CVE-2026-27737

mediumpriority · track · 0EPSS 0.003 · 17 %ileDEEU

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.26% (17th) EPSS

CVSS 6.5 · medium

Is it mine?

7 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · cert_bund

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nsecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nsecondary · security-advisories@github.comexploitability 2.8 · impact 3.6

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79US

affected products (7)

Products and version ranges known to be affected.

Open Source BigBlueButton <3.0.19all versionscert_bundDE
Open Source BigBlueButton Scalelite <1.7.0all versionscert_bundDE
Open Source BigBlueButton≤ Scalelite <1.7.0cert_bundDE
Open Source BigBlueButton< 3.0.19cert_bundDE
bbb-playback≤ < 5.4.3enisa_euvdEU
bigbluebutton≤ < 3.0.19enisa_euvdEU
scalite≤ < 1.7.0enisa_euvdEU

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1501BigBlueButton: Schwachstelle ermöglicht Cross-Site ScriptingDeutsch2026-05-12csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in BigBlueButton ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund NVD CVE.org MITRE

published 2026-05-18modified 2026-07-24

references (12)

External citations — patches, advisories, analysis.

scry

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