CWE-302

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 10.0.9"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.Authentication.Negotiate"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.0.0"
            },
            {
              "fixed": "10.0.10"
            }
          ],
          "type": "ECOSYSTEM"
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    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 9.0.17"
      },
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        "name": "Microsoft.AspNetCore.Authentication.Negotiate"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.0.0"
            },
            {
              "fixed": "9.0.18"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.0.28"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.Authentication.Negotiate"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0"
            },
            {
              "fixed": "8.0.29"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-47303"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-302",
      "CWE-863",
      "CWE-90"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-21T16:07:53Z",
    "nvd_published_at": "2026-07-14T19:17:08Z",
    "severity": "HIGH"
  },
  "details": "## Executive summary\n\nMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.\n\nAn elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/**TBD**\n\n## CVSS Details\n\n- **Version:** 3.1\n- **Severity:** High\n- **Score:** 8.8\n- **Vector:** `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`\n- **Weakness:** CWE-302 (Authentication Bypass by Assumed-Immutable Data), CWE-863 (Incorrect Authorization), CWE-90 (Improper Neutralization of Special Elements used in an LDAP Query (\u0027LDAP Injection\u0027))\n\n## Affected Platforms\n\n- **Platforms:** All\n- **Architectures:** All\n\n## \u003ca name=\"affected-packages\"\u003e\u003c/a\u003eAffected Packages\nThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below\n\n### \u003ca name=\".NET 10\"\u003e\u003c/a\u003e.NET 10\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.Authentication.Negotiate](https://www.nuget.org/packages/Microsoft.AspNetCore.Authentication.Negotiate)               | \u003e= 10.0.0, \u003c= 10.0.9 | 10.0.10\n\n### \u003ca name=\".NET 9\"\u003e\u003c/a\u003e.NET 9\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.Authentication.Negotiate](https://www.nuget.org/packages/Microsoft.AspNetCore.Authentication.Negotiate)               | \u003e= 9.0.0, \u003c= 9.0.17 | 9.0.18\n\n### \u003ca name=\".NET 8\"\u003e\u003c/a\u003e.NET 8\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.Authentication.Negotiate](https://www.nuget.org/packages/Microsoft.AspNetCore.Authentication.Negotiate)               | \u003e= 8.0.0, \u003c= 8.0.28 | 8.0.29\n\n## Advisory FAQ\n\n### \u003ca name=\"how-affected\"\u003e\u003c/a\u003eHow do I know if I am affected?\n\nIf using a package listed in [affected packages](#affected-packages), you\u0027re exposed to the vulnerability.\n\n### \u003ca name=\"how-fix\"\u003e\u003c/a\u003eHow do I fix the issue?\n\n1. To fix the issue please install the latest version of .NET. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.\n2. If your application references the vulnerable nuget package, update the package reference to the patched version. You can list the versions you have installed by running the `dotnet --info` command.\n\nOnce you have installed the updated runtime or SDK, restart your apps for the update to take effect.\n\nAdditionally, if you\u0027ve deployed [self-contained applications](https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd) targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.\n\n## Other Information\n\n### Reporting Security Issues\n\nIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new). Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an-issue).\n\nSecurity reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.\n\n### Support\n\nYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.\n\n### Disclaimer\n\nThe information provided in this advisory is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.\n\n### External Links\n\n[CVE-2026-47303]( https://www.cve.org/CVERecord?id=CVE-2026-47303)\n\n### Acknowledgements\n\nPham Quang Minh\n\n### Revisions\n\nV1.0 (July 14, 2026): Advisory published.",
  "id": "GHSA-2p3q-h3hg-jcqq",
  "modified": "2026-07-21T16:07:53Z",
