CVE-2026-56309

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-07-10. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: Elevated riskExposed: 0

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

Capgo before 12.128.2 fails to enforce plan/quota restrictions on the /files/upload/attachments endpoint, allowing plan-blocked apps to create publicly readable R2 objects. Attackers can upload arbitrary attachments using upload-scoped API keys that bypass plan checks, persist outside normal bundle metadata, and survive app deletion, enabling storage and bandwidth abuse.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

July 10, 2026

Last Modified

July 10, 2026

Advisory Details (2)

Auto-updated Jul 10, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Plan-blocked apps can still create publicly readable orphaned R2 attachments that survive app deletion · Advisory · Cap-go/capgo · GitHub

https://github.com/Cap-go/capgo/security/advisories/GHSA-q52j-ggvx-cr4v
generic

Capgo - Plan Bypass via Unrestricted Attachment Upload Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/capgo-plan-bypass-via-unrestricted-attachment-upload-endpoint

Vendor Advisories for CVE-2026-56309(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 17× in last 7d / 81× 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 126 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-56309?
CVE-2026-56309 is a medium vulnerability published on July 10, 2026. Capgo before 12.128.2 fails to enforce plan/quota restrictions on the /files/upload/attachments endpoint, allowing plan-blocked apps to create publicly readable R2 objects. Attackers can upload arbitrary attachments using upload-scoped API keys that bypass plan checks, persist outside normal bundle…
When was CVE-2026-56309 disclosed?
CVE-2026-56309 was first published in the National Vulnerability Database on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56309 actively exploited?
CVE-2026-56309 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 71.7% of all scored CVEs.
What is the CVSS score of CVE-2026-56309?
CVE-2026-56309 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-56309?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56309, 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

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