CVE-2026-84188

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreHIGH confidence

Score 4.8 from GitHub Security Advisory published 2026-09-01. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

LibreNMS versions <= 26.4.0 contain a stored cross-site scripting vulnerability in the graph_descr. configuration settings, which are echoed verbatim without HTML escaping in includes/html/pages/graphs.inc.php. An administrator can store a malicious HTML payload that executes in the browser of any authenticated user who views the affected graph type. The issue is fixed in version 26.7.0.

CVSS v3
4.8
EG Score
4.8(high)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity48% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

September 1, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Sep 1, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic Patch Available

librenms before 26.7.0 Stored XSS via graph_descr settings | Advisories | VulnCheck

https://www.vulncheck.com/advisories/librenms-before-26.7.0-stored-xss-via-graph-descr-settings
github Patch Available🟡 PoC Available

Stored XSS via graph_descr admin config settings echoed without escaping to all authenticated users · Advisory · librenms/librenms · GitHub

https://github.com/librenms/librenms/security/advisories/GHSA-7cj5-v4pp-v632

Vendor Advisories for CVE-2026-84188(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
librenms/librenms1.19 ... 26.6.1 (158 versions)26.7.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 69× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-25 08:55 UTCEG score recompute
  2. 2026-09-25 08:55 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 08:18 UTCEG score recompute
  5. 2026-09-24 08:18 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 07:41 UTCEG score recompute
  8. 2026-09-23 07:41 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 07:05 UTCEG score recompute
  11. 2026-09-22 07:04 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 06:27 UTCEG score recompute
  14. 2026-09-21 06:27 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 05:50 UTCEG score recompute
  17. 2026-09-20 05:50 UTCGHSA enrichment
  18. 2026-09-19 05:13 UTCEG score recompute
  19. 2026-09-19 05:13 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 04:37 UTCEG score recompute
  22. 2026-09-18 04:37 UTCGHSA enrichment
  23. 2026-09-17 19:32 UTCEPSS rescore
  24. 2026-09-17 04:00 UTCEG score recompute
  25. 2026-09-17 04:00 UTCGHSA enrichment
Show 44 more
  1. 2026-09-16 14:09 UTCEPSS rescore
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-16 03:23 UTCEG score recompute
  4. 2026-09-16 03:23 UTCGHSA enrichment
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-15 02:44 UTCGHSA enrichment
  8. 2026-09-14 02:07 UTCEG score recompute
  9. 2026-09-14 02:07 UTCGHSA enrichment
  10. 2026-09-13 01:30 UTCEG score recompute
  11. 2026-09-13 01:30 UTCGHSA enrichment
  12. 2026-09-12 00:53 UTCEG score recompute
  13. 2026-09-12 00:53 UTCGHSA enrichment
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 00:16 UTCEG score recompute
  17. 2026-09-11 00:16 UTCGHSA enrichment
  18. 2026-09-09 23:39 UTCEG score recompute
  19. 2026-09-09 23:39 UTCGHSA enrichment
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-08 20:51 UTCGHSA enrichment
  22. 2026-09-07 18:42 UTCEG score recompute
  23. 2026-09-07 18:42 UTCGHSA enrichment
  24. 2026-09-06 18:05 UTCEG score recompute
  25. 2026-09-06 18:05 UTCGHSA enrichment
  26. 2026-09-06 13:48 UTCEPSS rescore
  27. 2026-09-05 17:28 UTCEG score recompute
  28. 2026-09-05 17:28 UTCGHSA enrichment
  29. 2026-09-05 15:31 UTCEPSS rescore
  30. 2026-09-04 16:50 UTCEG score recompute
  31. 2026-09-04 16:49 UTCGHSA enrichment
  32. 2026-09-04 05:07 UTCEPSS rescore
  33. 2026-09-03 16:11 UTCEG score recompute
  34. 2026-09-03 16:11 UTCGHSA enrichment
  35. 2026-09-02 15:34 UTCEG score recompute
  36. 2026-09-02 15:34 UTCGHSA enrichment
  37. 2026-09-02 15:01 UTCEG score recompute
  38. 2026-09-02 15:01 UTCGHSA enrichment
  39. 2026-09-02 14:12 UTCEPSS rescore
  40. 2026-09-02 13:04 UTCEG score recompute
  41. 2026-09-02 13:04 UTCGHSA enrichment
  42. 2026-09-01 12:26 UTCEG score recompute
  43. 2026-09-01 11:43 UTCEG score recompute
  44. 2026-09-01 11:41 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-84188?
CVE-2026-84188 is a medium vulnerability published on September 1, 2026. LibreNMS versions <= 26.4.0 contain a stored cross-site scripting vulnerability in the graph_descr.<graphtype> configuration settings, which are echoed verbatim without HTML escaping in includes/html/pages/graphs.inc.php. An administrator can store a malicious HTML payload that executes in the…
When was CVE-2026-84188 disclosed?
CVE-2026-84188 was first published in the National Vulnerability Database on September 1, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84188 actively exploited?
CVE-2026-84188 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 85.2% of all scored CVEs.
What is the CVSS score of CVE-2026-84188?
CVE-2026-84188 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-84188?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84188, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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