  "published": "2026-07-21T16:07:53Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/aspnetcore/security/advisories/GHSA-2p3q-h3hg-jcqq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47303"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/announcements/issues/411"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dotnet/aspnetcore"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/aspnetcore/discussions/67786"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47303"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Microsoft Security Advisory CVE-2026-47303 \u2013 .NET Elevation of Privilege Vulnerability"
}

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    "cwe_ids": [
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-11-12T18:15:46Z",
    "severity": "HIGH"
  },
  "details": "Authentication bypass by assumed-immutable data on airlift.microsoft.com allows an authorized attacker to elevate privileges over a network.",
  "id": "GHSA-3g36-jm7h-4mqf",
  "modified": "2024-11-12T18:30:59Z",
  "published": "2024-11-12T18:30:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49056"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-49056"
    }
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  "schema_version": "1.4.0",
  "severity": [
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      "type": "CVSS_V3"
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}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/kcp-dev/kcp"
      },
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          "events": [
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              "introduced": "0.30.0"
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    "CVE-2026-39429"
  ],
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    "cwe_ids": [
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      "CWE-306",
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-08T15:04:22Z",
    "nvd_published_at": "2026-04-08T21:16:59Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nThe cache server is directly exposed by the root shard and has no authentication or authorization in place.\nThis allows anyone who can access the root shard to read and write to the cache server.\n\n### Details\n\nThe cache server is routed in the pre-mux chain in the shard code. \nThe preHandlerChainMux is handled before any authn/authz in the cache server: \nhttps://github.com/kcp-dev/kcp/blob/aaf93d59cbcd0cefb70d94bd8959ce390547c4a2/pkg/server/config.go#L514-L518\n\nThis results in the cache server being proxied before any authn/authz in the handler chain takes place.\n\n### Attack Vectors\n\n#### 1. Unauthenticated Read Access (Primary)\nAn attacker can read all replicated resources from the cache without any credentials. This exposes:\n\n| Category | Resources | Severity | Reason |\n|---|---|---|---|\n| RBAC | clusterroles, clusterrolebindings (filtered by annotation) | High | Only subset with `internal.kcp.io/replicate` annotation: access rules, APIExport bind/content rules, WorkspaceType use rules. Reveals permission structure for API access and tenancy. Roles/RoleBindings NOT replicated. |\n| Infrastructure | logicalclusters, shards | High | Reveals full cluster topology and shard configuration |\n| API surface | apiexports, apiexportendpointslices, apiresourceschemas | High | Reveals all exported APIs and their network endpoints |\n| Admission control | mutatingwebhookconfigurations, validatingwebhookconfigurations, validatingadmissionpolicies | High | Reveals admission policies, aids bypass |\n| Tenancy | workspacetypes | Medium | Reveals workspace structure |\n| Cache metadata | cachedobjects, cachedresources, cachedresourceendpointslices | Medium | Exposes cache state and resource endpoints |\n\n#### 2. Write Access with Race Condition (Secondary)\nThe cache server allows full CRUD operations. While injected objects are cleaned up by the replication controller, a race condition exists that could allow temporary privilege escalation.\n\n#### The race window:\n\n1. Attacker POSTs a malicious ClusterRole + ClusterRoleBinding to the cache server\n2. Cache etcd watch fires and notifies two consumers in parallel:\n2.1. The authorization informer (CacheKubeSharedInformerFactory) updates its in-memory store \u2014 the GlobalAuthorizer and WorkspaceContentAuthorizer now see the injected RBAC rules\n2.2. The replication controller\u0027s informer enqueues a reconcile to its workqueue\n3. Replication controller worker dequeues, calls getLocalCopy() \u2192 not found, deletes the object\n\nBetween steps 2 and 3, any API request hitting the GlobalAuthorizer ([global_authorizer.go:89-101](https://github.com/kcp-dev/kcp/blob/aaf93d59c/pkg/authorization/global_authorizer.go#L89-L101)) would evaluate RBAC against a store that includes the attacker\u0027s injected rules. The authorization informer and the replication controller share the same CacheKubeSharedInformerFactory ([config.go:361](https://github.com/kcp-dev/kcp/blob/aaf93d59c/pkg/server/config.go#L361)), so the object is visible to authorization as soon as the informer cache updates \u2014 before the replication controller can process and delete it.