MaxSite CMS down_count Plugin cross site scripting
Published Apr 26, 2026
4.8
MEDIUMCVSS 4.0
EPSS 0.38%
Description
A flaw has been found in MaxSite CMS up to 109.3. This vulnerability affects unknown code of the component down_count Plugin. This manipulation of the argument f_file/f_prefix causes cross site scripting. The attack may be initiated remotely. The exploit has been published and may be used. Upgrading to version 109.4 is able to resolve this issue. Patch name: 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7. The affected component should be upgraded. The vendor was informed early about this issue. They classify it as a "Self-XSS". They deployed a countermeasure: "Nevertheless, we consider this a violation of secure coding standards. The lack of filtering via `htmlspecialchars()` has already been fixed in the latest patch to prevent incorrect data display."
Affected products
-
- Version 109.0StatusaffectedConstraints-
- Version 109.1StatusaffectedConstraints-
- Version 109.2StatusaffectedConstraints-
- Version 109.3StatusaffectedConstraints-
- Version 109.4StatusunaffectedConstraints-
- Version
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
1 other source (NVD) ▾
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
AV:N/AC:L/Au:M/C:N/I:P/A:N/E:POC/RL:OF/RC:C
1 other source (NVD) ▾
AV:N/AC:L/Au:M/C:N/I:P/A:N
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Apr 27, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
Apr–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.38% (0.00377) | 29.28th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.27% (0.00269) | 18.27th | v5 (v2026.06.15) |
| Apr 26, 2026 | 0.01% (0.00011) | 1.37th | v4 (v2025.03.14) |
References (7)
- https://github.com/maxsite/cms/ product
- https://github.com/maxsite/cms/commit/8a3946bd0a54bfb72a4d57179fcd253f2c550cd7 patch
- https://github.com/maxsite/cms/releases/tag/v109 patch
- https://github.com/wnaspy/CVE/blob/main/Report-%20Stored%20XSS-in-down_count-plugin-maxsite-cms.pdf.pdf exploit
- https://vuldb.com/submit/796739 third-party-advisory
- https://vuldb.com/vuln/359594 vdb-entrytechnical-description
- https://vuldb.com/vuln/359594/cti signaturepermissions-required
| Link | Providers | Tags |
|---|---|---|
| https://github.com/maxsite/cms/ | product | |
| https://github.com/maxsite/cms/commit/8a3946bd0a54bfb72a4d57179fcd253f2c550cd7 | patch | |
| https://github.com/maxsite/cms/releases/tag/v109 | patch | |
| https://github.com/wnaspy/CVE/blob/main/Report-%20Stored%20XSS-in-down_count-plugin-maxsite-cms.pdf.pdf | exploit | |
| https://vuldb.com/submit/796739 | third-party-advisory | |
| https://vuldb.com/vuln/359594 | vdb-entrytechnical-description | |
| https://vuldb.com/vuln/359594/cti | signaturepermissions-required |
Change history (0)
No recorded changes yet.