In vBulletin through 5.3.x, there is an unauthenticated deserialization vulnerability that leads to arbitrary file deletion and, under certain circumstances, code execution, because of unsafe usage of PHP's unserialize() in vB_Library_Template's cacheTemplates() function, which is a publicly exposed API
Published Dec 14, 2017
9.8
CRITICALCVSS 3.0
EPSS 15.19%
Description
In vBulletin through 5.3.x, there is an unauthenticated deserialization vulnerability that leads to arbitrary file deletion and, under certain circumstances, code execution, because of unsafe usage of PHP's unserialize() in vB_Library_Template's cacheTemplates() function, which is a publicly exposed API. This is exploited with the templateidlist parameter to ajax/api/template/cacheTemplates.
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:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/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
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 (28 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 15.19% (0.15189) | 96.65th | v5 (v2026.06.15) |
| Sep 22, 2026 | 15.19% (0.15189) | 96.59th | v5 (v2026.06.15) |
| Sep 21, 2026 | 11.08% (0.11083) | 95.79th | v5 (v2026.06.15) |
| Sep 6, 2026 | 15.19% (0.15189) | 96.52th | v5 (v2026.06.15) |
| Sep 5, 2026 | 11.08% (0.11083) | 95.70th | v5 (v2026.06.15) |
| Aug 30, 2026 | 15.19% (0.15189) | 96.50th | v5 (v2026.06.15) |
| Aug 28, 2026 | 11.08% (0.11083) | 95.67th | v5 (v2026.06.15) |
| Aug 24, 2026 | 15.19% (0.15189) | 96.48th | v5 (v2026.06.15) |
| Aug 23, 2026 | 11.08% (0.11083) | 95.66th | v5 (v2026.06.15) |
| Jun 15, 2026 | 14.91% (0.14912) | 96.27th | v5 (v2026.06.15) |
| Mar 17, 2026 | 14.70% (0.14699) | 94.40th | v4 (v2025.03.14) |
| Jul 23, 2025 | 8.28% (0.08279) | 91.84th | v4 (v2025.03.14) |
| Mar 30, 2025 | 11.34% (0.11337) | 92.91th | v4 (v2025.03.14) |
| Mar 29, 2025 | 27.60% (0.27604) | 94.31th | v4 (v2025.03.14) |
| Mar 17, 2025 | 11.34% (0.11337) | 93.01th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.87% (0.00869) | 83.09th | v3 (v2023.03.01) |
| Jul 17, 2024 | 0.87% (0.00869) | 82.57th | v3 (v2023.03.01) |
| Nov 23, 2023 | 0.89% (0.00894) | 80.83th | v3 (v2023.03.01) |
| Oct 23, 2023 | 0.92% (0.00915) | 81.08th | v3 (v2023.03.01) |
| May 6, 2023 | 1.03% (0.01026) | 81.63th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.08% (0.01078) | 82.01th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.08% (0.05080) | 89.55th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.08% (0.05080) | 88.50th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.08% (0.05080) | 75.02th | v2 (v2022.01.01) |
| Feb 3, 2022 | 4.73% (0.04733) | 77.72th | v1 |
| Jan 6, 2022 | 4.73% (0.04733) | 77.51th | v1 |
| Sep 1, 2021 | 4.73% (0.04733) | 87.04th | v1 |
| Apr 14, 2021 | 4.73% (0.04733) | 0.00th | v1 |
References (2)
- https://blogs.securiteam.com/index.php/archives/3573 x_refsource_MISCExploitThird Party Advisory
- https://www.exploit-db.com/exploits/43362/ exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
| Link | Providers | Tags |
|---|---|---|
| https://blogs.securiteam.com/index.php/archives/3573 | x_refsource_MISCExploitThird Party Advisory | |
| https://www.exploit-db.com/exploits/43362/ | exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry |
Change history (0)
No recorded changes yet.