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Vulnerability details: VCID-wjhn-5pcd-77cv
Vulnerability ID VCID-wjhn-5pcd-77cv
Aliases CVE-2026-2728
GHSA-5gm9-622f-qcg5
Summary LibreNMS versions before 26.3.0 are affected by an authenticated Cross-site Scripting vulnerability on the showconfig page. Successful exploitation requires administrative privileges. Exploitation could result in XSS attacks being performed against other users with access to the page.
Status Published
Exploitability 0.5
Weighted Severity 2.7
Risk 1.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
epss 4e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-2728
cvssv3.1_qr LOW https://github.com/advisories/GHSA-5gm9-622f-qcg5
cvssv3.1 3.5 https://github.com/librenms/librenms
generic_textual LOW https://github.com/librenms/librenms
cvssv3.1 3.5 https://github.com/librenms/librenms/releases/tag/26.3.0
generic_textual LOW https://github.com/librenms/librenms/releases/tag/26.3.0
cvssv3.1 3.5 https://github.com/librenms/librenms/security/advisories/GHSA-5gm9-622f-qcg5
cvssv3.1_qr LOW https://github.com/librenms/librenms/security/advisories/GHSA-5gm9-622f-qcg5
generic_textual LOW https://github.com/librenms/librenms/security/advisories/GHSA-5gm9-622f-qcg5
cvssv4 4.6 https://projectblack.io/blog/librenms-authenticated-rce-and-xss/#xss-on-showconfig-page-2630
ssvc Track https://projectblack.io/blog/librenms-authenticated-rce-and-xss/#xss-on-showconfig-page-2630
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-2728
https://github.com/librenms/librenms/releases/tag/26.3.0
GHSA-5gm9-622f-qcg5 https://github.com/advisories/GHSA-5gm9-622f-qcg5
GHSA-5gm9-622f-qcg5 https://github.com/librenms/librenms/security/advisories/GHSA-5gm9-622f-qcg5
#xss-on-showconfig-page-2630 https://projectblack.io/blog/librenms-authenticated-rce-and-xss/#xss-on-showconfig-page-2630
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N Found at https://github.com/librenms/librenms
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N Found at https://github.com/librenms/librenms/releases/tag/26.3.0
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N Found at https://github.com/librenms/librenms/security/advisories/GHSA-5gm9-622f-qcg5
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N Found at https://projectblack.io/blog/librenms-authenticated-rce-and-xss/#xss-on-showconfig-page-2630
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-13T12:58:56Z/ Found at https://projectblack.io/blog/librenms-authenticated-rce-and-xss/#xss-on-showconfig-page-2630
Exploit Prediction Scoring System (EPSS)
Percentile 0.00141
EPSS Score 4e-05
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:53:50.804689+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/2xxx/CVE-2026-2728.json 38.6.0