CVE-2026-2728: LibreNMS versions before 26.3.0 are affected by an authenticated Cross-site Scripting vulnerability on the sho

Q: How do I fix CVE-2026-2728?

librenms: upgrade to 26.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-2728 being exploited?

CVE-2026-2728 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-2728 affect?

CVE-2026-2728 affects librenms. Severity is medium (CVSS 4.8). 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

Q: How urgent is CVE-2026-2728?

Priority 25/100. Public exploit reference

Routine

MEDIUM 4.8UPGRADE

CVE-2026-2728 is a medium-severity flaw (CVSS 4.8) affecting librenms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-13
Last modified	2026-06-17

Publisher (CNA): PRJBLK · Vendor: librenms

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-13 11:16 UTCPublished CVE record published
2026-06-17 10:31 UTCUpdated Record last modified

librenms librenms UPGRADE

Affected: < 26.3.0

Fixed in: 26.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy librenms || rpm -q librenms || librenms --version

2. UPGRADE to 26.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade librenms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade librenms

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-2728?

librenms: upgrade to 26.3.0. Exact commands for each OS are on this page.

Is CVE-2026-2728 being exploited?

CVE-2026-2728 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-2728 affect?

CVE-2026-2728 affects librenms. Severity is medium (CVSS 4.8). 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

How urgent is CVE-2026-2728?

Priority 25/100. Public exploit reference

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References

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