistv5 – Published: 2026-02-13 15:21 – Updated: 2026-05-25 23:41

Title

Hyland OnBase Timer Service Unauthenticated .NET Remoting RCE

Summary

Hyland OnBase contains an unauthenticated .NET Remoting exposure in the OnBase Workflow Timer Service (Hyland.Core.Workflow.NTService.exe). An attacker who can reach the service can send crafted .NET Remoting requests to default HTTP channel endpoints on TCP/8900 (e.g., TimerServiceAPI.rem and TimerServiceEvents.rem for Workflow) to trigger unsafe object unmarshalling, enabling arbitrary file read/write. By writing attacker-controlled content into web-accessible locations or chaining with other OnBase features, this can lead to remote code execution. The same primitive can be abused by supplying a UNC path to coerce outbound NTLM authentication (SMB coercion) to an attacker-controlled host.

Severity

9.3 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-13 15:37 UTC

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 8179 records in the last 180 days details

References

3 references

URL	Tags
https://www.hyland.com/en/solutions/products/onbase	product
https://community.hyland.com/resources/bulletins-…	vendor-advisorymitigationpermissions-required
https://www.vulncheck.com/advisories/hyland-onbas…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
Hyland	OnBase Workflow Timer Service	Affected: 8.0 , ≤ 17.0.0 (custom) cpe:2.3:a:hyland:onbase::::::::

Credits

Victor A. Morales, Senior Pentester Team Leader, GM Sectec, Corp. VulnCheck

Show details on NVD website

JSON

To clipboard

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              "tags": [
                "third-party-advisory"
              ],
              "url": "https://www.vulncheck.com/advisories/hyland-onbase-timer-services-unauthenticated-net-remoting-rce"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "Hyland OnBase Timer Service Unauthenticated .NET Remoting RCE",
          "workarounds": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "It is recommended that customers immediately convert to the in-servicing module, Unity Scheduler, and uninstall the Workflow Timer Service (Hyland.Core.Workflow.NTService.exe). Starting with OnBase 16, Unity Scheduler is the recommended replacement. It is recommended customers using versions prior to 16 upgrade to an in-servicing release of OnBase and leverage Unity Scheduler.\u003cbr\u003e"
                }
              ],
              "value": "It is recommended that customers immediately convert to the in-servicing module, Unity Scheduler, and uninstall the Workflow Timer Service (Hyland.Core.Workflow.NTService.exe). Starting with OnBase 16, Unity Scheduler is the recommended replacement. It is recommended customers using versions prior to 16 upgrade to an in-servicing release of OnBase and leverage Unity Scheduler."
            }
          ],
          "x_generator": {
            "engine": "vulncheck"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "assignerShortName": "VulnCheck",
        "cveId": "CVE-2026-26221",
        "datePublished": "2026-02-13T15:21:48.928Z",
        "dateReserved": "2026-02-11T20:08:07.945Z",
        "dateUpdated": "2026-05-25T23:41:44.966Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-26221

Vulnerability from fkie_nvd - Published: 2026-02-13 16:16 - Updated: 2026-06-17 10:25

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://community.hyland.com/resources/bulletins-and-notices/223223-security-update-onbase-workflow-timer-service-bulletin-ob2025-03
	disclosure@vulncheck.com	https://www.hyland.com/en/solutions/products/onbase
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/hyland-onbase-timer-services-unauthenticated-net-remoting-rce

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "Hyland.Core.Workflow.NTService.exe"
          ],
          "product": "OnBase Workflow Timer Service",
          "vendor": "Hyland",
          "versions": [
            {
              "lessThanOrEqual": "17.0.0",
              "status": "affected",
              "version": "8.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "disclosure@vulncheck.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Hyland OnBase contains an unauthenticated .NET Remoting exposure in the OnBase Workflow Timer Service (Hyland.Core.Workflow.NTService.exe). An attacker who can reach the service can send crafted .NET Remoting requests to default HTTP channel endpoints on TCP/8900 (e.g., TimerServiceAPI.rem and TimerServiceEvents.rem for Workflow) to trigger unsafe object unmarshalling, enabling arbitrary file read/write. By writing attacker-controlled content into web-accessible locations or chaining with other OnBase features, this can lead to remote code execution. The same primitive can be abused by supplying a UNC path to coerce outbound NTLM authentication (SMB coercion) to an attacker-controlled host."
    },
    {
      "lang": "es",
      "value": "Hyland OnBase contiene una exposici\u00f3n de .NET Remoting sin autenticaci\u00f3n en el Servicio de Temporizador de Flujo de Trabajo de OnBase (Hyland.Core.Workflow.NTService.exe). Un atacante que puede alcanzar el servicio puede enviar solicitudes de .NET Remoting manipuladas a los puntos finales de canal HTTP predeterminados en TCP/8900 (p. ej., TimerServiceAPI.rem y TimerServiceEvents.rem para Flujo de Trabajo) para activar la deserializaci\u00f3n insegura de objetos, lo que permite la lectura/escritura arbitraria de archivos. Al escribir contenido controlado por el atacante en ubicaciones accesibles por la web o encadenando con otras caracter\u00edsticas de OnBase, esto puede llevar a la ejecuci\u00f3n remota de c\u00f3digo. La misma primitiva puede ser abusada al proporcionar una ruta UNC para forzar la autenticaci\u00f3n NTLM saliente (coerci\u00f3n SMB) a un host controlado por el atacante."
    }
  ],
  "id": "CVE-2026-26221",
  "lastModified": "2026-06-17T10:25:58.037",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-26221",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-13T15:37:28.328195Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-13T16:16:11.683",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://community.hyland.com/resources/bulletins-and-notices/223223-security-update-onbase-workflow-timer-service-bulletin-ob2025-03"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.hyland.com/en/solutions/products/onbase"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/hyland-onbase-timer-services-unauthenticated-net-remoting-rce"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-5WR5-VXHH-X7GM

Vulnerability from github – Published: 2026-02-13 18:31 – Updated: 2026-04-14 00:31

Details

Severity

9.8 (Critical)


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

10.0 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-26221"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-13T16:16:11Z",
    "severity": "CRITICAL"
  },
  "details": "Hyland OnBase contains an unauthenticated .NET Remoting exposure in the OnBase Workflow Timer Service (Hyland.Core.Workflow.NTService.exe). An attacker who can reach the service can send crafted .NET Remoting requests to default HTTP channel endpoints on TCP/8900 (e.g., TimerServiceAPI.rem and TimerServiceEvents.rem for Workflow) to trigger unsafe object unmarshalling, enabling arbitrary file read/write. By writing attacker-controlled content into web-accessible locations or chaining with other OnBase features, this can lead to remote code execution. The same primitive can be abused by supplying a UNC path to coerce outbound NTLM authentication (SMB coercion) to an attacker-controlled host.",
  "id": "GHSA-5wr5-vxhh-x7gm",
  "modified": "2026-04-14T00:31:11Z",
  "published": "2026-02-13T18:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26221"
    },
    {
      "type": "WEB",
      "url": "https://community.hyland.com/resources/bulletins-and-notices/223223-security-update-onbase-workflow-timer-service-bulletin-ob2025-03"
    },
    {
      "type": "WEB",
      "url": "https://www.hyland.com/en/solutions/products/onbase"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/hyland-onbase-timer-services-unauthenticated-net-remoting-rce"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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"
    }
  ]
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-26221 (GCVE-0-2026-26221)

FKIE_CVE-2026-26221

GHSA-5WR5-VXHH-X7GM

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour