Common Weakness Enumeration

CWE-862

Weakness Allowed-with-Review

Missing Authorization

Abstraction: Class · Status: Incomplete

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Dimensions

  • Behavior-Property: Missing
  • Behavior-Type: Authorization
Mapping guidance

This CWE entry is a Class and might have Base-level children that would be more appropriate

Examine children of this entry to see if there is a better fit

Relationships and members
ChildOf: CWE-285 · View CWE-1000
  • Behavior-Property: Improper
ChildOf: CWE-284 · View CWE-1340
  • Behavior-Property: Improper
  • Behavior-Type: Access Control
Modes of introduction
Architecture and Design

OMISSION: This weakness is caused by missing a security tactic during the architecture and design phase.

Authorization weaknesses may arise when a single-user application is ported to a multi-user environment.

Implementation

A developer may introduce authorization weaknesses because of a lack of understanding about the underlying technologies. For example, a developer may assume that attackers cannot modify certain inputs such as headers or cookies.

Operation
Detection methods

Automated Static Analysis

Automated static analysis is useful for detecting commonly-used idioms for authorization. A tool may be able to analyze related configuration files, such as .htaccess in Apache web servers, or detect the usage of commonly-used authorization libraries.

Generally, automated static analysis tools have difficulty detecting custom authorization schemes. In addition, the software's design may include some functionality that is accessible to any user and does not require an authorization check; an automated technique that detects the absence of authorization may report false positives.

Effectiveness: Limited

Automated Dynamic Analysis

Automated dynamic analysis may find many or all possible interfaces that do not require authorization, but manual analysis is required to determine if the lack of authorization violates business logic.

Manual Analysis

This weakness can be detected using tools and techniques that require manual (human) analysis, such as penetration testing, threat modeling, and interactive tools that allow the tester to record and modify an active session.

Specifically, manual static analysis is useful for evaluating the correctness of custom authorization mechanisms.

Effectiveness: Moderate

These may be more effective than strictly automated techniques. This is especially the case with weaknesses that are related to design and business rules. However, manual efforts might not achieve desired code coverage within limited time constraints.

Manual Static Analysis - Binary or Bytecode

According to SOAR [REF-1479], the following detection techniques may be useful:

Cost effective for partial coverage:

Binary / Bytecode disassembler - then use manual analysis for vulnerabilities & anomalies

Effectiveness: SOAR Partial

Dynamic Analysis with Automated Results Interpretation

According to SOAR [REF-1479], the following detection techniques may be useful:

Cost effective for partial coverage:

Web Application Scanner

Web Services Scanner

Database Scanners

Effectiveness: SOAR Partial

Dynamic Analysis with Manual Results Interpretation

According to SOAR [REF-1479], the following detection techniques may be useful:

Cost effective for partial coverage:

Host Application Interface Scanner

Fuzz Tester

Framework-based Fuzzer

Effectiveness: SOAR Partial

Manual Static Analysis - Source Code

According to SOAR [REF-1479], the following detection techniques may be useful:

Cost effective for partial coverage:

Focused Manual Spotcheck - Focused manual analysis of source

Manual Source Code Review (not inspections)

Effectiveness: SOAR Partial

Automated Static Analysis - Source Code

According to SOAR [REF-1479], the following detection techniques may be useful:

Cost effective for partial coverage:

Source code Weakness Analyzer

Context-configured Source Code Weakness Analyzer

Effectiveness: SOAR Partial

Architecture or Design Review

According to SOAR [REF-1479], the following detection techniques may be useful:

Highly cost effective:

Inspection (IEEE 1028 standard) (can apply to requirements, design, source code, etc.)

Formal Methods / Correct-By-Construction

Effectiveness: High

Notes

Terminology

Assuming a user with a given identity, authorization is the process of determining whether that user can access a given resource, based on the user's privileges and any permissions or other access-control specifications that apply to the resource.

Content history
Submission: CWE Content Team · MITRE · 2011-05-24 · CWE 1.13
Contribution: "Mapping CWE to 62443" Sub-Working Group · CWE-CAPEC ICS/OT SIG · 2023-04-25 · CWE 4.11

Suggested mappings to ISA/IEC 62443.

