{
  "affected": [
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.OpenApi.Kiota"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.32.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.OpenApi.Kiota.Builder"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.32.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-59863"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-829",
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-24T16:11:24Z",
    "nvd_published_at": "2026-07-16T15:16:35Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nMicrosoft Kiota honors a poisoned `.kiota/workspace.json` \u2014 the workspace configuration that Kiota\u0027s\ndocumented team workflow has developers commit to their repository \u2014 **unvalidated** on\n`kiota client generate` / `kiota plugin generate`. A repository (or pull request) containing a malicious\nper-client / per-plugin `outputPath` causes Kiota, when a developer or CI runs the documented regenerate\ncommand, to **(CWE-22) write the entire generated client to an arbitrary path outside the workspace** \u2014 the\n`outputPath` was not confined to the workspace root and absolute paths were accepted.\n\nConfirmed on Kiota **1.32.4** (`KIOTA_CONFIG_PREVIEW=true`, the self-contained `linux-x64` release binary).\n\n### Details\n\n```jsonc\n// .kiota/workspace.json (committed to the repo)\n\"clients\": { \"MyClient\": {\n   \"outputPath\": \"/abs/path/outside/repo/pwned_client\"   // -\u003e generated client written here (CWE-22)\n}}\n```\n\nRunning `kiota client generate --client-name MyClient` in the repo writes `MyClient.cs`,\n`P/PRequestBuilder.cs`, \u2026 to the attacker-chosen `outputPath` (verified outside the working tree).\n\n#### Note on `descriptionLocation`\n\nThe per-consumer `descriptionLocation` is intentionally fetched at generation time \u2014 this is how Kiota knows\nwhere to pull an updated description from when refreshing a client, the same way any other value in a\ncommitted lock/config file is honored. It is **not** treated as a vulnerability and is unchanged; only\n`outputPath` is now confined.\n\n### Impact\n\nA malicious or compromised repository \u2014 or a malicious PR that edits `.kiota/workspace.json` \u2014 leads to\narbitrary file write on the developer\u0027s or CI host\u0027s filesystem (overwrite source/build files, drop files in\nauto-loaded locations) whenever a teammate clones/pulls and runs the documented `kiota client generate` /\n`kiota plugin generate` to refresh the client. CWE-22.\n\nThis is a different trust boundary from the OpenAPI-description-based findings: the malicious input is the\nKiota **config**, not the spec.\n\n### Patches\n\nFixed in **1.32.5** (https://github.com/microsoft/kiota/pull/7885). On loading a workspace configuration,\neach client/plugin `outputPath` is validated to be a relative subdirectory of the workspace: null/empty,\nrooted paths (POSIX `/`, UNC `\\\\` / `//`, Windows drive `X:\\`), and any `..` traversal segment are rejected,\nand the resolved full path must stay under the workspace root. Generation aborts with an error if any\nconsumer\u0027s `outputPath` escapes the workspace.\n\n### Remediation\n\nUpgrade to Kiota **1.32.5** or later. Review any committed workspace configs for `outputPath` values that\npoint outside the workspace.",
  "id": "GHSA-4rj6-vrwv-wr8m",
  "modified": "2026-07-24T16:11:24Z",
  "published": "2026-07-24T16:11:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/microsoft/kiota/security/advisories/GHSA-4rj6-vrwv-wr8m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59863"
    },
    {
      "type": "WEB",
      "url": "https://github.com/microsoft/kiota/pull/7885"
    },
    {
      "type": "WEB",
      "url": "https://github.com/microsoft/kiota/commit/4049327872db7846ace35c9003774d3e3878e4e9"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/microsoft/kiota"
    },
    {
      "type": "WEB",
      "url": "https://github.com/microsoft/kiota/releases/tag/v1.32.5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Microsoft Kiota Workspace-config poisoning: out-of-repo file write + generation-time SSRF"
}