CVE-2026-59234

MEDIUMPre-NVD 6.96.9
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (49th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
6.9EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Fixed versions, as the CVE record's CNA (Secur0) states them: "Upgrade to version 5.5.3 or higher."

Authorization Bypass Through User-Controlled Key (CWE-639) in CalendarDeleteEventController (app/Http/Controllers/Calendar/CalendarDeleteEventController.php), exposed at GET /calendar/event/delete/{id}, in Prospero Flow CRM before 5.5.3 allows a remote, authenticated attacker to delete arbitrary calendar events belonging to other users by manipulating the {id} path parameter, because the delete handler resolves the record with Calendar::find($id)->delete() and performs no ownership check (no user_id/company_id scoping) before deletion. This results in unauthorized destruction of other users' calendar events across the platform.

CVSS v3
6.9
EG Score
6.9MEDIUMmedium confidence
EG Risk
46
EG Risk 46/100

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 (value × EchelonGraph’s weight)
Severity69% × 45%
The EG Score, 6.9 of 10.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
49th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 3, 2026

Last Modified

July 6, 2026

Advisory Details (3)

Auto-updated Jul 3, 2026
Patch available. Sources: github_commit, github_release.
Web page

CVE-2026-59234 · IDOR in Prospero Flow CRM allows deletion of other users' calendar events | Vulnerabilities published by Secur0

https://secur0.com/en/cna/cve-list/cve-2026-59234-idor-in-prospero-flow-crm-allows-deletion-of-other-users-calendar-events
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 8c26eed4d805 (Roskus/prospero-flow-crm)

Patch available: Roskus/prospero-flow-crm v5.5.3 (contains commit 8c26eed4d805)

https://github.com/Roskus/prospero-flow-crm/commit/8c26eed4d80544c30e55448e12a8e999af6d2b70

Vendor Advisories for CVE-2026-59234(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 10× in last 7d / 36× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 201 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 101 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:36 UTCEG score recompute
  2. 2026-10-11 16:51 UTCEG score recompute
  3. 2026-10-11 14:14 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  6. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  7. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  8. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  9. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  10. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  11. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  12. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  14. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  15. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  16. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  17. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  18. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  19. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  20. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  21. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  22. 2026-09-23 06:35 UTCEG score recompute
  23. 2026-09-23 06:35 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  24. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  25. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 49th percentile
Show 75 more
  1. 2026-09-18 06:12 UTCEG score recompute
  2. 2026-09-18 06:12 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  3. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  4. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  5. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  6. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  7. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  8. 2026-09-13 12:15 UTCEG score recompute
  9. 2026-09-13 12:15 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  10. 2026-09-12 14:04 UTCEG score recompute
  11. 2026-09-12 14:04 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  12. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  14. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  15. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  16. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  17. 2026-09-05 23:47 UTCEG score recompute
  18. 2026-09-05 23:47 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  19. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  20. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  21. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  22. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  23. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  24. 2026-08-30 11:19 UTCEG score recompute
  25. 2026-08-30 11:19 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  26. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  27. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  28. 2026-08-28 02:45 UTCEG score recompute
  29. 2026-08-28 02:45 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  30. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  31. 2026-08-27 03:12 UTCEG score recompute
  32. 2026-08-27 03:12 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  33. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  34. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  35. 2026-08-24 20:53 UTCEG score recompute
  36. 2026-08-24 20:53 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  37. 2026-08-23 20:36 UTCEG score recompute
  38. 2026-08-23 20:36 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  39. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  40. 2026-08-22 22:26 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  41. 2026-08-22 00:15 UTCEG score recompute
  42. 2026-08-22 00:15 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  43. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  44. 2026-08-21 02:05 UTCEG score recompute
  45. 2026-08-21 02:05 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  46. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  47. 2026-08-20 03:54 UTCEG score recompute
  48. 2026-08-20 03:54 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  49. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  50. 2026-08-18 20:58 UTCEG score recompute
  51. 2026-08-18 20:58 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  52. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  53. 2026-08-17 22:48 UTCEG score recompute
  54. 2026-08-17 22:48 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  55. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  56. 2026-08-16 22:11 UTCEG score recompute
  57. 2026-08-16 22:11 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  58. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  59. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  60. 2026-08-16 00:01 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  61. 2026-08-15 01:50 UTCEG score recompute
  62. 2026-08-15 01:50 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  63. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  64. 2026-08-14 03:40 UTCEG score recompute
  65. 2026-08-14 03:40 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  66. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  67. 2026-08-13 05:31 UTCEG score recompute
  68. 2026-08-13 05:31 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  69. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  70. 2026-08-12 07:21 UTCEG score recompute
  71. 2026-08-12 07:21 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  72. 2026-08-11 09:08 UTCEG score recompute
  73. 2026-08-11 09:08 UTCGHSA enrichmentGHSA-q2f8-hpwm-236j
  74. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  75. 2026-08-10 10:59 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59234?
CVE-2026-59234 is a medium-severity vulnerability; its CVE record was published on July 3, 2026. Authorization Bypass Through User-Controlled Key (CWE-639) in CalendarDeleteEventController (app/Http/Controllers/Calendar/CalendarDeleteEventController.php), exposed at GET /calendar/event/delete/{id}, in Prospero Flow CRM before 5.5.3 allows a remote, authenticated attacker to delete arbitrary…
When was CVE-2026-59234 made public?
CVE-2026-59234 was made public on July 2, 2026: that is the date its CVE record's CNA, Secur0, gives for when the vulnerability was made public. The CVE record itself was published on July 3, 2026. EchelonGraph's copy of the record carries a last-modified date of July 6, 2026; the record at its source may have been updated since.
Is CVE-2026-59234 actively exploited?
CVE-2026-59234 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59234?
CVE-2026-59234 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59234?
A fix for CVE-2026-59234 is available: update to the fixed version the vendor names in its advisory. Fixed versions, as the CVE record's CNA (Secur0) states them: "Upgrade to version 5.5.3 or higher." The vendor advisories EchelonGraph has for CVE-2026-59234 are linked in the Vendor Advisories panel on this page.

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