Vulnerability-Lookup

CVE-2026-86723 (GCVE-0-2026-86723)

Vulnerability from cvelistv5 – Published: 2026-09-08 15:13 – Updated: 2026-09-08 15:34

Title

AVideo LoginControl PGP Authentication Bypass via verifyChallenge

Summary

AVideo through c3edcc274c389816d434acadac07ee78eaf330c1 contains an authentication bypass vulnerability in LoginControl::verifyChallenge() that uses loose comparison (==) instead of strict comparison (===) against unset session values. Attackers with only a password can submit an empty request to verifyChallenge.json.php to bypass PGP two-factor authentication and gain full authenticated access.

Severity

8.6 (High)


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

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-08 15:34 UTC

CWE

CWE-287 - Improper Authentication

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/WWBN/AVideo/security/advisorie…	vendor-advisory
https://www.vulncheck.com/advisories/avideo-login…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
WWBN	AVideo	Affected: 0 , ≤ c3edcc274c389816d434acadac07ee78eaf330c1 (git) cpe:2.3:a:wwbn:avideo:-:::::::*

Date Public

2026-08-24 00:00

Credits

santhreal

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-86723

Vulnerability from fkie_nvd - Published: 2026-09-08 16:18 - Updated: 2026-09-08 19:53

Severity

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

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/WWBN/AVideo/security/advisories/GHSA-vmpj-f3mf-q4j2
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/avideo-logincontrol-pgp-authentication-bypass-via-verifychallenge

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "AVideo",
          "vendor": "WWBN",
          "versions": [
            {
              "lessThanOrEqual": "c3edcc274c389816d434acadac07ee78eaf330c1",
              "status": "affected",
              "version": "0",
              "versionType": "git"
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          ]
        }
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    }
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      "value": "AVideo through c3edcc274c389816d434acadac07ee78eaf330c1 contains an authentication bypass vulnerability in LoginControl::verifyChallenge() that uses loose comparison (==) instead of strict comparison (===) against unset session values. Attackers with only a password can submit an empty request to verifyChallenge.json.php to bypass PGP two-factor authentication and gain full authenticated access."
    }
  ],
  "id": "CVE-2026-86723",
  "lastModified": "2026-09-08T19:53:13.400",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
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          "attackVector": "NETWORK",
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          "integrityImpact": "HIGH",
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    "cvssMetricV40": [
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          "exploitMaturity": "NOT_DEFINED",
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          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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}

GHSA-VHPV-CV9Q-CPGJ

Vulnerability from github – Published: 2026-09-08 18:31 – Updated: 2026-09-08 18:31

Details

Severity

8.1 (High)


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

8.6 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-86723"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-08T16:18:32Z",
    "severity": "HIGH"
  },
  "details": "AVideo through c3edcc274c389816d434acadac07ee78eaf330c1 contains an authentication bypass vulnerability in LoginControl::verifyChallenge() that uses loose comparison (==) instead of strict comparison (===) against unset session values. Attackers with only a password can submit an empty request to verifyChallenge.json.php to bypass PGP two-factor authentication and gain full authenticated access.",
  "id": "GHSA-vhpv-cv9q-cpgj",
  "modified": "2026-09-08T18:31:52Z",
  "published": "2026-09-08T18:31:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-vmpj-f3mf-q4j2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86723"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/avideo-logincontrol-pgp-authentication-bypass-via-verifychallenge"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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.
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-2026-86723 (GCVE-0-2026-86723)

FKIE_CVE-2026-86723

GHSA-VHPV-CV9Q-CPGJ

Tags

Sightings

Nomenclature

Related by attack behaviour