Vulnerability-Lookup

CVE-2026-46623 (GCVE-0-2026-46623)

Vulnerability from cvelistv5 – Published: 2026-09-15 09:52 – Updated: 2026-09-15 09:52

Title

OpenAM Account Takeover via Unverified Password Change in OAuth2 Module

Summary

Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the OAuth2 authentication module updates an existing local account with profile attributes that can include userPassword and inetUserStatus, rewriting the password to the username and reactivating disabled accounts. The missing OAuth.removeRestrictedAccountUpdateAttributes filtering permits these credential and status fields to reach the account update. With account creation enabled, repeated OAuth login causes the default ldapService chain to accept the username as both identifier and password, allowing an unauthenticated attacker to take over the local account without interacting with the identity provider. The rewrite can be denied for usernames shorter than the configured minimum password length. This issue is fixed in version 16.1.1.

Severity

7.4 (High)


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

CWE

CWE-620 - Unverified Password Change
CWE-1391 - Use of Weak Credentials

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/OpenIdentityPlatform/OpenAM/se…	x_refsource_CONFIRM
https://github.com/OpenIdentityPlatform/OpenAM/co…	x_refsource_MISC
https://github.com/OpenIdentityPlatform/OpenAM/re…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
OpenIdentityPlatform	OpenAM	Affected: < 16.1.1	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "OpenAM",
          "vendor": "OpenIdentityPlatform",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 16.1.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the OAuth2 authentication module updates an existing local account with profile attributes that can include userPassword and inetUserStatus, rewriting the password to the username and reactivating disabled accounts. The missing OAuth.removeRestrictedAccountUpdateAttributes filtering permits these credential and status fields to reach the account update. With account creation enabled, repeated OAuth login causes the default ldapService chain to accept the username as both identifier and password, allowing an unauthenticated attacker to take over the local account without interacting with the identity provider. The rewrite can be denied for usernames shorter than the configured minimum password length. This issue is fixed in version 16.1.1."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-620",
              "description": "CWE-620: Unverified Password Change",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-1391",
              "description": "CWE-1391: Use of Weak Credentials",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T09:52:08.356Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf57-4mp6-m85x",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf57-4mp6-m85x"
        },
        {
          "name": "https://github.com/OpenIdentityPlatform/OpenAM/commit/7993f6d2121c915a473415302b4c939e34b2842f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OpenIdentityPlatform/OpenAM/commit/7993f6d2121c915a473415302b4c939e34b2842f"
        },
        {
          "name": "https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1"
        }
      ],
      "source": {
        "advisory": "GHSA-gf57-4mp6-m85x",
        "discovery": "UNKNOWN"
      },
      "title": "OpenAM Account Takeover via Unverified Password Change in OAuth2 Module"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-46623",
    "datePublished": "2026-09-15T09:52:08.356Z",
    "dateReserved": "2026-05-15T19:34:14.012Z",
    "dateUpdated": "2026-09-15T09:52:08.356Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46623",
      "date": "2026-09-15",
      "epss": "0.00669",
      "percentile": "0.50069"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46623\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-09-15T10:17:04.920\",\"lastModified\":\"2026-09-15T10:17:04.920\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the OAuth2 authentication module updates an existing local account with profile attributes that can include userPassword and inetUserStatus, rewriting the password to the username and reactivating disabled accounts. The missing OAuth.removeRestrictedAccountUpdateAttributes filtering permits these credential and status fields to reach the account update. With account creation enabled, repeated OAuth login causes the default ldapService chain to accept the username as both identifier and password, allowing an unauthenticated attacker to take over the local account without interacting with the identity provider. The rewrite can be denied for usernames shorter than the configured minimum password length. This issue is fixed in version 16.1.1.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"OpenIdentityPlatform\",\"product\":\"OpenAM\",\"versions\":[{\"version\":\"\u003c 16.1.1\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/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\",\"baseScore\":7.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"ACTIVE\",\"vulnConfidentialityImpact\":\"HIGH\",\"vulnIntegrityImpact\":\"HIGH\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-620\"},{\"lang\":\"en\",\"value\":\"CWE-1391\"}]}],\"references\":[{\"url\":\"https://github.com/OpenIdentityPlatform/OpenAM/commit/7993f6d2121c915a473415302b4c939e34b2842f\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf57-4mp6-m85x\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}

FKIE_CVE-2026-46623

Vulnerability from fkie_nvd - Published: 2026-09-15 10:17 - Updated: 2026-09-15 10:17

