How severe is CVE-2026-26987?

CVE-2026-26987 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-26987 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26987?

CVE-2026-26987 affects Librenms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-26987?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-26987 have an EU (EUVD) identifier?

Yes. CVE-2026-26987 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8401.

When was CVE-2026-26987 published?

CVE-2026-26987 was published on 2026-02-20 and last updated on 2026-06-17.

CVE-2026-26987

CVE-2026-26987 is a medium-severity vulnerability in Librenms with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 5.3
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8401
Weakness: CWE-79
Affected product: Librenms
Published: 2026-02-20
Last modified: 2026-06-17

Description

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are vulnerable to Reflected XSS attacks via email field. This issue has been fixed in version 26.2.0.

Frequently asked questions

What is CVE-2026-26987?: LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are vulnerable to Reflected XSS attacks via email field. This issue has been fixed in version 26.2.0.
How severe is CVE-2026-26987?: CVE-2026-26987 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-26987 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26987?: CVE-2026-26987 affects Librenms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-26987?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-26987 have an EU (EUVD) identifier?: Yes. CVE-2026-26987 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8401.
When was CVE-2026-26987 published?: CVE-2026-26987 was published on 2026-02-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:*

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