Vulnerability-Lookup

CVE-2026-75106 (GCVE-0-2026-75106)

Vulnerability from cvelistv5 – Published: 2026-08-17 20:36 – Updated: 2026-08-18 14:15

Title

OpnForm Editable Submission Secret Derivation via Empty Hashids Salt

Summary

OpnForm derives editable-submission secrets from sequential row identifiers using Hashids with an empty default salt, allowing unauthenticated attackers to compute hashes for any submission. Attackers can read other respondents' full submission data through the submission-fetch endpoint or overwrite submissions by supplying predicted hashes to the answer endpoint.

Severity

9.3 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

9.1 (Critical)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 14:14 UTC

CWE

CWE-340 - Generation of Predictable Numbers or Identifiers

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://github.com/OpnForm/OpnForm/issues/1259	issue-tracking
https://github.com/OpnForm/OpnForm	product
https://github.com/OpnForm/OpnForm/commit/6c67ff0…	patch
https://github.com/OpnForm/OpnForm/releases/tag/v2.0.2	release-notes
https://www.vulncheck.com/advisories/opnform-edit…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
OpnForm	OpnForm	Affected: 0 , < 2.0.2 (semver)	guessed

Date Public

2026-08-16 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-75106

Vulnerability from fkie_nvd - Published: 2026-08-17 21:16 - Updated: 2026-08-18 15:17

Severity

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

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/OpnForm/OpnForm
	disclosure@vulncheck.com	https://github.com/OpnForm/OpnForm/commit/6c67ff0a9bc0ac27ae26b32b8e108a176f8161b1
	disclosure@vulncheck.com	https://github.com/OpnForm/OpnForm/issues/1259
	disclosure@vulncheck.com	https://github.com/OpnForm/OpnForm/releases/tag/v2.0.2
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/opnform-editable-submission-secret-derivation-via-empty-hashids-salt
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/OpnForm/OpnForm/issues/1259

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "defaultStatus": "unaffected",
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  ],
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  "lastModified": "2026-08-18T15:17:13.087",
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      "url": "https://github.com/OpnForm/OpnForm"
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}

GHSA-3J74-GJWG-45JM

Vulnerability from github – Published: 2026-08-17 21:31 – Updated: 2026-08-17 21:31

Details

Severity

9.1 (Critical)


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

9.3 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-75106"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-340"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-17T21:16:49Z",
    "severity": "CRITICAL"
  },
  "details": "OpnForm derives editable-submission secrets from sequential row identifiers using Hashids with an empty default salt, allowing unauthenticated attackers to compute hashes for any submission. Attackers can read other respondents\u0027 full submission data through the submission-fetch endpoint or overwrite submissions by supplying predicted hashes to the answer endpoint.",
  "id": "GHSA-3j74-gjwg-45jm",
  "modified": "2026-08-17T21:31:26Z",
  "published": "2026-08-17T21:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75106"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpnForm/OpnForm/issues/1259"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpnForm/OpnForm/commit/6c67ff0a9bc0ac27ae26b32b8e108a176f8161b1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpnForm/OpnForm"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpnForm/OpnForm/releases/tag/v2.0.2"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/opnform-editable-submission-secret-derivation-via-empty-hashids-salt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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.

Action not permitted

CVE-2026-75106 (GCVE-0-2026-75106)

FKIE_CVE-2026-75106

GHSA-3J74-GJWG-45JM

Tags

Sightings

Nomenclature