Vulnerability-Lookup

CVE-2026-15640 (GCVE-0-2026-15640)

Vulnerability from cvelistv5 – Published: 2026-09-15 23:22 – Updated: 2026-09-16 19:37

Title

Authentication Bypass via SAML Response Manipulation

Summary

Under certain conditions a valid SAML IdP response may be used to impersonate another Secret Server user.

Severity

9.5 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-16 19:37 UTC

CWE

CWE-290 - Authentication bypass by spoofing

Assigner

Delinea mitre root

References

1 reference

URL	Tags
https://delinea.com/security-advisories	vendor-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
Delinea	Secret Server (On-Prem)	Affected: 10.5.0 , ≤ 12.1.3 (custom)	guessed

Credits

Aidan Stansfield - Division 5

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-15640

Vulnerability from fkie_nvd - Published: 2026-09-16 00:17 - Updated: 2026-09-16 20:17

Severity

9.5 (Critical) - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:H

Summary

Under certain conditions a valid SAML IdP response may be used to impersonate another Secret Server user.

References

	URL	Tags
	1443cd92-d354-46d2-9290-d812316ca43a	https://delinea.com/security-advisories

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "Windows"
          ],
          "product": "Secret Server (On-Prem)",
          "vendor": "Delinea",
          "versions": [
            {
              "lessThanOrEqual": "12.1.3",
              "status": "affected",
              "version": "10.5.0",
              "versionType": "custom"
            }
          ]
        }
      ],
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    }
  ],
  "cveTags": [],
  "descriptions": [
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    }
  ],
  "id": "CVE-2026-15640",
  "lastModified": "2026-09-16T20:17:21.333",
  "metrics": {
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          "Safety": "NOT_DEFINED",
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          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.5,
          "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",
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          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
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GHSA-43CM-C736-GJ85

Vulnerability from github – Published: 2026-09-16 00:31 – Updated: 2026-09-16 00:31

Details

Under certain conditions a valid SAML IdP response may be used to impersonate another Secret Server user.

Severity

9.5 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-15640"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-290"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T00:17:03Z",
    "severity": "CRITICAL"
  },
  "details": "Under certain conditions a valid SAML IdP response may be used to impersonate another Secret Server user.",
  "id": "GHSA-43cm-c736-gj85",
  "modified": "2026-09-16T00:31:34Z",
  "published": "2026-09-16T00:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15640"
    },
    {
      "type": "WEB",
      "url": "https://delinea.com/security-advisories"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/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.

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.
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-2026-15640 (GCVE-0-2026-15640)

FKIE_CVE-2026-15640

GHSA-43CM-C736-GJ85

Tags

Sightings

Nomenclature

Related by attack behaviour