\n\n**Practical exploitability is low** \u2014 the window is sub-second, requiring the attacker to fire the privileged API request with precise timing. However, it could be automated in a tight loop. The workqueue rate limiter could also widen the window under load.\n\n**Self-healing mechanism:** The replication controller acts as a self-healing mechanism. Objects injected into the cache are deleted almost instantly because:\n\nCreating an object in cache triggers the cache informer\nReplication controller reconciles, calls getLocalCopy() \u2192 not found\nController calls deleteObject() on the cache copy ([replication_reconcile.go:157-168](https://github.com/kcp-dev/kcp/blob/aaf93d59c/pkg/reconciler/cache/replication/replication_reconcile.go#L157-L168))\n\n### Replicatable \n\nStart a kcp root shard and query the cache server, e.g. with:\n\n```sh\ncurl --insecure \u0027https://root.vespucci.genericcontrolplane.io:6443/services/cache/shards/root/clusters/root/apis/apis.kcp.io/v1alpha1\u0027\n```\n\n### Workarounds\n\nNetwork-level access control: Restrict access to /services/cache/* paths at the load balancer, reverse proxy, or firewall level.\nExternal cache server: Deploy the cache server separately with its own kubeconfig (--cache-server-kubeconfig) and restrict network access to it.\n\n### Impact\n\nWho is affected: Any kcp deployment where the root shard is network-reachable by untrusted clients. This applies when:\n\n- **Helm chart deployments:** Affected if the shard\u0027s Service or Ingress exposes port 6443 externally.\n- **Operator deployments:** Affected if the Shard resource has spec.externalURL set (or spec.baseURL \u2014 externalURL defaults to baseURL if unset). When a shard has an external URL, clients route to it directly, exposing the /services/cache/* path.\n- **Any deployment method:** If the root shard\u0027s --shard-external-url is set and reachable from untrusted networks, the cache server is exposed.\n\n**Not affected:** Deployments where the root shard is behind a front-proxy and is not directly reachable. The front-proxy does not forward /services/cache/* requests.\n\n**Write persistence:** The replication controller watches the cache informer and acts as a self-healing mechanism. Objects injected into the cache are deleted almost instantly (sub-second) because:\n\n- Creating an object in cache triggers the cache informer\n- Replication controller reconciles, calls getLocalCopy() \u2192 not found\n- Controller calls deleteObject() on the cache copy ([replication_reconcile.go:157-168](https://github.com/kcp-dev/kcp/blob/aaf93d59c/pkg/reconciler/cache/replication/replication_reconcile.go#L157-L168))",
  "id": "GHSA-3j3q-wp9x-585p",
  "modified": "2026-04-09T14:28:52Z",
  "published": "2026-04-08T15:04:22Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kcp-dev/kcp/security/advisories/GHSA-3j3q-wp9x-585p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39429"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/kcp-dev/kcp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kcp-dev/kcp/releases/tag/v0.29.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kcp-dev/kcp/releases/tag/v0.30.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "kcp\u0027s cache server is accessible without authentication or authorization checks"
}

{
  "affected": [],
  "aliases": [
    "CVE-2024-22179"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-302"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-18T22:15:09Z",
    "severity": "HIGH"
  },
  "details": "\nThe application is vulnerable to an unauthenticated parameter \nmanipulation that allows an attacker to set the credentials to blank \ngiving her access to the admin panel. Also vulnerable to account \ntakeover and arbitrary password change.\n\n",
  "id": "GHSA-3v49-294p-4c7w",
  "modified": "2024-04-19T00:30:54Z",
  "published": "2024-04-19T00:30:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-22179"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-24-107-02"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.7.54"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "typo3/cms-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0"
            },
            {
              "fixed": "8.7.55"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 9.5.43"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "typo3/cms-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.0.0"
