CVE-2026-2991

CRITICALNVD 7.39.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-18. NVD baseline CVSS 7.3; sources differ by 2.5.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: Elevated riskExposed: 0

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

The KiviCare – Clinic & Patient Management System (EHR) plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 4.1.2. This is due to the patientSocialLogin() function not verifying the social provider access token before authenticating a user. This makes it possible for unauthenticated attackers to log in as any patient registered on the system by providing only their email address and an arbitrary value for the access token, bypassing all credential verification. The attacker gains access to sensitive medical records, appointments, prescriptions, and billing information (PII/PHI breach). Additionally, authentication cookies are set before the role check, meaning the auth cookies for non-patient users (including administrators) are also set in the HTTP response headers, even though a 403 response is returned.

CVSS v3
7.3
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

March 18, 2026

Last Modified

June 17, 2026

References (4)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 27× 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 221 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCjoshuavanderpoll/CVE-2026-2991
    First seen Mar 18, 2026

    PoC exploit for CVE-2026-2991 — authentication bypass in KiviCare WordPress plugin (≤4.1.2) allowing unauthenticated patient account takeover and admin session extraction.

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-2991?
CVE-2026-2991 is a critical vulnerability published on March 18, 2026. The KiviCare – Clinic & Patient Management System (EHR) plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 4.1.2. This is due to the patientSocialLogin() function not verifying the social provider access token before authenticating a user. This makes…
When was CVE-2026-2991 disclosed?
CVE-2026-2991 was first published in the National Vulnerability Database on March 18, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-2991 actively exploited?
CVE-2026-2991 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 62.8% of all scored CVEs.
What is the CVSS score of CVE-2026-2991?
CVE-2026-2991 has a CVSS v3 base score of 7.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2026-2991?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-2991, 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

Explore the affected products and dependency analysis for CVE-2026-2991

Explore →

Is Your Infrastructure Affected by CVE-2026-2991?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs