CVE-2026-48089: Github.com/l3montree dev/devguard DevGuard Has Improper Authorization On Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6p54-fw2f-q7gf",
  "modified" : "2026-07-15T21:58:25Z",
  "published" : "2026-06-11T20:26:18Z",
  "aliases" : [ "CVE-2026-48089" ],
  "summary" : "DevGuard has improper authorization on public assets",
  "details" : "### Impact\n\nOn a DevGuard API instance with one or more **public assets**, any authenticated user — including users from a different organization with no membership or role in the affected org/project — can create, update, reapply, and delete **VEX rules** on those public assets. The same flaw affects the other vulnerability-triage write endpoints exposed under a public asset, including:\n\n- VEX rule create / update / reapply / delete\n- Dependency-vuln event creation (accept / reject / mitigate decisions), batch event creation, vuln sync, and mitigation\n- License risk creation\n- External reference writes\n- Artifact creation and license refresh\n\nThe attacker needs a valid account on the instance, but no membership in the victim organization, project, or asset is required.\n\n**Security impact** is primarily to **integrity** of the vulnerability picture of public assets: an attacker can mark CVEs as false-positive, silence vulnerabilities, attach misleading justifications, or delete legitimate triage rules — undermining the trustworthiness of every consumer of the affected asset's VEX/SBOM output. Because public assets are by definition consumed by third parties (downstream users, supply-chain consumers, the published vex.json/sbom.json), the blast radius extends to anyone relying on that data.\n\nPrivate assets are **not affected** by this advisory: the public-read exemption that enables the bypass does not apply to them, and access remains correctly gated by organization/project membership. The private setting is only relevant in DevGuard itself —  there is no impact given when you have an open-source project on e.g. GitLab/GitHub and a private DevGuard asset connected.\n\n### Patches\n\nVersion `v1.4.2`contains a patch. Users should upgrade to the patched release as soon as it is available.\n\n### Workarounds\n\nIf developers cannot upgrade their applications immediately:\n\n- ** They should make affected assets non-public.** In the asset settings, switch visibility from public to private. This removes the public-read exemption in the access-control middleware and restores correct authorization on all write endpoints for that asset. Downstream consumers that previously relied on the public `vex.json` / `sbom.json` endpoints will need to be granted explicit access or must receive an exported file version until the patched release is deployed.\n\n### Resources\nFixed commit: https://github.com/l3montree-dev/devguard/commit/1be88ec1309a5dc0566e35a23bdc4ea3ecd11417\n\n### Credit\n\nDeevGuard thanks @philipflohr ([awesome-it.de](https://awesome-it.de/)) for finding and responsibly reporting this vulnerability!",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/l3montree-dev/devguard"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/l3montree-dev/devguard/security/advisories/GHSA-6p54-fw2f-q7gf"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-48089"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/l3montree-dev/devguard/commit/1be88ec1309a5dc0566e35a23bdc4ea3ecd11417"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/l3montree-dev/devguard"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-285", "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-11T20:26:18Z",
    "nvd_published_at" : "2026-06-19T20:16:16Z"
  }
}