            },
            {
              "fixed": "9.5.44"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 10.4.40"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "typo3/cms-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.0.0"
            },
            {
              "fixed": "10.4.41"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 11.5.32"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "typo3/cms-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0"
            },
            {
              "fixed": "11.5.33"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 12.4.7"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "typo3/cms-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "12.0.0"
            },
            {
              "fixed": "12.4.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-47127"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287",
      "CWE-302"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-11-14T18:30:21Z",
    "nvd_published_at": "2023-11-14T20:15:08Z",
    "severity": "MODERATE"
  },
  "details": "\u003e ### CVSS: `CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N/E:X/RL:O/RC:C` (4.0)\n\n### Problem\nGiven that there are at least two different sites in the same TYPO3 installation - for instance _first.example.org_ and _second.example.com_ - then a session cookie generated for the first site can be reused on the second site without requiring additional authentication.\n\nThis vulnerability primarily affects the frontend of the website. It\u0027s important to note that exploiting this vulnerability requires a valid user account.\n\n### Solution\nUpdate to TYPO3 versions 8.7.55 ELTS, 9.5.44 ELTS, 10.4.41 ELTS, 11.5.33, 12.4.8 that fix the problem described above.\n\n### Credits\nThanks to R\u00e9my Daniel who reported this issue, and to TYPO3 core \u0026 security team member Benjamin Franzke who fixed the issue.\n\n### References\n* [TYPO3-CORE-SA-2023-006](https://typo3.org/security/advisory/typo3-core-sa-2023-006)\n",
  "id": "GHSA-3vmm-7h4j-69rm",
  "modified": "2023-12-15T22:14:29Z",
  "published": "2023-11-14T18:30:21Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/TYPO3/typo3/security/advisories/GHSA-3vmm-7h4j-69rm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-47127"
    },
    {
      "type": "WEB",
      "url": "https://github.com/TYPO3/typo3/commit/535dfbdc54fd5362e0bc08d911db44eac7f64019"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2023-47127.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/TYPO3/typo3"
    },
    {
      "type": "WEB",
      "url": "https://typo3.org/security/advisory/typo3-core-sa-2023-006"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "TYPO3 vulnerable to Weak Authentication in Session Handling"
}

{
  "affected": [],
  "aliases": [
    "CVE-2025-46647"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-302"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-02T12:15:28Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability of plugin\u00a0openid-connect in Apache APISIX.\n\nThis vulnerability will only have an impact if all of the following conditions are met:\n1. Use the openid-connect plugin with introspection mode\n2. The auth service connected to openid-connect provides services to multiple issuers\n3. Multiple issuers share the same private key and relies only on the issuer being different\n\nIf affected by this vulnerability, it would allow an attacker with a valid account on one of the issuers to log into the other issuer.\n\n\n\n\nThis issue affects Apache APISIX: until 3.12.0.\n\nUsers are recommended to upgrade to version 3.12.0 or higher.",
  "id": "GHSA-495r-5j65-5hp3",
  "modified": "2025-11-05T00:31:18Z",
  "published": "2025-07-02T12:32:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-46647"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/yrpp2cd3o4qkxlrh421mq8gsrt0k4x0w"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2025/07/02/1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

{
  "affected": [],
  "aliases": [
    "CVE-2025-26522"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-302"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-14T12:15:29Z",
    "severity": "HIGH"
  },
  "details": "This vulnerability exists in RupeeWeb trading platform due to improper implementation of OTP validation mechanism in certain API endpoints. A remote attacker with valid credentials could exploit this vulnerability by manipulating API responses.  \n\nSuccessful exploitation of this vulnerability could allow the attacker to bypass Two-Factor Authentication (2FA) for other user accounts.",