Contribution: Abhi Balakrishnan · 2024-02-29 · CWE 4.16

Provided diagram to improve CWE usability

Modification: CWE Content Team · MITRE · 2011-06-27 · CWE 2.0

updated Demonstrative_Examples, Related_Attack_Patterns, Relationships

Modification: CWE Content Team · MITRE · 2011-09-13 · CWE 2.1

updated Potential_Mitigations, References, Relationships

Modification: CWE Content Team · MITRE · 2012-05-11 · CWE 2.2

updated Demonstrative_Examples, Observed_Examples, References, Relationships

Modification: CWE Content Team · MITRE · 2012-10-30 · CWE 2.3

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2014-02-18 · CWE 2.6

updated Relationships

Modification: CWE Content Team · MITRE · 2014-07-30 · CWE 2.8

updated Detection_Factors

Modification: CWE Content Team · MITRE · 2017-01-19 · CWE 2.10

updated Relationships

Modification: CWE Content Team · MITRE · 2017-11-08 · CWE 3.0

updated Applicable_Platforms, Modes_of_Introduction, References, Relationships

Modification: CWE Content Team · MITRE · 2018-03-27 · CWE 3.1

updated References

Modification: CWE Content Team · MITRE · 2019-06-20 · CWE 3.3

updated Relationships

Modification: CWE Content Team · MITRE · 2020-02-24 · CWE 4.0

updated Relationships

Modification: CWE Content Team · MITRE · 2020-08-20 · CWE 4.2

updated Relationships

Modification: CWE Content Team · MITRE · 2020-12-10 · CWE 4.3

updated Relationships

Modification: CWE Content Team · MITRE · 2021-03-15 · CWE 4.4

updated Alternate_Terms, Observed_Examples

Modification: CWE Content Team · MITRE · 2021-07-20 · CWE 4.5

updated Observed_Examples, Related_Attack_Patterns, Relationships

Modification: CWE Content Team · MITRE · 2021-10-28 · CWE 4.6

updated Relationships

Modification: CWE Content Team · MITRE · 2022-06-28 · CWE 4.8

updated Relationships

Modification: CWE Content Team · MITRE · 2022-10-13 · CWE 4.9

updated Observed_Examples

Modification: CWE Content Team · MITRE · 2023-01-31 · CWE 4.10

updated Description, Potential_Mitigations

Modification: CWE Content Team · MITRE · 2023-04-27 · CWE 4.11

updated References, Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2023-06-29 · CWE 4.12

updated Mapping_Notes, Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2024-11-19 · CWE 4.16

updated Common_Consequences, Description, Diagram, Relationships, Terminology_Notes

Modification: CWE Content Team · MITRE · 2025-09-09 · CWE 4.18

updated Applicable_Platforms, Detection_Factors, Observed_Examples, References

Modification: CWE Content Team · MITRE · 2025-12-11 · CWE 4.19

updated Applicable_Platforms, Relationships, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2026-04-30 · CWE 4.20

updated Applicable_Platforms, Observed_Examples, Relationships

Modification: CWE Content Team · MITRE · 2026-10-28 · CWE 5.0

updated Applicable_Platforms, Dimensions, References, Relationships, Taxonomy_Mappings

19891 vulnerabilities reference this CWE, most recent first.

GHSA-9MP7-PWVH-JCPG

Vulnerability from github – Published: 2026-08-20 00:35 – Updated: 2026-08-20 00:35
VLAI
Details

In Splunk Enterprise 10.4 versions below 10.4.2, an unauthenticated user could cause Splunk Enterprise to reload token-signing keys through the Representational State Transfer (REST) API. The vulnerability does not affect Splunk Enterprise versions below 10.4. The vulnerability is possible because the REST API does not require authentication or the change_authentication capability for the token-key reload action. For more information see Define roles on the Splunk platform with capabilities (https://help.splunk.com/en/splunk-enterprise/administer/manage-users-and-security/10.4/manage-splunk-platform-users-and-roles/define-roles-on-the-splunk-platform-with-capabilities) in the Splunk documentation.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-76340"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-19T22:17:18Z",
    "severity": "MODERATE"
  },
  "details": "In Splunk Enterprise 10.4 versions below 10.4.2, an unauthenticated user could cause Splunk Enterprise to reload token-signing keys through the Representational State Transfer (REST) API. The vulnerability does not affect Splunk Enterprise versions below 10.4. The vulnerability is possible because the REST API does not require authentication or the change_authentication capability for the token-key reload action. For more information see Define roles on the Splunk platform with capabilities (https://help.splunk.com/en/splunk-enterprise/administer/manage-users-and-security/10.4/manage-splunk-platform-users-and-roles/define-roles-on-the-splunk-platform-with-capabilities) in the Splunk documentation.",
  "id": "GHSA-9mp7-pwvh-jcpg",
  "modified": "2026-08-20T00:35:00Z",
  "published": "2026-08-20T00:35:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76340"
    },
    {
      "type": "WEB",
      "url": "https://advisory.splunk.com/advisories/SVD-2026-0801"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-9MQG-4JV7-4M83

