CVE-2026-56331

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-07-01. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: 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 improper error handling in the /private/accept_invitation endpoint that returns HTTP 500 instead of safe 4xx errors when magic_invite_string is invalid. Attackers can trigger this vulnerability using only the public key by submitting malformed magic_invite_string values to cause server errors and leak internal processing details.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 1, 2026

Advisory Details (2)

Auto-updated Jul 3, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

500 Internal Server Error on /private/accept_invitation when magic_invite_string is invalid (tmp_users “single JSON object” coercion) · Advisory · Cap-go/capgo · GitHub

https://github.com/Cap-go/capgo/security/advisories/GHSA-34p8-fh3m-376x
generic

Capgo - Improper Error Handling in Accept Invitation Endpoint via Invalid Magic String | Advisories | VulnCheck

https://www.vulncheck.com/advisories/capgo-improper-error-handling-in-accept-invitation-endpoint-via-invalid-magic-string

Vendor Advisories for CVE-2026-56331(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 15× in last 7d / 78× 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 138 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56331?
CVE-2026-56331 is a medium vulnerability published on July 1, 2026. Capgo before 12.128.2 contains improper error handling in the /private/acceptinvitation endpoint that returns HTTP 500 instead of safe 4xx errors when magicinvitestring is invalid. Attackers can trigger this vulnerability using only the public key by submitting malformed magicinvite_string values…
When was CVE-2026-56331 disclosed?
CVE-2026-56331 was first published in the National Vulnerability Database on July 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56331 actively exploited?
CVE-2026-56331 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 73.1% of all scored CVEs.
What is the CVSS score of CVE-2026-56331?
CVE-2026-56331 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-56331?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56331, 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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