Vulnerability-Lookup

GHSA-5WR5-VXHH-X7GM

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

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.

Severity ?

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

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{
  "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": "2026-02-13T18:31:25Z",
  "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: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"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-02-13 15:21 – Updated: 2026-02-13 17:10

Title

Hyland OnBase Timer Services Unauthenticated .NET Remoting RCE

Summary

Severity ?

10 (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

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

VulnCheck

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

	Vendor	Product	Version
	Hyland	OnBase Workflow Timer Service	Affected: 8.0 , ≤ 17.0.x (semver)

Credits

Victor A. Morales, Senior Pentester Team Leader, GM SecTec Inc. VulnCheck

Show details on NVD website

JSON

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      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-26221",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-13T15:37:28.328195Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-02-13T15:37:35.046Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "Hyland.Core.Workflow.NTService.exe"
          ],
          "product": "OnBase Workflow Timer Service",
          "vendor": "Hyland",
          "versions": [
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              "lessThanOrEqual": "17.0.x",
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          "type": "finder",
          "value": "Victor A. Morales, Senior Pentester Team Leader, GM SecTec Inc."
        },
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        }
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
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          "tags": [
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          "url": "https://www.hyland.com/en/solutions/products/onbase"
        },
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          "tags": [
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        },
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          "tags": [
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        }
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    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-26221",
    "datePublished": "2026-02-13T15:21:48.928Z",
    "dateReserved": "2026-02-11T20:08:07.945Z",
    "dateUpdated": "2026-02-13T17:10:26.532Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-5WR5-VXHH-X7GM

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

Tags

Sightings

Nomenclature