Vulnerability-Lookup

CVE-2026-88920 (GCVE-0-2026-88920)

Vulnerability from cvelistv5 – Published: 2026-09-30 11:58 – Updated: 2026-09-30 19:48

Title

Apache WSS4J: SAML Sender-Vouches Authentication Bypass

Summary

An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.

Severity

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 2026-09-30 19:48 UTC

CWE

CWE-287 - Improper Authentication

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 1075 records in the last 180 days details

References

2 references

URL	Tags
https://lists.apache.org/thread.html/grt43m3bgbzz…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version	CPE status
Apache Software Foundation	Apache WSS4J	Affected: 4.0.0 , < 4.0.2 (semver) Affected: 3.0.0 , < 3.0.6 (semver) Affected: 0 , < 2.4.4 (semver)	guessed

Credits

Reported by n0mi1k

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-88920

Vulnerability from fkie_nvd - Published: 2026-09-30 12:17 - Updated: 2026-10-02 20:17

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
	security@apache.org	https://lists.apache.org/thread.html/grt43m3bgbzz0mk0cnho3rcybb1j01z9	Mailing List, Vendor Advisory
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/09/30/10	Mailing List, Third Party Advisory

Impacted products

Vendor	Product	Version
apache	wss4j	*
apache	wss4j	*
apache	wss4j	*

JSON

To clipboard

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  "published": "2026-09-30T12:17:14.203",
  "references": [
    {
      "source": "security@apache.org",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ],
      "url": "https://lists.apache.org/thread.html/grt43m3bgbzz0mk0cnho3rcybb1j01z9"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/09/30/10"
    }
  ],
  "sourceIdentifier": "security@apache.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

GHSA-4C9G-74H5-78R7

Vulnerability from github – Published: 2026-09-30 12:35 – Updated: 2026-09-30 15:31

Details

Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-88920"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-30T12:17:14Z",
    "severity": null
  },
  "details": "An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key.\n\nUsers are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.",
  "id": "GHSA-4c9g-74h5-78r7",
  "modified": "2026-09-30T15:31:21Z",
  "published": "2026-09-30T12:35:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88920"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/grt43m3bgbzz0mk0cnho3rcybb1j01z9"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/30/10"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

UBUNTU-CVE-2026-88920 (CVE-2026-88920)

Vulnerability from osv_ubuntu – Published: 2026-09-30 12:17 – Updated: 2026-10-17 09:54 – Source website

Details

Severity

9.8 (Critical)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-88920	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-88920	REPORT
	https://lists.apache.org/thread.html/grt43m3bgbzz…	REPORT
	http://www.openwall.com/lists/oss-security/2026/0…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwss4j-java",
            "binary_version": "1.6.15-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "wss4j",
        "purl": "pkg:deb/ubuntu/wss4j@1.6.15-2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.15-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwss4j-java",
            "binary_version": "1.6.19-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "wss4j",
        "purl": "pkg:deb/ubuntu/wss4j@1.6.19-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.19-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwss4j-java",
            "binary_version": "1.6.19-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "wss4j",
        "purl": "pkg:deb/ubuntu/wss4j@1.6.19-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.19-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwss4j-java",
            "binary_version": "1.6.19-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "wss4j",
        "purl": "pkg:deb/ubuntu/wss4j@1.6.19-2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.19-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwss4j-java",
            "binary_version": "1.6.19-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "wss4j",
        "purl": "pkg:deb/ubuntu/wss4j@1.6.19-3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.19-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwss4j-java",
            "binary_version": "1.6.19-4build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "wss4j",
        "purl": "pkg:deb/ubuntu/wss4j@1.6.19-4build1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.19-4build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwss4j-java",
            "binary_version": "1.6.19-4build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "wss4j",
        "purl": "pkg:deb/ubuntu/wss4j@1.6.19-4build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.19-4",
        "1.6.19-4build1"
      ]
    }
  ],
  "aliases": [],
  "details": "An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.",
  "id": "UBUNTU-CVE-2026-88920",
  "modified": "2026-10-17T09:54:16Z",
  "published": "2026-09-30T12:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-88920"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-88920"
    },
    {
      "type": "REPORT",
      "url": "https://lists.apache.org/thread.html/grt43m3bgbzz0mk0cnho3rcybb1j01z9"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/30/10"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "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": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-88920"
  ]
}

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

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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-2026-88920 (GCVE-0-2026-88920)

FKIE_CVE-2026-88920

GHSA-4C9G-74H5-78R7

UBUNTU-CVE-2026-88920 (CVE-2026-88920)

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Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour