xmlhttp.php in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB…
Priority LOW 39CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-284.
Summary
xmlhttp.php in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB Merge System before 1.8.6 allows remote attackers to bypass intended access restrictions via vectors related to the forum password.
Why it matters now
EPSS 0.01631 76th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mybb:merge_system:*:*:*:*:*:*:*:* | up to 1.8.5 | Vulnerable | mybb |
| cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:* | up to 1.6.17 | Vulnerable | mybb |
| cpe:2.3:a:mybb:mybb:1.8.0:*:*:*:*:*:*:* | 1.8.0 | Vulnerable | mybb |
| cpe:2.3:a:mybb:mybb:1.8.1:*:*:*:*:*:*:* | 1.8.1 | Vulnerable | mybb |
| cpe:2.3:a:mybb:mybb:1.8.2:*:*:*:*:*:*:* | 1.8.2 | Vulnerable | mybb |
| cpe:2.3:a:mybb:mybb:1.8.3:*:*:*:*:*:*:* | 1.8.3 | Vulnerable | mybb |
| cpe:2.3:a:mybb:mybb:1.8.4:*:*:*:*:*:*:* | 1.8.4 | Vulnerable | mybb |
| cpe:2.3:a:mybb:mybb:1.8.5:*:*:*:*:*:*:* | 1.8.5 | Vulnerable | mybb |
- cpe:2.3:a:mybb:merge_system:*:*:*:*:*:*:*:* Versions up to 1.8.5 Vulnerable ·mybb
- cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:* Versions up to 1.6.17 Vulnerable ·mybb
- cpe:2.3:a:mybb:mybb:1.8.0:*:*:*:*:*:*:* Versions 1.8.0 Vulnerable ·mybb
- cpe:2.3:a:mybb:mybb:1.8.1:*:*:*:*:*:*:* Versions 1.8.1 Vulnerable ·mybb
- cpe:2.3:a:mybb:mybb:1.8.2:*:*:*:*:*:*:* Versions 1.8.2 Vulnerable ·mybb
- cpe:2.3:a:mybb:mybb:1.8.3:*:*:*:*:*:*:* Versions 1.8.3 Vulnerable ·mybb
- cpe:2.3:a:mybb:mybb:1.8.4:*:*:*:*:*:*:* Versions 1.8.4 Vulnerable ·mybb
- cpe:2.3:a:mybb:mybb:1.8.5:*:*:*:*:*:*:* Versions 1.8.5 Vulnerable ·mybb
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2015-8973
- 2026-10-03 Alias added: GHSA-xfw3-v3jx-w637
References
More mybb Merge System vulnerabilities
- TI-2016-07692 MyBB (aka MyBulletinBoard) before 1.8.8 and MyBB Merge System before 1.8.8 allow remote… CVSS 3.0CRITICAL 9.8
- TI-2016-07675 newreply.php in MyBB (aka MyBulletinBoard) before 1.8.7 and MyBB Merge System before… CVSS 3.0CRITICAL 9.8
- TI-2015-07387 SQL injection vulnerability in the Group Promotions module in the admin control panel in… CVSS 3.0CRITICAL 10.0
- TI-2016-07688 SQL injection vulnerability in the users data handler in MyBB (aka MyBulletinBoard)… CVSS 3.0CRITICAL 9.8
- TI-2016-07684 MyBB (aka MyBulletinBoard) before 1.8.7 and MyBB Merge System before 1.8.7 allow… CVSS 3.0CRITICAL 9.8
- TI-2016-07674 SQL injection vulnerability in the moderation tool in MyBB (aka MyBulletinBoard) before… CVSS 3.0CRITICAL 9.8
Sources
- CVE-2015-8973 · CVE Program
- CVE-2015-8973 · NVD
- FIRST EPSS
- GHSA-xfw3-v3jx-w637 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences