CVE-2026-46355

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Source
https://cve.org/CVERecord?id=CVE-2026-46355
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46355.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-46355
Aliases
  • GHSA-38fw-2gq7-ccgr
Published
2026-08-20T21:34:40Z
Modified
2026-10-28T02:30:52Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N CVSS Calculator
Summary
BigBlueButton: Unauthenticated Session Hijack via Exposed /bigbluebutton/api/handleJoinExistingUser
Details

BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, BigBlueButton exposed /bigbluebutton/api/handleJoinExistingUser through bigbluebutton-web/grails-app/controllers/org/bigbluebutton/web/controllers/ApiController.groovy. A requester able to supply an existingUserID for an active participant could reuse that participant's session and impersonate the participant in the same meeting because handleJoinExistingUser was a routable controller action rather than a private helper. This issue is fixed in version 3.0.23.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-287"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46355.json"
}
References

Affected packages

Git / github.com/bigbluebutton/bigbluebutton

Affected ranges

Type
GIT
Repo
https://github.com/bigbluebutton/bigbluebutton
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d32178587c1e623be2b87992b109af4a86c7a95e
Fixed
972b04e474e195cbd708b5b3f0485fe528a1a85b
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "3.0.23"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "972b04e474e195cbd708b5b3f0485fe528a1a85b"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v3.0.23",
            "range":  [
                {
                    "fixed":  "d32178587c1e623be2b87992b109af4a86c7a95e"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

2.*
2.2-beta-10
2.2-beta-11
2.2-beta-12
2.2-beta-14
2.2-beta-15
2.2-beta-16
2.2-beta-17
2.2-beta-18
2.2-beta-19
2.2-beta-2
2.2-beta-20
2.2-beta-21
2.2-beta-22
2.2-beta-23
2.2-beta-3
2.2-beta-4
2.2-beta-5
2.2-beta-6
2.2-beta-7
2.2-beta-8
2.2-beta-9
2.2-rc-1
2.2-rc-2
2.2-rc-3
3.*
3.0.0-rc.1
Other
dcs-2-a
v0.*
v0.8
v0.8b4
v0.8b4.0
v0.8rc2
v0.9.0-beta
v2.*
v2.3-alpha-1
v2.3-alpha-2
v2.3-alpha-3
v2.3-alpha-4
v2.3-alpha-5
v2.3-alpha-6
v2.3-alpha-7
v2.3-alpha-8
v2.3-beta-1
v2.3-beta-2
v2.3-beta-3
v2.3-beta-4
v2.3-beta-5
v2.3-rc-1
v2.3-rc-2
v2.3.0
v2.3.1
v2.4-alpha-1
v2.4-beta-1
v2.4-beta-2
v2.4-beta-3
v2.4-beta-4
v3.*
v3.0.0
v3.0.0-alpha.1
v3.0.0-alpha.2
v3.0.0-alpha.3
v3.0.0-alpha.4
v3.0.0-alpha.6
v3.0.0-alpha.7
v3.0.0-beta.1
v3.0.0-beta.2
v3.0.0-beta.3
v3.0.0-beta.4
v3.0.0-beta.5
v3.0.0-beta.6
v3.0.0-beta.7
v3.0.0-rc.1
v3.0.0-rc.2
v3.0.0-rc.3
v3.0.0-rc.4
v3.0.1
v3.0.10
v3.0.11
v3.0.12
v3.0.13
v3.0.14
v3.0.15
v3.0.16
v3.0.17
v3.0.18
v3.0.19
v3.0.2
v3.0.20
v3.0.21
v3.0.22
v3.0.3
v3.0.4
v3.0.5
v3.0.7
v3.0.8
v3.0.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46355.json"