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CVE-2026-40457

Reflected XSS in LMS

LOW
2.1
CVSS Score
Published: June 18, 2026 at 10:58 AM UTC
Updated: June 22, 2026 at 11:18 PM UTC
1 product affected across 1 vendorLMS

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Severity
LOW2.1
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

LMS· Lms
60%
v < 9c5651b
Affected range stops below 9c5651b, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Patch
Source: cverecord
https://github.com/chilek/lms/commit/9c5651b39bfd086cc34fc9a78ddaa8c0815af114
Third Party Advisory
Source: cverecord
https://cert.pl/posts/2026/06/CVE-2026-40455
Product
Source: cverecord
https://lms.org.pl/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

2.1LOWCERT-PL
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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