CVE-2026-19539

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (35th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Authorization Bypass Through User-Controlled Key in the ticket management component in Roskus Prospero Flow CRM before 5.4.9 allows authenticated users of any company to read the full content (title, description, and attachments) of tickets belonging to another company, to hijack another company's tickets by reassigning their company_id, and to delete another company's tickets without any authorization check, via the ticket's numeric identifier, because the read and save operations retrieve the record without constraining the query to the authenticated user's company, and the delete controller type-hints a generic Illuminate\Http\Request instead of the TicketDeleteRequest that would enforce the required permission.

CVSS v3
8.6
EG Score
8.6HIGHmedium confidence
EG Risk
39
EG Risk 39/100CISA 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
Severity86% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 11, 2026

Last Modified

September 1, 2026

Advisory Details (3)

Auto-updated Aug 11, 2026
Patch available. Sources: github_commit, github_release.
generic

CVE-2026-19539 · IDOR in Prospero Flow CRM allows cross-tenant ticket read, hijacking, and deletion | Vulnerabilities published by Secur0

https://secur0.com/en/cna/cve-list/cve-2026-19539-idor-in-prospero-flow-crm-allows-cross-tenant-ticket-read-hijacking-and-deletion
github_release Patch Available

v5.5.3 - Big security upgrade

Patch available: Roskus/prospero-flow-crm v5.5.3

https://github.com/Roskus/prospero-flow-crm/releases/tag/v5.5.3
github_commit Patch Available

commit b2b6ffdace09 (Roskus/prospero-flow-crm)

Patch available: Roskus/prospero-flow-crm v5.5.3 (contains commit b2b6ffdace09)

https://github.com/Roskus/prospero-flow-crm/commit/b2b6ffdace0972ab62d1f7e8cdab0ed213bfc4a9

Vendor Advisories for CVE-2026-19539(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 / 92× 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 189 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-19539?
CVE-2026-19539 is a high vulnerability published on August 11, 2026. Authorization Bypass Through User-Controlled Key in the ticket management component in Roskus Prospero Flow CRM before 5.4.9 allows authenticated users of any company to read the full content (title, description, and attachments) of tickets belonging to another company, to hijack another company's…
When was CVE-2026-19539 disclosed?
CVE-2026-19539 was first published on August 11, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19539 actively exploited?
CVE-2026-19539 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-19539?
CVE-2026-19539 has a CVSS base score of 8.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-19539?
A fix for CVE-2026-19539 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-19539 are linked in the Vendor Advisories panel on this page.

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