The my_rand function in functions.php in MyBB (aka MyBulletinBoard) before 1.4.12 does not properly use the PHP mt_rand function, which makes it easier for remote attackers to obtain access to an arbitrary account by requesting a reset of the account's password, and then conducting a brute-force attack
Published Dec 30, 2010
5.1
MEDIUMCVSS 2.0
EPSS 2.15%
Description
The my_rand function in functions.php in MyBB (aka MyBulletinBoard) before 1.4.12 does not properly use the PHP mt_rand function, which makes it easier for remote attackers to obtain access to an arbitrary account by requesting a reset of the account's password, and then conducting a brute-force attack.
Affected products
No data.
- ≤ 1.4.11
- 1.00
- 1.01
- 1.1.0
- 1.1.1
- 1.1.2
- 1.1.3
- 1.1.4
- 1.1.5
- 1.1.6
- 1.1.7
- 1.1.8
- 1.02
- 1.2
- 1.2.0
- 1.2.1
- 1.2.2
- 1.2.3
- 1.2.4
- 1.2.5
- 1.2.6
- 1.2.7
- 1.2.8
- 1.2.9
- 1.2.10
- 1.2.11
- 1.2.12
- 1.2.13
- 1.03
- 1.04
- 1.4.0
- 1.4.2
- 1.4.3
- 1.4.6
- 1.4.8
- 1.4.9
- 1.4.10
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:H/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.15% (0.02154) | 81.49th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.15% (0.02154) | 79.72th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.33% (0.01334) | 78.64th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.72% (0.00722) | 81.27th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.72% (0.00722) | 80.01th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.72% (0.00722) | 77.59th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
References (7)
- http://blog.mybb.com/2010/04/13/mybb-1-4-12-released-security-maintenance-update/ x_refsource_CONFIRM
- http://dev.mybboard.net/issues/843 x_refsource_CONFIRM
- http://dev.mybboard.net/projects/mybb/repository/revisions/4872 x_refsource_CONFIRM
- http://openwall.com/lists/oss-security/2010/10/08/7 mailing-listx_refsource_MLIST
- http://openwall.com/lists/oss-security/2010/10/11/8 mailing-listx_refsource_MLIST
- http://openwall.com/lists/oss-security/2010/12/06/2 mailing-listx_refsource_MLIST
- https://exchange.xforce.ibmcloud.com/vulnerabilities/64516 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://blog.mybb.com/2010/04/13/mybb-1-4-12-released-security-maintenance-update/ | x_refsource_CONFIRM | |
| http://dev.mybboard.net/issues/843 | x_refsource_CONFIRM | |
| http://dev.mybboard.net/projects/mybb/repository/revisions/4872 | x_refsource_CONFIRM | |
| http://openwall.com/lists/oss-security/2010/10/08/7 | mailing-listx_refsource_MLIST | |
| http://openwall.com/lists/oss-security/2010/10/11/8 | mailing-listx_refsource_MLIST | |
| http://openwall.com/lists/oss-security/2010/12/06/2 | mailing-listx_refsource_MLIST | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/64516 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.