Vulnerability from github – Published: 2025-01-14 03:31 – Updated: 2025-01-14 03:31
VLAI
Details

An obsolete functionality in SAP NetWeaver Application Server ABAP did not perform necessary authorization checks. Because of this, an authenticated attacker could obtain information that would otherwise be restricted. It has no impact on integrity or availability on the application.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-0068"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-01-14T01:15:17Z",
    "severity": "MODERATE"
  },
  "details": "An obsolete functionality in SAP NetWeaver Application Server ABAP did not perform necessary authorization checks. Because of this, an authenticated attacker could obtain information that would otherwise be restricted. It has no impact on integrity or availability on the application.",
  "id": "GHSA-9mqg-4jv7-4m83",
  "modified": "2025-01-14T03:31:42Z",
  "published": "2025-01-14T03:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-0068"
    },
    {
      "type": "WEB",
      "url": "https://me.sap.com/notes/3550674"
    },
    {
      "type": "WEB",
      "url": "https://url.sap/sapsecuritypatchday"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-9MQG-8RMC-J296

Vulnerability from github – Published: 2025-04-03 15:31 – Updated: 2026-04-01 18:34
VLAI
Details

Missing Authorization vulnerability in gunnarpayday Payday allows Exploiting Incorrectly Configured Access Control Security Levels. This issue affects Payday: from n/a through 3.3.12.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-31876"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-03T14:15:41Z",
    "severity": "MODERATE"
  },
  "details": "Missing Authorization vulnerability in gunnarpayday Payday allows Exploiting Incorrectly Configured Access Control Security Levels. This issue affects Payday: from n/a through 3.3.12.",
  "id": "GHSA-9mqg-8rmc-j296",
  "modified": "2026-04-01T18:34:28Z",
  "published": "2025-04-03T15:31:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-31876"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/wordpress/plugin/payday/vulnerability/wordpress-payday-plugin-3-3-12-broken-access-control-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-9MR9-9XMV-5W3C

Vulnerability from github – Published: 2026-11-10 00:31 – Updated: 2026-11-10 00:31
VLAI
Details

Pig before 4.1.2 contains a missing authorization vulnerability in SysClientController that allows authenticated users without client-management permission to retrieve OAuth2 client secrets via GET /client/{clientId} and GET /client/export. Attackers can fetch clientSecret values for seed clients like pig, app, and daemon or export the client table, then obtain tokens using those clients' configured grant types.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-125377"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-11-10T00:17:10Z",
    "severity": "HIGH"
  },
  "details": "Pig before 4.1.2 contains a missing authorization vulnerability in SysClientController that allows authenticated users without client-management permission to retrieve OAuth2 client secrets via GET /client/{clientId} and GET /client/export. Attackers can fetch clientSecret values for seed clients like pig, app, and daemon or export the client table, then obtain tokens using those clients\u0027 configured grant types.",
  "id": "GHSA-9mr9-9xmv-5w3c",
  "modified": "2026-11-10T00:31:46Z",
  "published": "2026-11-10T00:31:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125377"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pig-mesh/pig/issues/1298"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pig-mesh/pig/commit/0fffbf14d393f30a0272a3cdf0a54efd45e0d9e3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pig-mesh/pig"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pig-mesh/pig/blob/a0d273afd3adc6678b065c0f2d25433541343ad7/pig-upms/pig-upms-biz/src/main/java/com/pig4cloud/pig/admin/controller/SysClientController.java#L69-L82"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pig-mesh/pig/releases/tag/v4.1.2"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/pig-before-4.1.2-missing-authorization-exposes-oauth2-client-secrets-via-client"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/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",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-9MRR-4HRR-WF55

Vulnerability from github – Published: 2022-05-04 00:00 – Updated: 2022-05-12 00:01
VLAI
Details

In aee daemon, there is a possible information disclosure due to a missing permission check. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS06419017; Issue ID: ALPS06419017.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2022-20098"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-05-03T20:15:00Z",
    "severity": "MODERATE"
  },
  "details": "In aee daemon, there is a possible information disclosure due to a missing permission check. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS06419017; Issue ID: ALPS06419017.",
  "id": "GHSA-9mrr-4hrr-wf55",
  "modified": "2022-05-12T00:01:53Z",
  "published": "2022-05-04T00:00:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-20098"
    },
    {
      "type": "WEB",
      "url": "https://corp.mediatek.com/product-security-bulletin/May-2022"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-9MV3-Q2X2-PJQC

