CVE-2026-84189

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-01. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: Elevated riskExposed: 0

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

LibreNMS through 26.4.0 renders JSON fields (name, ip, model, author, commit message) returned by the admin-configurable Oxidized integration URL (oxidized.url) into the device showconfig page without applying htmlspecialchars(). An administrator who points the Oxidized URL at an attacker-controlled server (SSRF) can cause it to return malicious JSON, resulting in stored/persistent cross-site scripting affecting all users who view any device's showconfig tab. Fixed in 26.7.0.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
52(Track*)
EG Risk 52/100SSVC: 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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
29%
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

LibreNMS before 26.7.0 Stored XSS via Oxidized API | Advisories | VulnCheck

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

SSRF-driven stored XSS via Oxidized API response fields in device showconfig page · Advisory · librenms/librenms · GitHub

https://github.com/librenms/librenms/security/advisories/GHSA-7gww-x7fh-jf9j

Vendor Advisories for CVE-2026-84189(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 28× in last 7d / 96× 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 11:52 UTCGHSA enrichment
  2. 2026-09-25 00:32 UTCEG score recompute
  3. 2026-09-25 00:32 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 13:12 UTCGHSA enrichment
  6. 2026-09-24 01:52 UTCEG score recompute
  7. 2026-09-24 01:52 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 14:33 UTCGHSA enrichment
  10. 2026-09-23 03:13 UTCEG score recompute
  11. 2026-09-23 03:13 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 15:53 UTCGHSA enrichment
  14. 2026-09-22 04:34 UTCEG score recompute
  15. 2026-09-22 04:34 UTCGHSA enrichment
  16. 2026-09-21 21:09 UTCEPSS rescore
  17. 2026-09-21 17:14 UTCGHSA enrichment
  18. 2026-09-21 05:08 UTCEG score recompute
  19. 2026-09-21 05:08 UTCGHSA enrichment
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-20 17:16 UTCGHSA enrichment
  22. 2026-09-20 05:52 UTCGHSA enrichment
  23. 2026-09-19 18:33 UTCEG score recompute
  24. 2026-09-19 18:33 UTCGHSA enrichment
  25. 2026-09-19 07:13 UTCGHSA enrichment
Show 71 more
  1. 2026-09-18 19:53 UTCEG score recompute
  2. 2026-09-18 19:53 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 08:33 UTCGHSA enrichment
  5. 2026-09-17 21:13 UTCEG score recompute
  6. 2026-09-17 21:13 UTCGHSA enrichment
  7. 2026-09-17 19:32 UTCEPSS rescore
  8. 2026-09-17 09:54 UTCGHSA enrichment
  9. 2026-09-16 22:34 UTCEG score recompute
  10. 2026-09-16 22:34 UTCGHSA enrichment
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 11:03 UTCEG score recompute
  13. 2026-09-16 11:03 UTCGHSA enrichment
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-15 23:43 UTCGHSA enrichment
  16. 2026-09-15 12:23 UTCEG score recompute
  17. 2026-09-15 12:23 UTCGHSA enrichment
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-15 01:02 UTCGHSA enrichment
  21. 2026-09-14 13:42 UTCGHSA enrichment
  22. 2026-09-14 02:14 UTCEG score recompute
  23. 2026-09-14 02:14 UTCGHSA enrichment
  24. 2026-09-13 14:55 UTCGHSA enrichment
  25. 2026-09-13 03:26 UTCGHSA enrichment
  26. 2026-09-12 16:06 UTCEG score recompute
  27. 2026-09-12 16:06 UTCGHSA enrichment
  28. 2026-09-12 04:47 UTCGHSA enrichment
  29. 2026-09-11 17:27 UTCEG score recompute
  30. 2026-09-11 17:27 UTCGHSA enrichment
  31. 2026-09-11 14:53 UTCEPSS rescore
  32. 2026-09-11 14:53 UTCEPSS rescore
  33. 2026-09-11 05:36 UTCGHSA enrichment
  34. 2026-09-10 18:15 UTCEG score recompute
  35. 2026-09-10 18:15 UTCGHSA enrichment
  36. 2026-09-10 06:53 UTCGHSA enrichment
  37. 2026-09-09 19:33 UTCGHSA enrichment
  38. 2026-09-09 08:10 UTCEG score recompute
  39. 2026-09-09 08:10 UTCGHSA enrichment
  40. 2026-09-08 22:01 UTCEPSS rescore
  41. 2026-09-08 20:51 UTCGHSA enrichment
  42. 2026-09-08 10:02 UTCGHSA enrichment
  43. 2026-09-07 22:14 UTCGHSA enrichment
  44. 2026-09-07 10:52 UTCGHSA enrichment
  45. 2026-09-06 23:30 UTCEG score recompute
  46. 2026-09-06 23:30 UTCGHSA enrichment
  47. 2026-09-06 13:48 UTCEPSS rescore
  48. 2026-09-06 12:10 UTCGHSA enrichment
  49. 2026-09-06 00:49 UTCEG score recompute
  50. 2026-09-06 00:49 UTCGHSA enrichment
  51. 2026-09-05 15:31 UTCEPSS rescore
  52. 2026-09-05 13:28 UTCGHSA enrichment
  53. 2026-09-05 02:08 UTCGHSA enrichment
  54. 2026-09-04 14:49 UTCEG score recompute
  55. 2026-09-04 14:49 UTCGHSA enrichment
  56. 2026-09-04 05:07 UTCEPSS rescore
  57. 2026-09-04 03:23 UTCEG score recompute
  58. 2026-09-04 03:23 UTCGHSA enrichment
  59. 2026-09-04 02:45 UTCEG score recompute
  60. 2026-09-04 02:45 UTCGHSA enrichment
  61. 2026-09-03 21:05 UTCGHSA enrichment
  62. 2026-09-03 09:44 UTCGHSA enrichment
  63. 2026-09-02 22:24 UTCEG score recompute
  64. 2026-09-02 22:24 UTCGHSA enrichment
  65. 2026-09-02 14:12 UTCEPSS rescore
  66. 2026-09-02 11:05 UTCGHSA enrichment
  67. 2026-09-01 23:45 UTCEG score recompute
  68. 2026-09-01 23:45 UTCGHSA enrichment
  69. 2026-09-01 12:26 UTCEG score recompute
  70. 2026-09-01 11:43 UTCEG score recompute
  71. 2026-09-01 11:41 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-84189?
CVE-2026-84189 is a high vulnerability published on September 1, 2026. LibreNMS through 26.4.0 renders JSON fields (name, ip, model, author, commit message) returned by the admin-configurable Oxidized integration URL (oxidized.url) into the device showconfig page without applying htmlspecialchars(). An administrator who points the Oxidized URL at an…
When was CVE-2026-84189 disclosed?
CVE-2026-84189 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-2026-84189 actively exploited?
CVE-2026-84189 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 70.6% of all scored CVEs.
What is the CVSS score of CVE-2026-84189?
CVE-2026-84189 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-84189?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84189, 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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