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Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-27736

CVE-2026-27736

MEDIUM6.1

BigBlueButton has Open Redirect vulnerability in ApiController

Published Feb 25, 2026

Modified 6 days ago

Details

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.

References

https://github.com/bigbluebutton/bigbluebutton/commit/691f92f3af0d6b796b91cb968977068663119812

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-65cv-rg9f-qqrx

https://www.cve.org/CVERecord?id=CVE-2026-27736

CVSS Analysis

CVSS v3.1

6.1

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

Scope

ChangedS:C

Impact

Confidentiality

LowC:L

Integrity

LowI:L

Availability

NoneA:N

6.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness Type (CWE)

Input Validation

Ecosystems

Timeline

PublishedFeb 25, 2026

ModifiedFeb 26, 2026

CVE-2026-27736 | Mondoo Vulnerability Intelligence