HIGH
wp-includes/ms-functions.php in the Multisite WordPress API in WordPress before 4.7.1 does not properly choose random numbers for keys, which makes it easier for remote attackers to bypass intended access restrictions via a crafted (1) site signup or (2) user signup
Published Jan 15, 2017
7.5
HIGHCVSS 3.0
EPSS 2.89%
Description
wp-includes/ms-functions.php in the Multisite WordPress API in WordPress before 4.7.1 does not properly choose random numbers for keys, which makes it easier for remote attackers to bypass intended access restrictions via a crafted (1) site signup or (2) user signup.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
7.5 HIGH NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact High
Availability Impact None
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:P/A:N
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.89% 0.02886
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02886
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (36 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.89% (0.02886) | 86.39th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.89% (0.02886) | 85.01th | v5 (v2026.06.15) |
| Mar 4, 2026 | 1.67% (0.01668) | 81.82th | v4 (v2025.03.14) |
| Mar 1, 2026 | 3.33% (0.03328) | 87.11th | v4 (v2025.03.14) |
| Feb 4, 2026 | 1.67% (0.01668) | 81.72th | v4 (v2025.03.14) |
| Feb 1, 2026 | 3.33% (0.03328) | 87.02th | v4 (v2025.03.14) |
| Jan 4, 2026 | 1.67% (0.01668) | 81.64th | v4 (v2025.03.14) |
| Jan 1, 2026 | 3.33% (0.03328) | 86.98th | v4 (v2025.03.14) |
| Dec 4, 2025 | 1.67% (0.01668) | 81.54th | v4 (v2025.03.14) |
| Dec 1, 2025 | 3.33% (0.03328) | 86.90th | v4 (v2025.03.14) |
| Nov 4, 2025 | 1.67% (0.01668) | 81.48th | v4 (v2025.03.14) |
| Nov 1, 2025 | 3.33% (0.03328) | 86.82th | v4 (v2025.03.14) |
| Oct 4, 2025 | 1.67% (0.01668) | 81.46th | v4 (v2025.03.14) |
| Oct 1, 2025 | 3.33% (0.03328) | 86.84th | v4 (v2025.03.14) |
| Sep 4, 2025 | 1.54% (0.01544) | 80.72th | v4 (v2025.03.14) |
| Sep 1, 2025 | 2.67% (0.02669) | 85.32th | v4 (v2025.03.14) |
| Aug 4, 2025 | 1.54% (0.01544) | 80.63th | v4 (v2025.03.14) |
| Aug 1, 2025 | 3.09% (0.03088) | 86.36th | v4 (v2025.03.14) |
| Jul 4, 2025 | 1.67% (0.01668) | 81.30th | v4 (v2025.03.14) |
| Jul 1, 2025 | 3.35% (0.03351) | 86.85th | v4 (v2025.03.14) |
| Jun 4, 2025 | 1.67% (0.01668) | 81.20th | v4 (v2025.03.14) |
| Jun 1, 2025 | 3.35% (0.03351) | 86.78th | v4 (v2025.03.14) |
| May 4, 2025 | 1.67% (0.01668) | 81.09th | v4 (v2025.03.14) |
| May 1, 2025 | 3.35% (0.03351) | 86.67th | v4 (v2025.03.14) |
| Mar 30, 2025 | 1.67% (0.01668) | 80.41th | v4 (v2025.03.14) |
| Mar 29, 2025 | 7.61% (0.07613) | 86.16th | v4 (v2025.03.14) |
| Mar 24, 2025 | 1.67% (0.01668) | 80.38th | v4 (v2025.03.14) |
| Mar 23, 2025 | 7.61% (0.07613) | 90.45th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.67% (0.01668) | 80.84th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.66% (0.00657) | 80.21th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.66% (0.00657) | 78.84th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.66% (0.00657) | 76.33th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.41% (0.01408) | 72.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.41% (0.01408) | 49.94th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.33% (0.02335) | 53.78th | v5 (v2026.06.15) |
| Apr 14, 2021 | 2.33% (0.02335) | 0.00th | v1 |
Weaknesses (1)
References (8)
- http://www.debian.org/security/2017/dsa-3779 vendor-advisoryx_refsource_DEBIAN
- http://www.openwall.com/lists/oss-security/2017/01/14/6 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/95401 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1037591 vdb-entryx_refsource_SECTRACK
- https://codex.wordpress.org/Version_4.7.1 x_refsource_CONFIRMRelease NotesVendor Advisory
- https://github.com/WordPress/WordPress/commit/cea9e2dc62abf777e06b12ec4ad9d1aaa49b29f4 x_refsource_CONFIRMPatch
- https://wordpress.org/news/2017/01/wordpress-4-7-1-security-and-maintenance-release/ x_refsource_CONFIRMVendor Advisory
- https://wpvulndb.com/vulnerabilities/8721 x_refsource_MISC
| Link | Providers | Tags |
|---|---|---|
| http://www.debian.org/security/2017/dsa-3779 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.openwall.com/lists/oss-security/2017/01/14/6 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| http://www.securityfocus.com/bid/95401 | vdb-entryx_refsource_BID | |
| http://www.securitytracker.com/id/1037591 | vdb-entryx_refsource_SECTRACK | |
| https://codex.wordpress.org/Version_4.7.1 | x_refsource_CONFIRMRelease NotesVendor Advisory | |
| https://github.com/WordPress/WordPress/commit/cea9e2dc62abf777e06b12ec4ad9d1aaa49b29f4 | x_refsource_CONFIRMPatch | |
| https://wordpress.org/news/2017/01/wordpress-4-7-1-security-and-maintenance-release/ | x_refsource_CONFIRMVendor Advisory | |
| https://wpvulndb.com/vulnerabilities/8721 | x_refsource_MISC |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jan 15, 2017
Updated Aug 5, 2024
Reserved Jan 14, 2017
Link CVE-2017-5493
CISA Vulnrichment
Updated n/a