CVE-2026-27737

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 82% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

May 18, 2026

Last Modified

July 24, 2026

Advisory Details (5)

Auto-updated Jun 13, 2026
Patch available. Sources: github_release, github, github_commit.
github_release Patch Available

v1.7.0

Patch available: blindsidenetworks/scalelite v1.7.0

https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0
github Patch Available

Stored XSS in bbb-playback replay · Advisory · bigbluebutton/bigbluebutton · GitHub

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv
github_release Patch Available

v3.0.19

Patch available: bigbluebutton/bigbluebutton v3.0.19

https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19
github_commit

commit 69f45aa1b963 (bigbluebutton/bigbluebutton)

Fix landed in bigbluebutton/bigbluebutton commit 69f45aa1b963 — awaiting tagged release

https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc
github_commit Patch Available

commit 09e89bfe4ff8 (bigbluebutton/bbb-playback)

Patch available: bigbluebutton/bbb-playback v5.4.3 (contains commit 09e89bfe4ff8)

https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 2× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 191 total refreshes for this CVE.

  1. 2026-09-20 20:15 UTCEPSS rescore
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  1. 2026-08-26 14:46 UTCEPSS rescore
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  75. 2026-07-11 08:27 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-27737?
CVE-2026-27737 is a medium vulnerability published on May 18, 2026. 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.…
When was CVE-2026-27737 disclosed?
CVE-2026-27737 was first published in the National Vulnerability Database on May 18, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27737 actively exploited?
CVE-2026-27737 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 65.6% of all scored CVEs.
What is the CVSS score of CVE-2026-27737?
CVE-2026-27737 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-27737?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27737, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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