CVE-2026-52837

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% (45th 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
Elevated
6.9EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.9Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Easy!Appointments is a self hosted appointment scheduler. In versions up to and including 1.5.2, the booking reschedule view at /index.php/booking/reschedule/{appointment_hash} (handled by Booking::index()) embeds the entire customer record as inline JavaScript (const vars = {... "customer_data": {...}, ...}) without authentication and without field whitelisting. Anyone in possession of the 12-character appointment_hash — which appears in plain text in reschedule emails, confirmation page URLs, and operator-side calendar links — can read every column of that customer's row in the ea_users table. Version 1.6.0 contains a patch.

CVSS v3
6.9
EG Score
6.9MEDIUMmedium confidence
EG Risk
62
EG Risk 62/100

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.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
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 public PoC (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
45th
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 public PoC (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 14, 2026

Last Modified

July 29, 2026

Advisory Details (2)

Auto-updated Jul 14, 2026
Patch available. Sources: github, github_commit.
GitHub advisoryMentions a patch (unverified)

Unauthenticated customer PII disclosure on booking reschedule page · Advisory · alextselegidis/easyappointments · GitHub

https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-xgr6-pqjv-3pf8
GitHub commit Patch Available

commit 629a0415f54f (alextselegidis/easyappointments)

Patch available: alextselegidis/easyappointments 1.6.0 (contains commit 629a0415f54f)

https://github.com/alextselegidis/easyappointments/commit/629a0415f54f75556c17f4f5d9c77fda1fdbdeae

Vendor Advisories for CVE-2026-52837(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
composeralextselegidis/easyappointments—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
alextselegidis/easyappointments1.1.0 ... 1.5.2 (24 versions)
  • every version through 1.5.2: no fix on record
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 38× 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 167 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 67 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  3. 2026-10-12 15:58 UTCEG score recompute
  4. 2026-10-11 19:41 UTCEG score recompute
  5. 2026-10-11 16:56 UTCEG score recompute
  6. 2026-10-11 14:19 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  18. 2026-10-01 13:24 UTCEG score recompute
  19. 2026-10-01 13:24 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  21. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  23. 2026-09-28 09:22 UTCEG score recompute
  24. 2026-09-28 09:22 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  25. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 44th percentile
Show 75 more
  1. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  2. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  3. 2026-09-24 09:54 UTCEG score recompute
  4. 2026-09-24 09:54 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  5. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  6. 2026-09-23 03:57 UTCEG score recompute
  7. 2026-09-23 03:57 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  8. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  9. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  10. 2026-09-18 04:55 UTCEG score recompute
  11. 2026-09-18 04:55 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  12. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  13. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  14. 2026-09-14 09:24 UTCEG score recompute
  15. 2026-09-14 09:24 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  16. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  17. 2026-09-13 07:55 UTCEG score recompute
  18. 2026-09-13 07:55 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  19. 2026-09-12 01:46 UTCEG score recompute
  20. 2026-09-12 01:46 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  21. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  22. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  23. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  24. 2026-09-08 01:47 UTCEG score recompute
  25. 2026-09-08 01:47 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  26. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  27. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  28. 2026-09-05 21:18 UTCEG score recompute
  29. 2026-09-05 21:18 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  30. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  31. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  32. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  33. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  34. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  35. 2026-08-30 05:25 UTCEG score recompute
  36. 2026-08-30 05:25 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  37. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  38. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  39. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  40. 2026-08-27 13:53 UTCEG score recompute
  41. 2026-08-27 13:53 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  42. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  43. 2026-08-26 12:15 UTCEG score recompute
  44. 2026-08-26 12:15 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  45. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  46. 2026-08-25 09:14 UTCEG score recompute
  47. 2026-08-25 09:14 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  48. 2026-08-24 06:39 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  49. 2026-08-23 05:09 UTCEG score recompute
  50. 2026-08-23 05:09 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  51. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  52. 2026-08-22 03:40 UTCEG score recompute
  53. 2026-08-22 03:40 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  54. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  55. 2026-08-21 02:10 UTCEG score recompute
  56. 2026-08-21 02:10 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  57. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  58. 2026-08-20 00:40 UTCEG score recompute
  59. 2026-08-20 00:40 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  60. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  61. 2026-08-18 23:08 UTCEG score recompute
  62. 2026-08-18 23:08 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  63. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  64. 2026-08-17 21:39 UTCEG score recompute
  65. 2026-08-17 21:39 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  66. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  67. 2026-08-16 19:31 UTCEG score recompute
  68. 2026-08-16 19:31 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  69. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  70. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  71. 2026-08-15 17:33 UTCEG score recompute
  72. 2026-08-15 17:33 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8
  73. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  74. 2026-08-14 16:03 UTCEG score recompute
  75. 2026-08-14 16:03 UTCGHSA enrichmentGHSA-xgr6-pqjv-3pf8

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-52837?
CVE-2026-52837 is a medium-severity vulnerability; its CVE record was published on July 14, 2026. Easy!Appointments is a self hosted appointment scheduler. In versions up to and including 1.5.2, the booking reschedule view at /index.php/booking/reschedule/{appointmenthash} (handled by Booking::index()) embeds the entire customer record as inline JavaScript (const vars = {... "customerdata":…
When was the CVE record for CVE-2026-52837 published?
The CVE record for CVE-2026-52837 was published on July 14, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 29, 2026; the record at its source may have been updated since.
Is CVE-2026-52837 actively exploited?
CVE-2026-52837 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-52837?
CVE-2026-52837 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-2026-52837?
A fix for CVE-2026-52837 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-52837 are linked in the Vendor Advisories panel on this page.

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