  "id": "GHSA-67gx-c76c-v7wc",
  "modified": "2025-02-14T12:31:38Z",
  "published": "2025-02-14T12:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-26522"
    },
    {
      "type": "WEB",
      "url": "https://www.cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01\u0026VLCODE=CIVN-2025-0020"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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"
    }
  ]
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/zitadel/zitadel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.11.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/zitadel/zitadel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.4.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/zitadel/zitadel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.31.0"
            },
            {
              "last_affected": "2.71.19"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/zitadel/zitadel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.80.0-v2.20.0.20260216092519-feab8e1fa371"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-27840"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-302"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-27T21:22:00Z",
    "nvd_published_at": "2026-02-26T01:16:25Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nOpaque OIDC access tokens in v2 format, truncated to 80 characters are still considered valid. \n\nZITADEL uses a symmetric AES encryption for opaque tokens. The cleartext payload is a concatenation of a couple of identifiers, such as a token ID and user ID. Internally Zitadel has 2 different versions of token payloads. v1 tokens are no longer created, but are still verified as to not invalidate existing session after upgrade.\n\nThe cleartext payload has a format of `\u003ctoken_id\u003e:\u003cuser_id\u003e`. v2 tokens distinguished further where the `token_id` is of the format `v2_\u003coidc_session_id\u003e-at_\u003caccess_token_id\u003e`. This is an example of such a cleartext: `V2_354201447279099906-at_354201447279165442:354201364702363650`\n\n### Impact\n\nV1 token authZ/N session data is retrieved from the database using the (simple) `token_id` value and `user_id` value. The `user_id` (called `subject` in some parts of our code) was used as being the trusted user ID.\n\nV2 token authZ/N session data is retrieved from the database using the `oidc_session_id` and `access_token_id` and in this case the `user_id` from the token is ignored and taken from the session data in the database.\n\nBy truncating the token to 80 chars, the user_id is now missing from the cleartext of the v2 token: `V2_354201447279099906-at_354201447279165442:`  The back-end still accepts this for above reasons.\n\nThis issue is not considered exploitable, but may look awkward when reproduced.\n\n### Affected Versions\n\nAll versions within the following ranges, including release candidates (RCs), are affected:\n- **v4.x**: `4.0.0` through `4.10.1`\n- **3.x**: `3.0.0` through `3.4.6`\n- **2.x**: `2.31.0` through `2.71.19`\n\n### Patches\n\nThe vulnerability has been addressed in the latest releases. The patch resolves the issue by verifying the `user_id` from the token against the session data from the database\n\n4.x: Upgrade to \u003e=[4.11.0](https://github.com/zitadel/zitadel/releases/tag/v4.11.0)\n3.x: Update to \u003e=[3.4.7](https://github.com/zitadel/zitadel/releases/tag/v3.4.7)\n2.x: Update to \u003e=[3.4.7](https://github.com/zitadel/zitadel/releases/tag/v3.4.7)\n\n### Workarounds\n\nThe recommended solution is to update ZITADEL to a patched version.\n\n### Questions\n\nIf there any questions or comments about this advisory, please send an email to [security@zitadel.com](mailto:security@zitadel.com)\n\n### Credits\n\nZITADEL thanks Olivier Becker and Lucas Dodgson for reporting this vulnerability.",
  "id": "GHSA-6mq3-xmgp-pjm5",
  "modified": "2026-02-27T21:22:00Z",
  "published": "2026-02-27T21:22:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/zitadel/zitadel/security/advisories/GHSA-6mq3-xmgp-pjm5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27840"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zitadel/zitadel/commit/feab8e1fa371f3ad654640fc869b2c14f2fdb602"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/zitadel/zitadel"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zitadel/zitadel/releases/tag/v2.71.19"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zitadel/zitadel/releases/tag/v3.4.7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zitadel/zitadel/releases/tag/v4.11.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ZITADEL\u0027s truncated opaque tokens are still valid"
}