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CVE-2026-27737

BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user's input in public chat. This allowed for a malicious actor to craft and carry out a targeted XSS attack, activated on anyone replaying the recording. This issue has been fixed 3.0.19.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8d1144153eea57605b28f91e7f843c3fac6250f0165e792910fabb43c37d7bcd
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 3 assertions

{"product":"scalite","vendor":"blindsidenetworks","versions":[{"status":"affected","version":"< 1.7.0"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/affected/1

{"product":"bigbluebutton","vendor":"bigbluebutton","versions":[{"status":"affected","version":"< 3.0.19"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/affected/0

{"product":"bbb-playback","vendor":"bigbluebutton","versions":[{"status":"affected","version":"< 5.4.3"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/affected/2

Affected products and versions

3 source assertions
{"product":"scalite","vendor":"blindsidenetworks","versions":[{"status":"affected","version":"< 1.7.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/affected/1
{"product":"bigbluebutton","vendor":"bigbluebutton","versions":[{"status":"affected","version":"< 3.0.19"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/affected/0
{"product":"bbb-playback","vendor":"bigbluebutton","versions":[{"status":"affected","version":"< 5.4.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/affected/2

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"name":"https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1","tags":["x_refsource_MISC"],"url":"https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/references/1
{"name":"https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc","tags":["x_refsource_MISC"],"url":"https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/references/2
{"name":"https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19","tags":["x_refsource_MISC"],"url":"https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/references/3
{"name":"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv","tags":["x_refsource_CONFIRM"],"url":"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/references/0
{"name":"https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0","tags":["x_refsource_MISC"],"url":"https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9d8fd900a660f3bbe5962079d63141ab7eb1a1a07117aa8aae4c5ffd2a34ac13 · sha256:57169a31dfb96d98… · /containers/cna/references/4

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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