CVE Explorer

CVE-2026-27736

BigBlueButton is an open-source virtual classroom. In versions on the 3.x branch prior to 3.0.20, the string received with errorRedirectUrl lacks validation, using it directly in the respondWithRedirect function leads to an Open Redirect vulnerability. BigBlueButton 3.0.20 patches the issue. No known workarounds are available.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4b8cf22310b5384343f5eb83bf48bae1dcfc73486584dc5bbfd09905cfaf8f8b

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"bigbluebutton","vendor":"bigbluebutton","versions":[{"status":"affected","version":">= 3.0.0, < 3.0.20"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:e9a681c8454a92c74687bf62b2555ec551846d89c44ae75688d15c095241a561 · sha256:4141245bc8bcc493… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:e9a681c8454a92c74687bf62b2555ec551846d89c44ae75688d15c095241a561 · sha256:4141245bc8bcc493… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-601","description":"CWE-601: URL Redirection to Untrusted Site ('Open Redirect')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:e9a681c8454a92c74687bf62b2555ec551846d89c44ae75688d15c095241a561 · sha256:4141245bc8bcc493… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/bigbluebutton/bigbluebutton/commit/691f92f3af0d6b796b91cb968977068663119812","tags":["x_refsource_MISC"],"url":"https://github.com/bigbluebutton/bigbluebutton/commit/691f92f3af0d6b796b91cb968977068663119812"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:e9a681c8454a92c74687bf62b2555ec551846d89c44ae75688d15c095241a561 · sha256:4141245bc8bcc493… · /containers/cna/references/1

{"name":"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-65cv-rg9f-qqrx","tags":["x_refsource_CONFIRM"],"url":"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-65cv-rg9f-qqrx"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:e9a681c8454a92c74687bf62b2555ec551846d89c44ae75688d15c095241a561 · sha256:4141245bc8bcc493… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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