CVE-2026-27736

MEDIUM EPSS 4.3%
Published Feb 25, 20264mo ago · Modified Mar 5, 20263mo ago
6.1 CVSS 3.1
Medium
Find Similar
Published Feb 25, 2026 4mo ago
Last Modified Mar 5, 2026 3mo ago

Description

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.

CVSS Details

Base Score
6.1
Exploitability
2.8
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
4.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-601

Affected Products 1

VendorProductVersionRange
bigbluebuttonbigbluebutton* <3.0.20

References 2

  • github.com https://github.com/bigbluebutton/bigbluebutton/commit/691f92f3af0d6b796b91cb968977068663119812
    Patch
  • github.com https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-65cv-rg9f-qqrx
    PatchVendor Advisory

Remediation

  • github.com https://github.com/bigbluebutton/bigbluebutton/commit/691f92f3af0d6b796b91cb968977068663119812
    Patch
  • github.com https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-65cv-rg9f-qqrx
    PatchVendor Advisory