XSS in Bigbluebutton Bbb-playback
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 target…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.000 (11.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Bigbluebutton Bbb-playback — versions < 5.4.3
- Bigbluebutton — versions < 3.0.19
- Blindsidenetworks Scalite — versions < 1.7.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-27737?
- CVE-2026-27737 is a medium-severity vulnerability in Bigbluebutton Bbb-playback, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2026-05-18.
- How severe is CVE-2026-27737?
- Medium severity. CVSS v3 base score is 6.5 out of 10.