CVE-2026-26991: LibreNMS /device-groups name Stored Cross-Site Scripting

CVE-2026-26991 · Severity: medium · CVSS 4 · Published 2026-02-18

LibreNMS /device-groups name Stored Cross-Site Scripting

Technologies: librenms/librenms (Packagist). Vendors: Packagist.

Quick answers

Is CVE-2026-26991 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-26991 being exploited in the wild.
How severe is CVE-2026-26991?
Medium severity, with a CVSS score of 4, 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-2026-26991?
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-2026-26991?
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
    composer require librenms/librenms:^26.2.0

Affected products

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

Identifiers

  • CVE-2026-26991
  • GHSA-5pqf-54qp-32wx

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