Vulnerability-Lookup

CVE-2026-40163 (GCVE-0-2026-40163)

Vulnerability from cvelistv5 – Published: 2026-04-10 17:07 – Updated: 2026-04-15 14:50

Title

Saltcorn has an Unauthenticated Path Traversal in sync endpoints allows arbitrary file write and directory read

Summary

Saltcorn is an extensible, open source, no-code database application builder. Prior to 1.4.5, 1.5.5, and 1.6.0-beta.4, the POST /sync/offline_changes endpoint allows an unauthenticated attacker to create arbitrary directories and write a changes.json file with attacker-controlled JSON content anywhere on the server filesystem. The GET /sync/upload_finished endpoint allows an unauthenticated attacker to list arbitrary directory contents and read specific JSON files. This vulnerability is fixed in 1.4.5, 1.5.5, and 1.6.0-beta.4.

Severity ?

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

URL

Tags

https://github.com/saltcorn/saltcorn/security/adv…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	saltcorn	saltcorn	Affected: < 1.4.5 Affected: >= 1.5.0-beta.0, < 1.5.5 Affected: >= 1.6.0-alpha.0, < 1.6.0-beta.4

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GHSA-32PV-MPQG-H292

Vulnerability from github – Published: 2026-04-10 19:30 – Updated: 2026-04-10 19:30

Summary

Saltcorn has an Unauthenticated Path Traversal in sync endpoints, allowing arbitrary file write and directory read

Details

Summary

Two unauthenticated path traversal vulnerabilities exist in Saltcorn's mobile sync endpoints. The POST /sync/offline_changes endpoint allows an unauthenticated attacker to create arbitrary directories and write a changes.json file with attacker-controlled JSON content anywhere on the server filesystem. The GET /sync/upload_finished endpoint allows an unauthenticated attacker to list arbitrary directory contents and read specific JSON files.

The safe path validation function File.normalise_in_base() exists in the codebase and is correctly used by the clean_sync_dir endpoint in the same file (fix for GHSA-43f3-h63w-p6f6), but was not applied to these two endpoints.

Details

Finding 1: Arbitrary file write — POST /sync/offline_changes (sync.js line 226)

The newSyncTimestamp parameter from the request body is used directly in path.join() without sanitization:

const syncDirName = `${newSyncTimestamp}_${req.user?.email || "public"}`;
const syncDir = path.join(
    rootFolder.location, "mobile_app", "sync", syncDirName
);
await fs.mkdir(syncDir, { recursive: true });        // creates arbitrary dir
await fs.writeFile(
    path.join(syncDir, "changes.json"),
    JSON.stringify(changes)                           // writes attacker content
);

No authentication middleware is applied to this route. Since path.join() normalizes ../ sequences, setting newSyncTimestamp to ../../../../tmp/evil causes the path to resolve outside the sync directory.

Finding 2: Arbitrary directory read — GET /sync/upload_finished (sync.js line 288)

The dir_name query parameter is used directly in path.join() without sanitization:

const syncDir = path.join(
    rootFolder.location, "mobile_app", "sync", dir_name
);
let entries = await fs.readdir(syncDir);

Also unauthenticated. An attacker can list directory contents and read files named translated-ids.json, unique-conflicts.json, data-conflicts.json, or error.json from any directory.

Contrast — fixed endpoint in the same file (line 342):

The clean_sync_dir endpoint correctly uses File.normalise_in_base():

const syncDir = File.normalise_in_base(
    path.join(rootFolder.location, "mobile_app", "sync"),
    dir_name
);
if (syncDir) await fs.rm(syncDir, { recursive: true, force: true });

PoC

# Write arbitrary file to /tmp/
curl -X POST http://TARGET:3000/sync/offline_changes \
  -H "Content-Type: application/json" \
  -d '{
    "newSyncTimestamp": "../../../../tmp/saltcorn_poc",
    "oldSyncTimestamp": "0",
    "changes": {"proof": "path_traversal_write"}
  }'
# Result: /tmp/saltcorn_poc_public/changes.json created with attacker content

