CVE-2026-61399

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

Score 4.8 from GitHub Security Advisory published 2026-08-21. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 4.8Exploit: None knownExposed services: Not assessed

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

Improper Encoding or Escaping of Output vulnerability in Apache CloudStack's UI while using Lock User Functionality.

This issue affects Apache CloudStack: from 4.20.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0.

Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.

CVSS v3
4.8
EG Score
4.8MEDIUMmedium confidence
EG Risk
22
EG Risk 22/100CISA SSVC

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%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
41st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 21, 2026

Last Modified

August 27, 2026

Advisory Details (1)

Auto-updated Aug 24, 2026
No fix on record yet.
generic
https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc

Vendor Advisories for CVE-2026-61399(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 19× in last 7d / 72× 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 129 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-61399?
CVE-2026-61399 is a medium vulnerability published on August 21, 2026. Improper Encoding or Escaping of Output vulnerability in Apache CloudStack's UI while using Lock User Functionality. This issue affects Apache CloudStack: from 4.20.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later,…
When was CVE-2026-61399 disclosed?
CVE-2026-61399 was first published on August 21, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-61399 actively exploited?
CVE-2026-61399 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-61399?
CVE-2026-61399 has a CVSS v3.1 base score of 4.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-61399?
No fix for CVE-2026-61399 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-61399 are linked in the Vendor Advisories panel on this page.

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