luci-app-advanced-reboot read ACL exposes /bin/sh through file.exec, allowing delegated users to run commands as root

{
  "id": "3e07e2ad4ab7dbb0c292c2403ce9dee77488fc15053c2f4a62446b2ab7efffcd",
  "url": "https://osv.dev/vulnerability/CVE-2026-55897",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "luci-app-advanced-reboot read ACL exposes /bin/sh through file.exec, allowing delegated users to run commands as root",
    "summary": "luci-app-advanced-reboot is a LuCI (web interface) application for OpenWrt that provides a way to reboot your router into an alternative firmware partition or perform reboot operations directly from the web UI. Prior to 1.1.2-6, the luci-app-advanced-reboot read ACL in applications/luci-app-advanced-reboot/root/usr/share/rpcd/acl.d/luci-app-advanced-reboot.json grants rpcd file.exec permission for the general shell interpreter /bin/sh. An authenticated delegated session with that read ACL can supply caller-controlled params; rpcd authorizes the executable path and passes those arguments to the shell, allowing arbitrary commands to execute as root. Builds without the /bin/sh exec grant, including the checked openwrt-24.10 and openwrt-23.05 branches, are not affected by this specific chain. This vulnerability is fixed in 1.1.2-6.",
    "evidence": "osv:CVE-2026-55897",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-55897",
      "aliases": [
        "CVE-2026-55897",
        "GHSA-vj96-f37g-37f6"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openwrt/luci",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2df00deb122093cbf429266ffef7ad06aaecb48f"
                },
                {
                  "fixed": "f85102548ee8325bfd581a0327b210b5f7670829"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "2df00deb122093cbf429266ffef7ad06aaecb48f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f85102548ee8325bfd581a0327b210b5f7670829"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55897.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:34.873113871Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55897.json",
        "https://github.com/openwrt/luci/security/advisories/GHSA-vj96-f37g-37f6",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-55897",
        "https://github.com/openwrt/luci/commit/2df00deb122093cbf429266ffef7ad06aaecb48f",
        "https://github.com/openwrt/luci/commit/f85102548ee8325bfd581a0327b210b5f7670829",
        "https://github.com/openwrt/luci/pull/8710"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-78"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "1.1.2-6"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "1.1.2-6"
                  },
                  {
                    "fixed": "1.1.2-6"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55897.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-55897",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501946,
  "published_at": "2026-09-21T19:29:37.003+00:00"
}