# CVE-2026-26989: LibreNMS has a Stored XSS in Alert Rule

Source: https://junglewise.ai/threats/cve-2026-26989-librenms-has-a-stored-xss-in-alert-rule  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-18  
License: CC BY 4.0 with a link back

CVE-2026-26989 · Severity: low · CVSS 3.1 · Published 2026-02-18

LibreNMS has a Stored XSS in Alert Rule

Technologies: [librenms/librenms (Packagist)](https://junglewise.ai/threats/technologies/librenms-librenms). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2026-26989 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-26989 being exploited in the wild.

**How severe is CVE-2026-26989?** Low severity, with a CVSS score of 3.1, published 18 February 2026.

**Which products and versions are affected?** librenms/librenms (Packagist) ECOSYSTEM:introduced=0,fixed=26.2.0.

**Is there a fix for CVE-2026-26989?** Yes. librenms/librenms (Packagist): upgrade to 26.2.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-26989?** Check whether you run librenms/librenms (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- librenms/librenms (Packagist): upgrade to 26.2.0 or later

  ```sh
  composer require librenms/librenms:^26.2.0
  ```


## Affected products

- librenms/librenms (Packagist) ECOSYSTEM:introduced=0,fixed=26.2.0

## Identifiers

- CVE-2026-26989
- GHSA-6xmx-xr9p-58p7

## Related threats

- [LibreNMS stored cross-site scripting in legacy PHP templates](https://junglewise.ai/threats/cve-2026-84192-librenms-stored-cross-site-scripting-in-legacy-php-templates)
- [LibreNMS AboutController remote code execution in snmpget configuration](https://junglewise.ai/threats/cve-2026-84190-librenms-aboutcontroller-remote-code-execution-in-snmpget)
- [LibreNMS stored XSS in Oxidized integration](https://junglewise.ai/threats/cve-2026-84189-librenms-stored-xss-in-oxidized-integration)
- [LibreNMS stored cross-site scripting in graph description settings](https://junglewise.ai/threats/cve-2026-84188-librenms-stored-cross-site-scripting-in-graph-description)
- [LibreNMS remote code execution in Signal alert transport](https://junglewise.ai/threats/cve-2026-55182-librenms-remote-code-execution-in-signal-alert-transport)