CVE-2026-56243

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-23. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

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

Capgo before 12.128.2 contains a security control bypass vulnerability where the PostgREST/RLS plane accepts plaintext API keys through the capgkey header despite enforce_hashed_api_keys being enabled. Attackers can bypass org-level hashed-key enforcement by sending plaintext API keys directly to the PostgREST/RLS plane to access protected resources.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

June 23, 2026

Last Modified

June 23, 2026

Advisory Details (2)

Auto-updated Jun 23, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Capgo - Hashed API Key Enforcement Bypass via PostgREST/RLS Plane | Advisories | VulnCheck

https://www.vulncheck.com/advisories/capgo-hashed-api-key-enforcement-bypass-via-postgrest-rls-plane
github Patch Available🟡 PoC Available

Enforce_hashed_api_keys can be bypassed on the PostgREST/RLS plane via plaintext capgkey authentication · Advisory · Cap-go/capgo · GitHub

https://github.com/Cap-go/capgo/security/advisories/GHSA-6g74-8cpq-g2c8

Vendor Advisories for CVE-2026-56243(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 5× in last 7d / 59× 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 226 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-56243?
CVE-2026-56243 is a high vulnerability published on June 23, 2026. Capgo before 12.128.2 contains a security control bypass vulnerability where the PostgREST/RLS plane accepts plaintext API keys through the capgkey header despite enforcehashedapi_keys being enabled. Attackers can bypass org-level hashed-key enforcement by sending plaintext API keys directly to the…
When was CVE-2026-56243 disclosed?
CVE-2026-56243 was first published in the National Vulnerability Database on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56243 actively exploited?
CVE-2026-56243 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 68.0% of all scored CVEs.
What is the CVSS score of CVE-2026-56243?
CVE-2026-56243 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-56243?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56243, 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.

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