CVE-2026-52840

LOWPre-NVD 2.72.7
EchelonGraph scoreMEDIUM confidence

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

Score 2.7 from GitHub Security Advisory (severity: LOW) published 2026-07-29. A secondary CVSS source baseline 2.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Elevated
2.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (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: 0.3%CVSS: 2.7Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, Caldav::connect_to_server at application/controllers/Caldav.php:60 hands the request's caldav_url to a Guzzle REPORT call without scheme or host validation. A logged-in backend user (admin, provider, or secretary) reaches loopback, RFC1918, and link-local hosts on the deployment's network. The Guzzle exception path returns the upstream status code plus ~120 bytes of response body in the JSON message field (Caldav.php:74-78), so the SSRF is semi-blind. Version 1.6.0 contains a patch.

CVSS v3
2.7
EG Score
2.7LOWmedium confidence
EG Risk
28
EG Risk 28/100

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)
Severity27% × 45%
The EG Score, 2.7 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (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: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
22nd
KEV
Not listed

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

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (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 15, 2026

References (2)

Vendor Advisories for CVE-2026-52840(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(1)

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

Data Freshness Timeline

(refreshed 11× 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 122 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 22 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 0.3% · 22nd percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 22nd 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 0.3% · 22nd percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  18. 2026-10-01 13:23 UTCEG score recompute
  19. 2026-10-01 13:23 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  21. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  23. 2026-09-28 09:20 UTCEG score recompute
  24. 2026-09-28 09:20 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  25. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
Show 75 more
  1. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  3. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  4. 2026-09-23 03:55 UTCEG score recompute
  5. 2026-09-23 03:55 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  6. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  7. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  8. 2026-09-18 04:54 UTCEG score recompute
  9. 2026-09-18 04:54 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  10. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  12. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  13. 2026-09-12 01:46 UTCEG score recompute
  14. 2026-09-12 01:46 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  15. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  16. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  17. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  18. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  19. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  20. 2026-09-05 21:17 UTCEG score recompute
  21. 2026-09-05 21:17 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  22. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  23. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  24. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  25. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  26. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  27. 2026-08-30 05:24 UTCEG score recompute
  28. 2026-08-30 05:24 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  29. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  30. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  31. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  32. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  33. 2026-08-26 07:33 UTCEG score recompute
  34. 2026-08-26 07:32 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  35. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  36. 2026-08-23 11:54 UTCEG score recompute
  37. 2026-08-23 11:54 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  38. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  39. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  40. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  41. 2026-08-20 16:53 UTCEG score recompute
  42. 2026-08-20 16:53 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  43. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  44. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  45. 2026-08-17 21:29 UTCEG score recompute
  46. 2026-08-17 21:29 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  47. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  48. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  49. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  50. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  51. 2026-08-15 00:56 UTCEG score recompute
  52. 2026-08-15 00:56 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  53. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  54. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  55. 2026-08-12 05:55 UTCEG score recompute
  56. 2026-08-12 05:55 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  57. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  58. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  59. 2026-08-09 10:54 UTCEG score recompute
  60. 2026-08-09 10:54 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  61. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  62. 2026-08-06 15:52 UTCEG score recompute
  63. 2026-08-06 15:52 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  64. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  65. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  66. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  67. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  68. 2026-08-03 20:52 UTCEG score recompute
  69. 2026-08-03 20:52 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  70. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  71. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  72. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  73. 2026-08-01 01:50 UTCEG score recompute
  74. 2026-08-01 01:50 UTCGHSA enrichmentGHSA-pm5p-7w5h-jm5q · GitHub severity LOW · GitHub CVSS 2.7
  75. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.2% · 8th percentile

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Frequently asked(5)

What is CVE-2026-52840?
CVE-2026-52840 is a low-severity vulnerability; its CVE record was published on July 14, 2026. Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, Caldav::connecttoserver at application/controllers/Caldav.php:60 hands the request's caldav_url to a Guzzle REPORT call without scheme or host validation. A logged-in backend user (admin, provider, or secretary)…
When was the CVE record for CVE-2026-52840 published?
The CVE record for CVE-2026-52840 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 15, 2026; the record at its source may have been updated since.
Is CVE-2026-52840 actively exploited?
CVE-2026-52840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-52840?
CVE-2026-52840 has a CVSS base score of 2.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-52840?
The CVE record for CVE-2026-52840 names the fix: "Version 1.6.0 contains a patch." The vendor advisories EchelonGraph has for CVE-2026-52840 are linked in the Vendor Advisories panel on this page.

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