Severity

7.4 (High) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/OpenIdentityPlatform/OpenAM/commit/7993f6d2121c915a473415302b4c939e34b2842f
	security-advisories@github.com	https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1
	security-advisories@github.com	https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf57-4mp6-m85x

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "OpenAM",
          "vendor": "OpenIdentityPlatform",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 16.1.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the OAuth2 authentication module updates an existing local account with profile attributes that can include userPassword and inetUserStatus, rewriting the password to the username and reactivating disabled accounts. The missing OAuth.removeRestrictedAccountUpdateAttributes filtering permits these credential and status fields to reach the account update. With account creation enabled, repeated OAuth login causes the default ldapService chain to accept the username as both identifier and password, allowing an unauthenticated attacker to take over the local account without interacting with the identity provider. The rewrite can be denied for usernames shorter than the configured minimum password length. This issue is fixed in version 16.1.1."
    }
  ],
  "id": "CVE-2026-46623",
  "lastModified": "2026-09-15T10:17:04.920",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "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": "ACTIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-15T10:17:04.920",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/OpenIdentityPlatform/OpenAM/commit/7993f6d2121c915a473415302b4c939e34b2842f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf57-4mp6-m85x"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-620"
        },
        {
          "lang": "en",
          "value": "CWE-1391"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-GF57-4MP6-M85X

Vulnerability from github – Published: 2026-06-26 17:33 – Updated: 2026-06-26 17:33

Summary

OpenAM Account Takeover via Unverified Password Change in OAuth2 Module

Details

Summary

Description

An Unverified Password Change (CWE-620) and Use of Weak Credentials (CWE-1391) issue in OpenAM's OAuth2 authentication module silently rewrites a local user's password to the literal string of their username on OAuth2 re-login of an existing account. The default ldapService chain then accepts the username as the password for that user, allowing an unauthenticated attacker to obtain a session via the standard authenticate endpoint with both username and password set to the username, without any IdP interaction. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.

Impact

OpenAM Community Edition deployments through version 16.0.6 that use the OAuth2 authentication module with account creation enabled (the default) are potentially affected. After two OAuth logins of a given user, that user's local password becomes their username, and the account is reachable through the default ldapService chain with username as both identifier and password. For pre-existing users whose IdP profile resolves against an existing local identifier, the rewrite fires on the very first re-login.

Usernames shorter than the default minimum password length have the rewrite silently denied (so very short administrative accounts are not affected), and the same update path marks accounts active on every OAuth login, silently reactivating disabled accounts.

Successful exploitation grants an unauthenticated attacker a session carrying the victim principal's privileges.

Patch

This has been patched in OpenAM Community Edition version 16.1.1. Users are encouraged to update to the latest release.

Severity

8.7 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.openidentityplatform.openam:openam-auth-oauth2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "16.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-46623"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1391",
      "CWE-620"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-26T17:33:35Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\n**Description**\n\nAn Unverified Password Change (CWE-620) and Use of Weak Credentials (CWE-1391) issue in OpenAM\u0027s OAuth2 authentication module silently rewrites a local user\u0027s password to the literal string of their username on OAuth2 re-login of an existing account. The default ldapService chain then accepts the username as the password for that user, allowing an unauthenticated attacker to obtain a session via the standard authenticate endpoint with both username and password set to the username, without any IdP interaction. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.\n\n## Impact\nOpenAM Community Edition deployments through version 16.0.6 that use the OAuth2 authentication module with account creation enabled (the default) are potentially affected. After two OAuth logins of a given user, that user\u0027s local password becomes their username, and the account is reachable through the default ldapService chain with username as both identifier and password. For pre-existing users whose IdP profile resolves against an existing local identifier, the rewrite fires on the very first re-login.\n\nUsernames shorter than the default minimum password length have the rewrite silently denied (so very short administrative accounts are not affected), and the same update path marks accounts active on every OAuth login, silently reactivating disabled accounts. \n\nSuccessful exploitation grants an unauthenticated attacker a session carrying the victim principal\u0027s privileges.\n\n## Patch\nThis has been patched in OpenAM Community Edition version 16.1.1. Users are encouraged to update to the latest release.",
  "id": "GHSA-gf57-4mp6-m85x",
  "modified": "2026-06-26T17:33:35Z",
  "published": "2026-06-26T17:33:35Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf57-4mp6-m85x"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/OpenIdentityPlatform/OpenAM"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenAM Account Takeover via Unverified Password Change in OAuth2 Module"
}

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.

Action not permitted

CVE-2026-46623 (GCVE-0-2026-46623)

FKIE_CVE-2026-46623

GHSA-GF57-4MP6-M85X

Summary

Impact

Patch

Tags

Sightings

Nomenclature