Vulnerability-Lookup

CVE-2026-54356 (GCVE-0-2026-54356)

Vulnerability from cvelistv5 – Published: 2026-08-17 20:32 – Updated: 2026-08-18 13:33

Title

Budibase authenticated arbitrary S3 signed upload URL issuance via `/api/attachments/:datasourceId/url`

Summary

Budibase is an open-source low-code platform. Prior to 3.41.3, POST /api/attachments/:datasourceId/url in packages/server/src/api/routes/static.ts and packages/server/src/api/controllers/static/index.ts allows an authenticated published-app user with the BASIC role to supply attacker-controlled bucket and key values and obtain signedUrl and publicUrl values backed by stored S3 datasource credentials. This issue is fixed in version 3.41.3.

Severity

7.1 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 13:32 UTC

CWE

CWE-862 - Missing Authorization

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/Budibase/budibase/security/adv…	x_refsource_CONFIRM
https://github.com/Budibase/budibase/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
Budibase	budibase	Affected: < 3.41.3	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-54356

Vulnerability from fkie_nvd - Published: 2026-08-17 21:16 - Updated: 2026-09-08 21:03

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/Budibase/budibase/releases/tag/3.41.3
	security-advisories@github.com	https://github.com/Budibase/budibase/security/advisories/GHSA-6x9p-4r67-5gjx
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/Budibase/budibase/security/advisories/GHSA-6x9p-4r67-5gjx

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "budibase",
          "vendor": "Budibase",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.41.3"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
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      "lang": "en",
      "value": "Budibase is an open-source low-code platform. Prior to 3.41.3, POST /api/attachments/:datasourceId/url in packages/server/src/api/routes/static.ts and packages/server/src/api/controllers/static/index.ts allows an authenticated published-app user with the BASIC role to supply attacker-controlled bucket and key values and obtain signedUrl and publicUrl values backed by stored S3 datasource credentials. This issue is fixed in version 3.41.3."
    }
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  "lastModified": "2026-09-08T21:03:08.410",
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          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
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      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-6X9P-4R67-5GJX

Vulnerability from github – Published: 2026-08-26 14:07 – Updated: 2026-08-26 14:07

Summary

Budibase authenticated arbitrary S3 signed upload URL issuance via `/api/attachments/:datasourceId/url`

Details

Summary

Budibase 3.39.7 allows a low-privilege authenticated published-app user with the built-in BASIC role to obtain arbitrary S3 pre-signed upload URLs backed by a workspace datasource's stored server-side credentials.

The affected endpoint is:

POST /api/attachments/:datasourceId/url

The caller can control:

bucket
key

and receives:

signedUrl
publicUrl

This lets a low-privilege published-app user mint S3 PUT URLs using server-side datasource credentials for attacker-chosen object destinations.

Steps:

Log in as an admin user.
Create a new app/workspace.
In the development app context, create an S3 datasource with valid credentials.
Publish the app.
Create a low-privilege user with the built-in BASIC role on the published production app ID.
Log in as that BASIC user.
Send: POST /api/attachments/<datasourceId>/url

with:

{"bucket":"foo","key":"bar"}

and the published app header:

x-budibase-app-id: <published_app_id>

Observe a successful response containing:

signedUrl
publicUrl

Observed result

The following behavior:

dev BASIC request: 403 User does not have permission app publish: SUCCESS prod BASIC request: 200 OK Example confirmed runtime values from the final successful run:

prodAppId: app_e6b4cdc6cd6949969a83ff11eee88c5a
datasourceId: datasource_0cec491b26a742468257c62382aa3284
publicUrl: https://foo.s3.eu-west-1.amazonaws.com/bar

The returned signedUrl contained standard AWS signing markers, including:

X-Amz-Credential=bb
X-Amz-Signature
X-Amz-Expires=900

Impact

A low-privilege published-app user who knows a valid datasource ID can mint S3 upload URLs backed by server-side datasource credentials and choose arbitrary destination bucket and key values.