Vulnerability from github – Published: 2025-01-07 12:31 – Updated: 2026-04-01 18:33
VLAI
Details

Missing Authorization vulnerability in osamaesh WP Visitor Statistics (Real Time Traffic) allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WP Visitor Statistics (Real Time Traffic): from n/a through 7.3.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-22304"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-01-07T11:15:14Z",
    "severity": "MODERATE"
  },
  "details": "Missing Authorization vulnerability in osamaesh WP Visitor Statistics (Real Time Traffic) allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WP Visitor Statistics (Real Time Traffic): from n/a through 7.3.",
  "id": "GHSA-9mv3-q2x2-pjqc",
  "modified": "2026-04-01T18:33:02Z",
  "published": "2025-01-07T12:31:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-22304"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/wordpress/plugin/wp-stats-manager/vulnerability/wordpress-wp-visitor-statistics-plugin-7-2-broken-access-control-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-9MVQ-82C3-MVHH

Vulnerability from github – Published: 2023-07-06 21:15 – Updated: 2024-04-04 05:49
VLAI
Details

The WPCS – WordPress Currency Switcher Professional plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the create function in versions up to, and including, 1.1.9. This makes it possible for authenticated attackers, with subscriber-level permissions and above, to create a custom drop-down currency switcher.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-2555"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-06-09T06:16:08Z",
    "severity": "MODERATE"
  },
  "details": "The WPCS \u2013 WordPress Currency Switcher Professional plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the create function in versions up to, and including, 1.1.9. This makes it possible for authenticated attackers, with subscriber-level permissions and above, to create a custom drop-down currency switcher.",
  "id": "GHSA-9mvq-82c3-mvhh",
  "modified": "2024-04-04T05:49:35Z",
  "published": "2023-07-06T21:15:07Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-2555"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset/2911049/currency-switcher"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/dd6b5d6d-5f5b-4b38-a25a-02cc1c041d37?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-9MVX-7MFC-HRVH

Vulnerability from github – Published: 2023-09-04 03:30 – Updated: 2024-04-04 07:24
VLAI
Details

In vowifiservice, there is a possible missing permission check.This could lead to local denial of service with no additional execution privileges

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-38463"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-09-04T02:15:09Z",
    "severity": "MODERATE"
  },
  "details": "In vowifiservice, there is a possible missing permission check.This could lead to local denial of service with no additional execution privileges",
  "id": "GHSA-9mvx-7mfc-hrvh",
  "modified": "2024-04-04T07:24:03Z",
  "published": "2023-09-04T03:30:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-38463"
    },
    {
      "type": "WEB",
      "url": "https://www.unisoc.com/en_us/secy/announcementDetail/https://www.unisoc.com/en_us/secy/announcementDetail/1698296481653522434"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-9MXG-MC29-5Q3G

Vulnerability from github – Published: 2026-02-05 21:32 – Updated: 2026-02-05 21:32
VLAI
Details

Tanium addressed an improper access controls vulnerability in Interact.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-15289"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-05T19:15:52Z",
    "severity": "LOW"
  },
  "details": "Tanium addressed an improper access controls vulnerability in Interact.",
  "id": "GHSA-9mxg-mc29-5q3g",
  "modified": "2026-02-05T21:32:41Z",
  "published": "2026-02-05T21:32:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-15289"
    },
    {
      "type": "WEB",
      "url": "https://security.tanium.com/TAN-2025-033"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-9MXH-6WP4-9V6P

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-10-15 12:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: Correctly cap ZCR_EL2 provided by a guest hypervisor

ZCR_EL2 can be updated by a VHE guest hypervisor either using ZCR_EL2 (which traps) or ZCR_EL1 (which does not trap). KVM handles both in different way:

  • on ZCR_EL2 trap, ZCR_EL2.LEN is immediately capped at the VM's own VL limit. This has the potential to break existing SW that relies on the full LEN field to be stateful.

  • on ZCR_EL1 access, we do absolutely nothing.

On restoring the SVE context for an L2 guest, we directly restore the guest hypervisor's view of ZCR_EL2 into the physical ZCR_EL2. If the guest's view of the register was updated using the ZCR_EL2 accessor, the value has already been sanitised (with the caveat mentioned above).