# List /etc/ directory
curl "http://TARGET:3000/sync/upload_finished?dir_name=../../../../etc"

Impact

Unauthenticated arbitrary directory creation anywhere on the filesystem
Unauthenticated arbitrary JSON file write (changes.json) to any writable directory
Unauthenticated directory listing of arbitrary directories
Unauthenticated read of specific JSON files from arbitrary directories
Potential for remote code execution via writing to sensitive paths (cron, systemd, Node.js module paths)

Remediation

Apply File.normalise_in_base() to both endpoints, matching the existing pattern in clean_sync_dir:

// offline_changes fix
const syncDirName = `${newSyncTimestamp}_${req.user?.email || "public"}`;
const syncDir = File.normalise_in_base(
    path.join(rootFolder.location, "mobile_app", "sync"),
    syncDirName
);
if (!syncDir) {
    return res.status(400).json({ error: "Invalid sync directory name" });
}

// upload_finished fix
const syncDir = File.normalise_in_base(
    path.join(rootFolder.location, "mobile_app", "sync"),
    dir_name
);
if (!syncDir) {
    return res.json({ finished: false });
}

Additionally, add loggedIn middleware to endpoints that modify server state.

Severity ?

8.2 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@saltcorn/server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@saltcorn/server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.5.0-beta.0"
            },
            {
              "fixed": "1.5.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@saltcorn/server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.6.0-alpha.0"
            },
            {
              "fixed": "1.6.0-beta.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40163"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-10T19:30:27Z",
    "nvd_published_at": "2026-04-10T18:16:46Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nTwo unauthenticated path traversal vulnerabilities exist in Saltcorn\u0027s mobile sync endpoints. The `POST /sync/offline_changes` endpoint allows an unauthenticated attacker to create arbitrary directories and write a `changes.json` file with attacker-controlled JSON content anywhere on the server filesystem. The `GET /sync/upload_finished` endpoint allows an unauthenticated attacker to list arbitrary directory contents and read specific JSON files.\n\nThe safe path validation function `File.normalise_in_base()` exists in the codebase and is correctly used by the `clean_sync_dir` endpoint in the **same file** (fix for GHSA-43f3-h63w-p6f6), but was not applied to these two endpoints.\n\n### Details\n\n**Finding 1: Arbitrary file write \u2014 `POST /sync/offline_changes` (sync.js line 226)**\n\nThe `newSyncTimestamp` parameter from the request body is used directly in `path.join()` without sanitization:\n\n```javascript\nconst syncDirName = `${newSyncTimestamp}_${req.user?.email || \"public\"}`;\nconst syncDir = path.join(\n    rootFolder.location, \"mobile_app\", \"sync\", syncDirName\n);\nawait fs.mkdir(syncDir, { recursive: true });        // creates arbitrary dir\nawait fs.writeFile(\n    path.join(syncDir, \"changes.json\"),\n    JSON.stringify(changes)                           // writes attacker content\n);\n```\n\nNo authentication middleware is applied to this route. Since `path.join()` normalizes `../` sequences, setting `newSyncTimestamp` to `../../../../tmp/evil` causes the path to resolve outside the sync directory.\n\n**Finding 2: Arbitrary directory read \u2014 `GET /sync/upload_finished` (sync.js line 288)**\n\nThe `dir_name` query parameter is used directly in `path.join()` without sanitization:\n\n```javascript\nconst syncDir = path.join(\n    rootFolder.location, \"mobile_app\", \"sync\", dir_name\n);\nlet entries = await fs.readdir(syncDir);\n```\n\nAlso unauthenticated. An attacker can list directory contents and read files named `translated-ids.json`, `unique-conflicts.json`, `data-conflicts.json`, or `error.json` from any directory.