CVE-2026-2728
LibreNMS Authenticated Cross-site Scripting
Description
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.
INFO
Published Date :
April 13, 2026, 11:16 a.m.
Last Modified :
April 22, 2026, 7:46 p.m.
Remotely Exploit :
Yes !
Source :
ab69c47f-b95e-4bf2-b2d9-4b1fd1b24b4a
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | ab69c47f-b95e-4bf2-b2d9-4b1fd1b24b4a | ||||
| CVSS 4.0 | MEDIUM | ab69c47f-b95e-4bf2-b2d9-4b1fd1b24b4a |
Solution
- Upgrade LibreNMS to version 26.3.0 or later.
- Restrict administrative access to trusted users.
- Sanitize user input on the showconfig page.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-2728.
| URL | Resource |
|---|---|
| https://projectblack.io/blog/librenms-authenticated-rce-and-xss/#xss-on-showconfig-page-2630 | Exploit Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-2728 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-2728
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-2728 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-2728 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 22, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:* versions up to (excluding) 26.3.0 Added Reference Type PRJBLK: https://projectblack.io/blog/librenms-authenticated-rce-and-xss/#xss-on-showconfig-page-2630 Types: Exploit, Third Party Advisory -
New CVE Received by ab69c47f-b95e-4bf2-b2d9-4b1fd1b24b4a
Apr. 13, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-79 Added Reference https://projectblack.io/blog/librenms-authenticated-rce-and-xss/#xss-on-showconfig-page-2630