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Vulnerability details: VCID-js2a-whr7-dufs
Vulnerability ID VCID-js2a-whr7-dufs
Aliases CVE-2026-26989
GHSA-6xmx-xr9p-58p7
Summary LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are affected by a Stored Cross-Site Scripting (XSS) vulnerability in the Alert Rules workflow. An attacker with administrative privileges can inject malicious scripts that execute in the browser context of any user who accesses the Alert Rules page. This issue has been fixed in version 26.2.0.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 3e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-26989
epss 3e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-26989
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-6xmx-xr9p-58p7
cvssv3.1 4.3 https://github.com/librenms/librenms
generic_textual MODERATE https://github.com/librenms/librenms
cvssv3.1 4.3 https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58
generic_textual MODERATE https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58
ssvc Track https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58
cvssv3.1 4.3 https://github.com/librenms/librenms/pull/19039
generic_textual MODERATE https://github.com/librenms/librenms/pull/19039
ssvc Track https://github.com/librenms/librenms/pull/19039
cvssv3.1 4.3 https://github.com/librenms/librenms/releases/tag/26.2.0
generic_textual MODERATE https://github.com/librenms/librenms/releases/tag/26.2.0
ssvc Track https://github.com/librenms/librenms/releases/tag/26.2.0
cvssv3.1 4.3 https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7
cvssv3.1_qr MODERATE https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7
generic_textual MODERATE https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7
ssvc Track https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7
cvssv3.1 4.3 https://nvd.nist.gov/vuln/detail/CVE-2026-26989
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-26989
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-26989
087608cf9f851189847cb8e8e5ad002e59170c58 https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58
19039 https://github.com/librenms/librenms/pull/19039
26.2.0 https://github.com/librenms/librenms/releases/tag/26.2.0
CVE-2026-26989 https://nvd.nist.gov/vuln/detail/CVE-2026-26989
GHSA-6xmx-xr9p-58p7 https://github.com/advisories/GHSA-6xmx-xr9p-58p7
GHSA-6xmx-xr9p-58p7 https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L 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:L Found at https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-20T15:26:36Z/ Found at https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L Found at https://github.com/librenms/librenms/pull/19039
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-20T15:26:36Z/ Found at https://github.com/librenms/librenms/pull/19039
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L Found at https://github.com/librenms/librenms/releases/tag/26.2.0
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-20T15:26:36Z/ Found at https://github.com/librenms/librenms/releases/tag/26.2.0
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L Found at https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-20T15:26:36Z/ Found at https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L Found at https://nvd.nist.gov/vuln/detail/CVE-2026-26989
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
Exploit Prediction Scoring System (EPSS)
Percentile 0.00137
EPSS Score 3e-05
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:44:30.960743+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/26xxx/CVE-2026-26989.json 38.6.0