OPNsense 19.1 Reflected XSS via diag_traceroute.php
Published Feb 15, 2026
5.1
MEDIUMCVSS 4.0
EPSS 0.25%
Description
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted payloads through POST requests to diag_traceroute.php to execute arbitrary JavaScript in the context of a user's browser session.
Affected products
-
- Version 19.1StatusaffectedConstraints-
- Version
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
OPNsense 19.1.1 released
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/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:N/UI:R/S:C/C:L/I:L/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
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 Feb 17, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Feb–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 3, 2026 | 0.25% (0.00250) | 14.85th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.24% (0.00241) | 14.92th | v5 (v2026.06.15) |
| Feb 16, 2026 | 0.03% (0.00033) | 9.12th | v4 (v2025.03.14) |
References (4)
- https://forum.opnsense.org/index.php?topic=11469.0 patchRelease Notes
- https://opnsense.org product
- https://www.exploit-db.com/exploits/46351 exploitThird Party AdvisoryVDB Entry
- https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-diagtraceroutephp third-party-advisoryBroken Link
| Link | Providers | Tags |
|---|---|---|
| https://forum.opnsense.org/index.php?topic=11469.0 | patchRelease Notes | |
| https://opnsense.org | product | |
| https://www.exploit-db.com/exploits/46351 | exploitThird Party AdvisoryVDB Entry | |
| https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-diagtraceroutephp | third-party-advisoryBroken Link |
Change history (0)
No recorded changes yet.