Vulnerability-Lookup

GHSA-MGM4-2355-58G4

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-10 15:33

Details

A broken object-level authorization vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unauthenticated remote attacker to read complete contract records via the getDocument Parse cloud function. The function fetches documents using useMasterKey, bypassing the object ACL, and returns full records including sender and signer PII and a pre-signed document download URL whenever the document's IsEnableOTP flag is unset, which is the default configuration.

Severity

7.5 (High)


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

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  "affected": [],
  "aliases": [
    "CVE-2026-72689"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639"
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    "nvd_published_at": "2026-08-10T13:20:39Z",
    "severity": "HIGH"
  },
  "details": "A broken object-level authorization vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unauthenticated remote attacker to read complete contract records via the getDocument Parse cloud function. The function fetches documents using useMasterKey, bypassing the object ACL, and returns full records including sender and signer PII and a pre-signed document download URL whenever the document\u0027s IsEnableOTP flag is unset, which is the default configuration.",
  "id": "GHSA-mgm4-2355-58g4",
  "modified": "2026-08-10T15:33:51Z",
  "published": "2026-08-10T15:33:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72689"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpenSignLabs/OpenSign"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
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      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72689 (GCVE-0-2026-72689)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-10 18:22

Title

OpenSignLabs opensignserver - Broken Object Level Authorization

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-10 15:48 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

TuranSec redhat root

References

1 reference

URL	Tags
https://github.com/OpenSignLabs/OpenSign	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
OpenSignLabs	opensignserver	Affected: 0 , ≤ 2.37.0 (semver)

Date Public

2026-08-10 12:00

Credits

Bobur Abdugafforov (Mahadsec)

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Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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.
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GHSA-MGM4-2355-58G4

CVE-2026-72689 (GCVE-0-2026-72689)

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