CVE-2026-48687

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-26. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

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

FastNetMon Community Edition through 1.2.9 contains an OS command injection vulnerability in the Juniper router integration plugin. The _log() function in src/juniper_plugin/fastnetmon_juniper.php (lines 117-118) constructs shell commands by concatenating the $msg parameter directly into exec() calls: exec("echo date \"- {FASTNETMON] - " . $msg . " \" >> " . $FILE_LOG_TMP). The $msg variable contains unsanitized data derived from command-line arguments argv[1] through argv[3], which represent the attack IP address, direction, and power. While FastNetMon's C++ core currently passes IP addresses via inet_ntoa() (which only produces safe dotted-decimal notation), the PHP script performs no input validation or shell escaping. If the script is invoked directly, by another orchestration system, or if future code changes pass string-sourced IPs, arbitrary commands can be injected. The correct fix is to replace exec() with file_put_contents() or use escapeshellarg() on all parameters.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
73.8%
KEV
Not listed

Published

May 26, 2026

Last Modified

May 27, 2026

Advisory Details (3)

Auto-updated Jun 20, 2026
No patch confirmed yet.
generic

CVE-2026-48687: OS Command Injection in FastNetMon Juniper Plugin Logging | Lorikeet Security

https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48687-juniper-cmd-injection
generic

fastnetmon/src/juniper_plugin/fastnetmon_juniper.php at master · pavel-odintsov/fastnetmon · GitHub

https://github.com/pavel-odintsov/fastnetmon/blob/master/src/juniper_plugin/fastnetmon_juniper.php
generic

GitHub - pavel-odintsov/fastnetmon: Very fast DDoS sensor with sFlow/Netflow/IPFIX/SPAN support · GitHub

https://github.com/pavel-odintsov/fastnetmon

Vendor Advisories for CVE-2026-48687(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 87× 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.

