WordPress version <4.9 contains a CWE-20 Input Validation vulnerability in thumbnail processing that can result in remote code execution
Published Sep 6, 2018
8.8
HIGHCVSS 3.0
EPSS 3.80%
Description
WordPress version <4.9 contains a CWE-20 Input Validation vulnerability in thumbnail processing that can result in remote code execution. This attack appears to be exploitable via thumbnail upload by an authenticated user and may require additional plugins in order to be exploited however this has not been confirmed at this time. This issue appears to have been partially, but not completely fixed in WordPress 4.9
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:S/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
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (27 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.80% (0.03798) | 89.66th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.80% (0.03798) | 88.58th | v5 (v2026.06.15) |
| Dec 28, 2025 | 20.62% (0.20622) | 95.39th | v4 (v2025.03.14) |
| Dec 27, 2025 | 15.77% (0.15774) | 94.54th | v4 (v2025.03.14) |
| Dec 4, 2025 | 20.62% (0.20622) | 95.35th | v4 (v2025.03.14) |
| Oct 28, 2025 | 23.44% (0.23441) | 95.72th | v4 (v2025.03.14) |
| Oct 27, 2025 | 18.12% (0.18116) | 94.91th | v4 (v2025.03.14) |
| Oct 1, 2025 | 23.44% (0.23441) | 95.80th | v4 (v2025.03.14) |
| Jul 30, 2025 | 18.75% (0.18752) | 95.01th | v4 (v2025.03.14) |
| Mar 30, 2025 | 22.54% (0.22540) | 95.36th | v4 (v2025.03.14) |
| Mar 29, 2025 | 54.74% (0.54744) | 97.15th | v4 (v2025.03.14) |
| Mar 24, 2025 | 22.54% (0.22540) | 95.34th | v4 (v2025.03.14) |
| Mar 23, 2025 | 26.79% (0.26788) | 95.74th | v4 (v2025.03.14) |
| Mar 17, 2025 | 22.54% (0.22540) | 95.39th | v4 (v2025.03.14) |
| Jul 20, 2024 | 1.01% (0.01013) | 83.89th | v3 (v2023.03.01) |
| Jul 16, 2024 | 1.01% (0.01013) | 83.89th | v3 (v2023.03.01) |
| Jan 28, 2024 | 0.99% (0.00990) | 81.92th | v3 (v2023.03.01) |
| Aug 31, 2023 | 1.06% (0.01063) | 82.34th | v3 (v2023.03.01) |
| Apr 22, 2023 | 1.11% (0.01107) | 82.35th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.01% (0.01013) | 81.41th | v3 (v2023.03.01) |
| Mar 6, 2023 | 4.57% (0.04571) | 88.92th | v2 (v2022.01.01) |
| Apr 1, 2022 | 4.57% (0.04571) | 87.83th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.57% (0.04571) | 74.15th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.83% (0.01828) | 35.38th | v1 |
| Jan 6, 2022 | 1.83% (0.01828) | 34.69th | v1 |
| Sep 1, 2021 | 1.83% (0.01828) | 74.99th | v1 |
| Apr 14, 2021 | 1.83% (0.01828) | 0.00th | v1 |
References (3)
- http://www.securityfocus.com/bid/105305 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://www.theregister.co.uk/2018/08/20/php_unserialisation_wordpress_vuln/ x_refsource_MISCThird Party Advisory
- https://youtu.be/GePBmsNJw6Y?t=1763 x_refsource_MISCThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/105305 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://www.theregister.co.uk/2018/08/20/php_unserialisation_wordpress_vuln/ | x_refsource_MISCThird Party Advisory | |
| https://youtu.be/GePBmsNJw6Y?t=1763 | x_refsource_MISCThird Party Advisory |
Change history (0)
No recorded changes yet.