But if the guest used ZCR_EL1, the raw value is written into the HW, and the L2 guest can now access VLs that it shouldn't.

Fix all the above by moving the VL capping to the restore points, ensuring that:

  • the HW is always programmed with a capped value, irrespective of the accessor being used,

  • the ZCR_EL2.LEN field is always completely stateful, irrespective of the accessor being used.

Additionally, move ZCR_EL2 to be a sanitised register, ensuring that only the LEN field is actually stateful. This requires some creative construction of the RES0 mask, as the sysreg generation script does not yet generate RAZ/WI fields.

[maz: rewrote commit message, tidy up access_zcr_el2()]

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-63941"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20",
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:12Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Correctly cap ZCR_EL2 provided by a guest hypervisor\n\nZCR_EL2 can be updated by a VHE guest hypervisor either using ZCR_EL2\n(which traps) or ZCR_EL1 (which does not trap). KVM handles both in\ndifferent way:\n\n- on ZCR_EL2 trap, ZCR_EL2.LEN is immediately capped at the VM\u0027s own\n  VL limit. This has the potential to break existing SW that relies\n  on the full LEN field to be stateful.\n\n- on ZCR_EL1 access, we do absolutely nothing.\n\nOn restoring the SVE context for an L2 guest, we directly restore the\nguest hypervisor\u0027s view of ZCR_EL2 into the physical ZCR_EL2. If the\nguest\u0027s view of the register was updated using the ZCR_EL2 accessor,\nthe value has already been sanitised (with the caveat mentioned above).\n\nBut if the guest used ZCR_EL1, the raw value is written into the HW,\nand the L2 guest can now access VLs that it shouldn\u0027t.\n\nFix all the above by moving the VL capping to the restore points,\nensuring that:\n\n- the HW is always programmed with a capped value, irrespective of\n  the accessor being used,\n\n- the ZCR_EL2.LEN field is always completely stateful, irrespective\n  of the accessor being used.\n\nAdditionally, move ZCR_EL2 to be a sanitised register, ensuring that\nonly the LEN field is actually stateful. This requires some creative\nconstruction of the RES0 mask, as the sysreg generation script does\nnot yet generate RAZ/WI fields.\n\n[maz: rewrote commit message, tidy up access_zcr_el2()]",
  "id": "GHSA-9mxh-6wp4-9v6p",
  "modified": "2026-10-15T12:30:38Z",
  "published": "2026-07-19T18:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63941"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2090c1a2368339eab0e14dcde12fdf6a5ea6359d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/742a9b5ccd8c46caf983ca90c94f855466968e34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83726330748981372bde86ed5411d7b306612991"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Mitigation
Architecture and Design
  • Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) [REF-229] to enforce the roles at the appropriate boundaries.
  • Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
Mitigation
Architecture and Design

Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor [REF-7].

Mitigation MIT-4.4
Architecture and Design

Strategy: Libraries or Frameworks

  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • For example, consider using authorization frameworks such as the JAAS Authorization Framework [REF-233] and the OWASP ESAPI Access Control feature [REF-45].
Mitigation
Architecture and Design
  • For web applications, make sure that the access control mechanism is enforced correctly at the server side on every page. Users should not be able to access any unauthorized functionality or information by simply requesting direct access to that page.
  • One way to do this is to ensure that all pages containing sensitive information are not cached, and that all such pages restrict access to requests that are accompanied by an active and authenticated session token associated with a user who has the required permissions to access that page.
Mitigation
System Configuration Installation

Use the access control capabilities of your operating system and server environment and define your access control lists accordingly. Use a "default deny" policy when defining these ACLs.

CAPEC-665: Exploitation of Thunderbolt Protection Flaws

An adversary leverages a firmware weakness within the Thunderbolt protocol, on a computing device to manipulate Thunderbolt controller firmware in order to exploit vulnerabilities in the implementation of authorization and verification schemes within Thunderbolt protection mechanisms. Upon gaining physical access to a target device, the adversary conducts high-level firmware manipulation of the victim Thunderbolt controller SPI (Serial Peripheral Interface) flash, through the use of a SPI Programing device and an external Thunderbolt device, typically as the target device is booting up. If successful, this allows the adversary to modify memory, subvert authentication mechanisms, spoof identities and content, and extract data and memory from the target device. Currently 7 major vulnerabilities exist within Thunderbolt protocol with 9 attack vectors as noted in the Execution Flow.