Showing the most recent 100 of 300 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-13 22:30 UTCEPSS rescore
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-12 05:46 UTCEPSS rescore
  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-08 15:16 UTCEPSS rescore
  9. 2026-07-07 13:46 UTCEPSS rescore
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-06 02:23 UTCEPSS rescore
  12. 2026-07-05 02:30 UTCEPSS rescore
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-01 15:07 UTCEPSS rescore
  15. 2026-06-30 23:22 UTCEPSS rescore
  16. 2026-06-29 20:00 UTCEG score recompute
  17. 2026-06-29 20:00 UTCGHSA enrichment
  18. 2026-06-29 15:58 UTCEG score recompute
  19. 2026-06-29 15:58 UTCGHSA enrichment
  20. 2026-06-29 14:06 UTCEPSS rescore
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-29 01:30 UTCEG score recompute
  23. 2026-06-29 01:30 UTCGHSA enrichment
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 11:40 UTCEG score recompute
Show 75 more
  1. 2026-06-28 11:40 UTCGHSA enrichment
  2. 2026-06-28 07:39 UTCEG score recompute
  3. 2026-06-28 07:39 UTCGHSA enrichment
  4. 2026-06-28 04:56 UTCEPSS rescore
  5. 2026-06-28 04:56 UTCEPSS rescore
  6. 2026-06-28 03:27 UTCEG score recompute
  7. 2026-06-28 03:27 UTCGHSA enrichment
  8. 2026-06-27 23:26 UTCEG score recompute
  9. 2026-06-27 23:26 UTCGHSA enrichment
  10. 2026-06-27 19:24 UTCEG score recompute
  11. 2026-06-27 19:24 UTCGHSA enrichment
  12. 2026-06-27 15:23 UTCEG score recompute
  13. 2026-06-27 15:23 UTCGHSA enrichment
  14. 2026-06-27 11:12 UTCEG score recompute
  15. 2026-06-27 11:12 UTCGHSA enrichment
  16. 2026-06-27 07:10 UTCEG score recompute
  17. 2026-06-27 07:10 UTCGHSA enrichment
  18. 2026-06-27 03:08 UTCEPSS rescore
  19. 2026-06-26 22:58 UTCEG score recompute
  20. 2026-06-26 22:58 UTCGHSA enrichment
  21. 2026-06-26 18:50 UTCEG score recompute
  22. 2026-06-26 18:50 UTCGHSA enrichment
  23. 2026-06-26 03:00 UTCEG score recompute
  24. 2026-06-26 03:00 UTCGHSA enrichment
  25. 2026-06-25 20:46 UTCEG score recompute
  26. 2026-06-25 20:46 UTCGHSA enrichment
  27. 2026-06-25 16:45 UTCEG score recompute
  28. 2026-06-25 16:45 UTCGHSA enrichment
  29. 2026-06-25 13:49 UTCEPSS rescore
  30. 2026-06-25 12:40 UTCEG score recompute
  31. 2026-06-25 12:40 UTCGHSA enrichment
  32. 2026-06-24 14:05 UTCEPSS rescore
  33. 2026-06-23 21:33 UTCEPSS rescore
  34. 2026-06-23 21:33 UTCEPSS rescore
  35. 2026-06-22 14:25 UTCEPSS rescore
  36. 2026-06-22 14:25 UTCEPSS rescore
  37. 2026-06-21 14:56 UTCEPSS rescore
  38. 2026-06-21 14:56 UTCEPSS rescore
  39. 2026-06-21 01:59 UTCEPSS rescore
  40. 2026-06-21 01:59 UTCEPSS rescore
  41. 2026-06-19 19:26 UTCEPSS rescore
  42. 2026-06-19 19:26 UTCEPSS rescore
  43. 2026-06-18 17:52 UTCEPSS rescore
  44. 2026-06-18 17:52 UTCEPSS rescore
  45. 2026-06-18 03:43 UTCEG score recompute
  46. 2026-06-18 03:42 UTCGHSA enrichment
  47. 2026-06-17 23:40 UTCEG score recompute
  48. 2026-06-17 23:40 UTCGHSA enrichment
  49. 2026-06-17 19:29 UTCEG score recompute
  50. 2026-06-17 19:29 UTCGHSA enrichment
  51. 2026-06-17 17:53 UTCEPSS rescore
  52. 2026-06-17 12:35 UTCEG score recompute
  53. 2026-06-17 12:35 UTCGHSA enrichment
  54. 2026-06-17 08:11 UTCEG score recompute
  55. 2026-06-17 08:11 UTCGHSA enrichment
  56. 2026-06-17 02:54 UTCEG score recompute
  57. 2026-06-17 02:54 UTCGHSA enrichment
  58. 2026-06-16 22:54 UTCEG score recompute
  59. 2026-06-16 22:54 UTCGHSA enrichment
  60. 2026-06-16 18:52 UTCEG score recompute
  61. 2026-06-16 18:52 UTCGHSA enrichment
  62. 2026-06-16 17:53 UTCEPSS rescore
  63. 2026-06-16 10:42 UTCEG score recompute
  64. 2026-06-16 10:42 UTCGHSA enrichment
  65. 2026-06-16 06:38 UTCEG score recompute
  66. 2026-06-16 06:38 UTCGHSA enrichment
  67. 2026-06-16 02:37 UTCEG score recompute
  68. 2026-06-16 02:37 UTCGHSA enrichment
  69. 2026-06-15 22:35 UTCEG score recompute
  70. 2026-06-15 22:34 UTCGHSA enrichment
  71. 2026-06-15 17:49 UTCEPSS rescore
  72. 2026-06-15 17:49 UTCEPSS rescore
  73. 2026-06-15 14:00 UTCEG score recompute
  74. 2026-06-15 13:59 UTCGHSA enrichment
  75. 2026-06-15 06:22 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-48687?
CVE-2026-48687 is a critical vulnerability published on May 26, 2026. FastNetMon Community Edition through 1.2.9 contains an OS command injection vulnerability in the Juniper router integration plugin. The log() function in src/juniperplugin/fastnetmonjuniper.php (lines 117-118) constructs shell commands by concatenating the $msg parameter directly into exec() calls:…
When was CVE-2026-48687 disclosed?
CVE-2026-48687 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on May 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48687 actively exploited?
CVE-2026-48687 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 73.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-48687?
CVE-2026-48687 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-48687?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48687, 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.

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