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: 0.3%, top 75% of all CVEs by exploit prediction. 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%CVSS: 8.6Exploit: None knownExposed: 0

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

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
8.6(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity86% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

August 11, 2026

Last Modified

August 12, 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 29× in last 7d / 41× 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. 2026-08-20 14:16 UTCGHSA enrichment
  2. 2026-08-20 02:43 UTCEG score recompute
  3. 2026-08-20 02:43 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 15:43 UTCGHSA enrichment
  6. 2026-08-19 04:47 UTCGHSA enrichment
  7. 2026-08-18 17:51 UTCEG score recompute
  8. 2026-08-18 17:50 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 06:45 UTCGHSA enrichment
  11. 2026-08-17 19:46 UTCEG score recompute
  12. 2026-08-17 19:45 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 08:45 UTCGHSA enrichment
  15. 2026-08-16 21:49 UTCEG score recompute
  16. 2026-08-16 21:49 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 10:52 UTCEG score recompute
  19. 2026-08-16 10:52 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 23:56 UTCGHSA enrichment
  22. 2026-08-15 12:59 UTCGHSA enrichment
  23. 2026-08-15 02:02 UTCEG score recompute
  24. 2026-08-15 02:02 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
Show 16 more
  1. 2026-08-14 15:05 UTCGHSA enrichment
  2. 2026-08-14 04:09 UTCEG score recompute
  3. 2026-08-14 04:09 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 17:12 UTCGHSA enrichment
  6. 2026-08-13 06:16 UTCGHSA enrichment
  7. 2026-08-12 19:19 UTCEG score recompute
  8. 2026-08-12 19:19 UTCGHSA enrichment
  9. 2026-08-12 18:56 UTCEG score recompute
  10. 2026-08-12 18:56 UTCGHSA enrichment
  11. 2026-08-12 13:50 UTCEPSS rescore
  12. 2026-08-12 12:17 UTCGHSA enrichment
  13. 2026-08-12 01:20 UTCGHSA enrichment
  14. 2026-08-11 14:24 UTCEG score recompute
  15. 2026-08-11 14:03 UTCEG score recompute
  16. 2026-08-11 14:02 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database on August 11, 2026, with the most recent update on August 12, 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% probability of exploitation in the next 30 days, which ranks it in the top 74.9% of all scored CVEs.
What is the CVSS score of CVE-2026-19539?
CVE-2026-19539 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-19539?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19539, 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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