Route definition

packages/server/src/api/routes/static.ts:45 Authorization logic packages/server/src/middleware/authorized.ts packages/server/src/middleware/resourceId.ts Controller logic packages/server/src/api/controllers/static/index.ts Datasource lookup packages/server/src/sdk/workspace/datasources/datasources.ts

Severity

7.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@budibase/server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3.38.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54356"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-26T14:07:26Z",
    "nvd_published_at": "2026-08-17T21:16:46Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nBudibase 3.39.7 allows a low-privilege authenticated published-app user with the built-in BASIC role to obtain arbitrary S3 pre-signed upload URLs backed by a workspace datasource\u0027s stored server-side credentials.\n\nThe affected endpoint is:\n\n`POST /api/attachments/:datasourceId/url`\n\nThe caller can control:\n```text\nbucket\nkey\n```\nand receives:\n```text\nsignedUrl\npublicUrl\n```\n\nThis lets a low-privilege published-app user mint S3 `PUT` URLs using server-side datasource credentials for attacker-chosen object destinations.\n\nSteps:\n\n1. Log in as an admin user.\n2. Create a new app/workspace.\n3. In the development app context, create an S3 datasource with valid credentials.\n4. Publish the app.\n5. Create a low-privilege user with the built-in BASIC role on the published production app ID.\n6. Log in as that BASIC user.\n7. Send:\n`POST /api/attachments/\u003cdatasourceId\u003e/url`\n\nwith:\n```json\n{\"bucket\":\"foo\",\"key\":\"bar\"}\n```\nand the published app header:\n```text\nx-budibase-app-id: \u003cpublished_app_id\u003e\n```\nObserve a successful response containing:\n```text\nsignedUrl\npublicUrl\n```\n\n### Observed result\n\nThe following behavior:\n\ndev BASIC request: 403 User does not have permission\napp publish: SUCCESS\nprod BASIC request: 200 OK\nExample confirmed runtime values from the final successful run:\n```text\nprodAppId: app_e6b4cdc6cd6949969a83ff11eee88c5a\ndatasourceId: datasource_0cec491b26a742468257c62382aa3284\npublicUrl: https://foo.s3.eu-west-1.amazonaws.com/bar\n```\nThe returned signedUrl contained standard AWS signing markers, including:\n```text\nX-Amz-Credential=bb\nX-Amz-Signature\nX-Amz-Expires=900\n```\n### Impact\n\nA low-privilege published-app user who knows a valid datasource ID can mint S3 upload URLs backed by server-side datasource credentials and choose arbitrary destination bucket and key values.\n\n### Route definition\n`packages/server/src/api/routes/static.ts:45`\nAuthorization logic\n`packages/server/src/middleware/authorized.ts`\n`packages/server/src/middleware/resourceId.ts`\nController logic\n`packages/server/src/api/controllers/static/index.ts`\nDatasource lookup\n`packages/server/src/sdk/workspace/datasources/datasources.ts`",
  "id": "GHSA-6x9p-4r67-5gjx",
  "modified": "2026-08-26T14:07:26Z",
  "published": "2026-08-26T14:07:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Budibase/budibase/security/advisories/GHSA-6x9p-4r67-5gjx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54356"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Budibase/budibase"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Budibase/budibase/releases/tag/3.41.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Budibase authenticated arbitrary S3 signed upload URL issuance via `/api/attachments/:datasourceId/url`"
}

WID-SEC-W-2026-2849

Vulnerability from csaf_certbund - Published: 2026-08-13 22:00 - Updated: 2026-08-30 22:00

Summary

Budibase: Mehrere Schwachstellen

Severity

Hoch

Scope

5 vulnerabilities in this advisory, including CVE-2026-54356.

CVE-2026-54356

Known affected: 1 product

Open the full advisory

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-54356 (GCVE-0-2026-54356)

FKIE_CVE-2026-54356

GHSA-6X9P-4R67-5GJX

Summary

Observed result

Impact

Route definition

WID-SEC-W-2026-2849

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Related by attack behaviour