Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-adhj-ruja-n7gb
Vulnerability ID VCID-adhj-ruja-n7gb
Aliases CVE-2026-27016
GHSA-fqx6-693c-f55g
Summary LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 24.10.0 through 26.1.1 are vulnerable to Stored XSS via the unit parameter in Custom OID. The Custom OID functionality lacks strip_tags() sanitization while other fields (name, oid, datatype) are sanitized. The unsanitized value is stored in the database and rendered without HTML escaping. This issue is 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 (4)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-116 Improper Encoding or Escaping of Output
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 4e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-27016
epss 4e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-27016
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-fqx6-693c-f55g
cvssv3.1 5.4 https://github.com/librenms/librenms
generic_textual MODERATE https://github.com/librenms/librenms
cvssv3.1 5.4 https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335
generic_textual MODERATE https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335
ssvc Track https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335
cvssv3.1 5.4 https://github.com/librenms/librenms/pull/19040
generic_textual MODERATE https://github.com/librenms/librenms/pull/19040
ssvc Track https://github.com/librenms/librenms/pull/19040
cvssv3.1 5.4 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 5.4 https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g
cvssv3.1_qr MODERATE https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g
generic_textual MODERATE https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g
ssvc Track https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g
cvssv3.1 5.4 https://nvd.nist.gov/vuln/detail/CVE-2026-27016
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-27016
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-27016
19040 https://github.com/librenms/librenms/pull/19040
26.2.0 https://github.com/librenms/librenms/releases/tag/26.2.0
3bea263e02441690c01dea7fa3fe6ffec94af335 https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335
CVE-2026-27016 https://nvd.nist.gov/vuln/detail/CVE-2026-27016
GHSA-fqx6-693c-f55g https://github.com/advisories/GHSA-fqx6-693c-f55g
GHSA-fqx6-693c-f55g https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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:L/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335
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/2026-02-20T15:26:32Z/ Found at https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/librenms/librenms/pull/19040
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/2026-02-20T15:26:32Z/ Found at https://github.com/librenms/librenms/pull/19040
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N 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/2026-02-20T15:26:32Z/ Found at https://github.com/librenms/librenms/releases/tag/26.2.0
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g
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/2026-02-20T15:26:32Z/ Found at https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-27016
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 0.00194
EPSS Score 4e-05
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:50:46.306186+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/27xxx/CVE-2026-27016.json 38.6.0