\n\n**Contrast \u2014 fixed endpoint in the same file (line 342):**\n\nThe `clean_sync_dir` endpoint correctly uses `File.normalise_in_base()`:\n\n```javascript\nconst syncDir = File.normalise_in_base(\n    path.join(rootFolder.location, \"mobile_app\", \"sync\"),\n    dir_name\n);\nif (syncDir) await fs.rm(syncDir, { recursive: true, force: true });\n```\n\n### PoC\n\n```bash\n# Write arbitrary file to /tmp/\ncurl -X POST http://TARGET:3000/sync/offline_changes \\\n  -H \"Content-Type: application/json\" \\\n  -d \u0027{\n    \"newSyncTimestamp\": \"../../../../tmp/saltcorn_poc\",\n    \"oldSyncTimestamp\": \"0\",\n    \"changes\": {\"proof\": \"path_traversal_write\"}\n  }\u0027\n# Result: /tmp/saltcorn_poc_public/changes.json created with attacker content\n\n# List /etc/ directory\ncurl \"http://TARGET:3000/sync/upload_finished?dir_name=../../../../etc\"\n```\n\n### Impact\n\n- **Unauthenticated arbitrary directory creation** anywhere on the filesystem\n- **Unauthenticated arbitrary JSON file write** (`changes.json`) to any writable directory\n- **Unauthenticated directory listing** of arbitrary directories\n- **Unauthenticated read** of specific JSON files from arbitrary directories\n- Potential for **remote code execution** via writing to sensitive paths (cron, systemd, Node.js module paths)\n\n### Remediation\n\nApply `File.normalise_in_base()` to both endpoints, matching the existing pattern in `clean_sync_dir`:\n\n```javascript\n// offline_changes fix\nconst syncDirName = `${newSyncTimestamp}_${req.user?.email || \"public\"}`;\nconst syncDir = File.normalise_in_base(\n    path.join(rootFolder.location, \"mobile_app\", \"sync\"),\n    syncDirName\n);\nif (!syncDir) {\n    return res.status(400).json({ error: \"Invalid sync directory name\" });\n}\n\n// upload_finished fix\nconst syncDir = File.normalise_in_base(\n    path.join(rootFolder.location, \"mobile_app\", \"sync\"),\n    dir_name\n);\nif (!syncDir) {\n    return res.json({ finished: false });\n}\n```\n\nAdditionally, add `loggedIn` middleware to endpoints that modify server state.",
  "id": "GHSA-32pv-mpqg-h292",
  "modified": "2026-04-10T19:30:27Z",
  "published": "2026-04-10T19:30:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/saltcorn/saltcorn/security/advisories/GHSA-32pv-mpqg-h292"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40163"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/saltcorn/saltcorn"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Saltcorn has an Unauthenticated Path Traversal in sync endpoints, allowing arbitrary file write and directory read"
}

FKIE_CVE-2026-40163

Vulnerability from fkie_nvd - Published: 2026-04-10 18:16 - Updated: 2026-04-13 15:02

Severity ?

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/saltcorn/saltcorn/security/advisories/GHSA-32pv-mpqg-h292

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Saltcorn is an extensible, open source, no-code database application builder. Prior to 1.4.5, 1.5.5, and 1.6.0-beta.4, the POST /sync/offline_changes endpoint allows an unauthenticated attacker to create arbitrary directories and write a changes.json file with attacker-controlled JSON content anywhere on the server filesystem. The GET /sync/upload_finished endpoint allows an unauthenticated attacker to list arbitrary directory contents and read specific JSON files. This vulnerability is fixed in 1.4.5, 1.5.5, and 1.6.0-beta.4."
    }
  ],
  "id": "CVE-2026-40163",
  "lastModified": "2026-04-13T15:02:06.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-10T18:16:46.233",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/saltcorn/saltcorn/security/advisories/GHSA-32pv-mpqg-h292"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-40163 (GCVE-0-2026-40163)

GHSA-32PV-MPQG-H292

Summary

Details

PoC

Impact

Remediation

FKIE_CVE-2026-40163

Tags

Sightings

Nomenclature