Vulnerability-Lookup

CVE-2026-46351 (GCVE-0-2026-46351)

Vulnerability from cvelistv5 – Published: 2026-07-16 17:58 – Updated: 2026-07-17 13:59

Title

BigBlueButton: Insecure Randomness allows to guess user's conference session token and impersonate them

Summary

BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web generated conference sessionToken values with insufficiently secure randomness in bbb-common-web/src/main/java/org/bigbluebutton/api/Util.java and bigbluebutton-web/grails-app/controllers/org/bigbluebutton/web/controllers/ApiController.groovy, allowing a session user to predict other users' conference session tokens and impersonate them. This issue is fixed in version 3.0.21.

Severity

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 2026-07-17 13:59 UTC

CWE

CWE-330 - Use of Insufficiently Random Values

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/bigbluebutton/bigbluebutton/se…	x_refsource_CONFIRM
https://github.com/bigbluebutton/bigbluebutton/co…	x_refsource_MISC
https://github.com/bigbluebutton/bigbluebutton/re…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bigbluebutton	bigbluebutton	Affected: < 3.0.21

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-46351

Vulnerability from fkie_nvd - Published: 2026-07-16 19:16 - Updated: 2026-07-17 18:36

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
	security-advisories@github.com	https://github.com/bigbluebutton/bigbluebutton/commit/8457886c248aeba5597ee8749267602d6d117e98
	security-advisories@github.com	https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.21
	security-advisories@github.com	https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-7959-pf2v-xc4h

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "bigbluebutton",
          "vendor": "bigbluebutton",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.0.21"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web generated conference sessionToken values with insufficiently secure randomness in bbb-common-web/src/main/java/org/bigbluebutton/api/Util.java and bigbluebutton-web/grails-app/controllers/org/bigbluebutton/web/controllers/ApiController.groovy, allowing a session user to predict other users\u0027 conference session tokens and impersonate them. This issue is fixed in version 3.0.21."
    }
  ],
  "id": "CVE-2026-46351",
  "lastModified": "2026-07-17T18:36:41.143",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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            }
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          "role": "CISA Coordinator",
          "timestamp": "2026-07-17T13:59:01.121165Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-16T19:16:45.863",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bigbluebutton/bigbluebutton/commit/8457886c248aeba5597ee8749267602d6d117e98"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.21"
    },
    {
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      "url": "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-7959-pf2v-xc4h"
    }
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
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          "value": "CWE-330"
        }
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      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

WID-SEC-W-2026-1568

Vulnerability from csaf_certbund - Published: 2026-05-17 22:00 - Updated: 2026-05-17 22:00

Summary

BigBlueButton: Mehrere Schwachstellen

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: BigBlueButton ist ein Open-Source-Web-Konferenzsystem.

Angriff: Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in BigBlueButton ausnutzen, um Sicherheitsvorkehrungen zu umgehen und vertrauliche Informationen offenzulegen.

Betroffene Betriebssysteme: - Sonstiges - UNIX

CVE-2026-46351

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source BigBlueButton <3.0.21 Open Source / BigBlueButton		<3.0.21

CVE-2026-46353

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source BigBlueButton <3.0.21 Open Source / BigBlueButton		<3.0.21

CVE-2026-46404

Affected products

Known affected 2 products

Product	Identifier	Version	Remediation
Open Source BigBlueButton <3.0.23 Open Source / BigBlueButton		<3.0.23
Open Source BigBlueButton <3.0.21 Open Source / BigBlueButton		<3.0.21

References

5 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/bigbluebutton/bigbluebutton/se…	external
https://github.com/bigbluebutton/bigbluebutton/se…	external
https://github.com/bigbluebutton/bigbluebutton/se…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "BigBlueButton ist ein Open-Source-Web-Konferenzsystem.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in BigBlueButton ausnutzen, um Sicherheitsvorkehrungen zu umgehen und vertrauliche Informationen offenzulegen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Sonstiges\n- UNIX",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1568 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1568.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1568 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1568"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-43hc-5g2m-cqff vom 2026-05-17",
        "url": "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-43hc-5g2m-cqff"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-7959-pf2v-xc4h vom 2026-05-17",
        "url": "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-7959-pf2v-xc4h"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-xqm3-6q7q-4v5h vom 2026-05-17",
        "url": "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-xqm3-6q7q-4v5h"
      }
    ],
    "source_lang": "en-US",
    "title": "BigBlueButton: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-05-17T22:00:00.000+00:00",
      "generator": {
        "date": "2026-05-18T10:56:50.346+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2026-1568",
      "initial_release_date": "2026-05-17T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-05-17T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c3.0.21",
                "product": {
                  "name": "Open Source BigBlueButton \u003c3.0.21",
                  "product_id": "T054252"
                }
              },
              {
                "category": "product_version",
                "name": "3.0.21",
                "product": {
                  "name": "Open Source BigBlueButton 3.0.21",
                  "product_id": "T054252-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:bigbluebutton:bigbluebutton:3.0.21"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c3.0.23",
                "product": {
                  "name": "Open Source BigBlueButton \u003c3.0.23",
                  "product_id": "T054253"
                }
              },
              {
                "category": "product_version",
                "name": "3.0.23",
                "product": {
                  "name": "Open Source BigBlueButton 3.0.23",
                  "product_id": "T054253-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:bigbluebutton:bigbluebutton:3.0.23"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "BigBlueButton"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      }
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  },
  "vulnerabilities": [
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      "cve": "CVE-2026-46351",
      "product_status": {
        "known_affected": [
          "T054252"
        ]
      },
      "release_date": "2026-05-17T22:00:00.000+00:00",
      "title": "CVE-2026-46351"
    },
    {
      "cve": "CVE-2026-46353",
      "product_status": {
        "known_affected": [
          "T054252"
        ]
      },
      "release_date": "2026-05-17T22:00:00.000+00:00",
      "title": "CVE-2026-46353"
    },
    {
      "cve": "CVE-2026-46404",
      "product_status": {
        "known_affected": [
          "T054253",
          "T054252"
        ]
      },
      "release_date": "2026-05-17T22:00:00.000+00:00",
      "title": "CVE-2026-46404"
    }
  ]
}

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-2026-46351 (GCVE-0-2026-46351)

FKIE_CVE-2026-46351

WID-SEC-W-2026-1568

Tags

Sightings

Nomenclature