Improper access control for pencil annotations in BigBlueButton
Priority LOW 22CWE-285Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-285.
Summary
BigBlueButton is an open source web conferencing system. Starting in version 2.2 and prior to versions 2.3.18 and 2.4-rc-6, an attacker can circumvent access restrictions for drawing on the whiteboard. The permission check is inadvertently skipped on the server, due to a previously introduced grace period. The attacker must be a meeting participant. The problem has been patched in versions 2.3.18 and 2.4-rc-6. There are currently no known workarounds.
Why it matters now
EPSS 0.00886 59th percentileScored 2026-11-07
Fix Fixed bigbluebutton (bigbluebutton): 2.3.18, 2.4-rc-6
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| bigbluebutton | bigbluebutton | 2.2 to before 2.3.18; 2.4-alpha-1 to before 2.4-rc-6 | 2.3.18, 2.4-rc-6 | Patch available | CNA |
- bigbluebutton Vendorbigbluebutton Affected 2.2 to before 2.3.18; 2.4-alpha-1 to before 2.4-rc-6 Fixed in 2.3.18, 2.4-rc-6 Patch available CNA
CPE configurations NVD · 11
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:* | 2.2.0 to before 2.3.18 | Vulnerable | bigbluebutton |
| cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:alpha1:*:*:*:*:*:* | 2.4 alpha1 | Vulnerable | bigbluebutton |
| cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:alpha2:*:*:*:*:*:* | 2.4 alpha2 | Vulnerable | bigbluebutton |
| cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:beta1:*:*:*:*:*:* | 2.4 beta1 | Vulnerable | bigbluebutton |
| cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:beta2:*:*:*:*:*:* | 2.4 beta2 | Vulnerable | bigbluebutton |
| cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:beta3:*:*:*:*:*:* | 2.4 beta3 | Vulnerable | bigbluebutton |
| cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:beta4:*:*:*:*:*:* | 2.4 beta4 | Vulnerable | bigbluebutton |
| cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:rc1:*:*:*:*:*:* | 2.4 rc1 | Vulnerable | bigbluebutton |
| cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:rc3:*:*:*:*:*:* | 2.4 rc3 | Vulnerable | bigbluebutton |
| cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:rc4:*:*:*:*:*:* | 2.4 rc4 | Vulnerable | bigbluebutton |
- cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:* Versions 2.2.0 to before 2.3.18 Vulnerable ·bigbluebutton
- cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:alpha1:*:*:*:*:*:* Versions 2.4 alpha1 Vulnerable ·bigbluebutton
- cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:alpha2:*:*:*:*:*:* Versions 2.4 alpha2 Vulnerable ·bigbluebutton
- cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:beta1:*:*:*:*:*:* Versions 2.4 beta1 Vulnerable ·bigbluebutton
- cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:beta2:*:*:*:*:*:* Versions 2.4 beta2 Vulnerable ·bigbluebutton
- cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:beta3:*:*:*:*:*:* Versions 2.4 beta3 Vulnerable ·bigbluebutton
- cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:beta4:*:*:*:*:*:* Versions 2.4 beta4 Vulnerable ·bigbluebutton
- cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:rc1:*:*:*:*:*:* Versions 2.4 rc1 Vulnerable ·bigbluebutton
- cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:rc3:*:*:*:*:*:* Versions 2.4 rc3 Vulnerable ·bigbluebutton
- cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:rc4:*:*:*:*:*:* Versions 2.4 rc4 Vulnerable ·bigbluebutton
Show 1 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:rc5:*:*:*:*:*:* | 2.4 rc5 | Vulnerable | bigbluebutton |
- cpe:2.3:a:bigbluebutton:bigbluebutton:2.4:rc5:*:*:*:*:*:* Versions 2.4 rc5 Vulnerable ·bigbluebutton
Remediation
- Fix · CNA bigbluebutton (bigbluebutton) Fixed in 2.3.18, 2.4-rc-6
Timeline
- 2026-10-02 Threatist record created from CVE-2022-29236
References
Patch 3
More Bigbluebutton vulnerabilities
- TI-2026-21873 BigBlueButton: Exposed ClamAV port enables Denial of Service CVSS 3.1HIGH 8.2
- TI-2025-38047 BigBlueButton vulnerable to Chat DoS via invalid reactionEmojiId CVSS 3.1HIGH 7.5
- TI-2025-38046 BigBlueButton vulnerable to DoS via PollSubmitVote GraphQL mutation CVSS 3.1HIGH 7.5
- TI-2022-13109 Cross site scripting in username that will trigger by sending chat CVSS 3.1MEDIUM 6.5
- TI-2020-09954 BigBlueButton before 2.2.6 allows remote attackers to read arbitrary files because the… CVSS 3.1CRITICAL 9.8
- TI-2020-16722 BigBlueButton through 2.2.28 uses Ghostscript for processing of uploaded EPS documents… CVSS 3.1CRITICAL 9.8
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences