CVE-2026-55418

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 60% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.6Exploit: None knownExposed: 0

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

FastGPT is an open source AI knowledge base platform. Prior to v4.15.0-beta5, two FastGPT file handlers authorize an unrelated resource and then sign or read an S3 object using a key taken directly from the request, without checking that the key belongs to the caller's team. Because S3 object keys are global within the bucket and carry the tenant id only as a path segment, an attacker can supply another team's key and obtain its file contents through the chat-file presign endpoint or dataset preview endpoint. This issue is fixed in version v4.15.0-beta5.

CVSS v3
8.6
EG Score
8.6(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity86% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

July 7, 2026

Last Modified

July 9, 2026

Advisory Details (4)

Auto-updated Jul 7, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit, github_pr.
github Patch Available🟡 PoC Available

S3 presign/read handlers do not bind the object key to the caller's team (cross-team file disclosure) · Advisory · labring/FastGPT · GitHub

https://github.com/labring/FastGPT/security/advisories/GHSA-6rxv-p43w-mmx5
github_release Patch Available

v4.15.0-beta5

Patch available: labring/FastGPT v4.15.0-beta5 (pre-release)

https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5
github_pr Patch Available

fix: bind S3 object keys to authorized resources

Patch available: labring/FastGPT v4.15.0-beta5 (PR #7104 merged 2026-06-12)

https://github.com/labring/FastGPT/pull/7104
github_commit Patch Available

commit decb6d2fb141 (labring/FastGPT)

Patch available: labring/FastGPT v4.15.0-beta5 (contains commit decb6d2fb141)

https://github.com/labring/FastGPT/commit/decb6d2fb1417fb9e2bca145d2dcc9cbcf06396c

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 56× 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.

  1. 2026-08-27 21:54 UTCEG score recompute
  2. 2026-08-27 14:25 UTCEPSS rescore
  3. 2026-08-27 01:52 UTCEG score recompute
  4. 2026-08-26 14:46 UTCEPSS rescore
  5. 2026-08-26 12:57 UTCEG score recompute
  6. 2026-08-25 13:49 UTCEPSS rescore
  7. 2026-08-24 22:17 UTCEG score recompute
  8. 2026-08-24 09:48 UTCEG score recompute
  9. 2026-08-23 06:40 UTCEG score recompute
  10. 2026-08-23 00:19 UTCEPSS rescore
  11. 2026-08-22 05:40 UTCEG score recompute
  12. 2026-08-21 23:49 UTCEPSS rescore
  13. 2026-08-21 04:10 UTCEG score recompute
  14. 2026-08-20 22:55 UTCEPSS rescore
  15. 2026-08-20 02:10 UTCEG score recompute
  16. 2026-08-19 17:04 UTCEPSS rescore
  17. 2026-08-18 20:47 UTCEG score recompute
  18. 2026-08-18 13:48 UTCEPSS rescore
  19. 2026-08-17 15:01 UTCEG score recompute
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-17 02:32 UTCEG score recompute
  22. 2026-08-16 14:56 UTCEPSS rescore
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  24. 2026-08-16 02:14 UTCEPSS rescore
  25. 2026-08-15 13:05 UTCEG score recompute
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  1. 2026-08-15 01:30 UTCEPSS rescore
  2. 2026-08-13 23:38 UTCEG score recompute
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-12 22:38 UTCEG score recompute
  5. 2026-08-12 13:51 UTCEPSS rescore
  6. 2026-08-11 21:40 UTCEG score recompute
  7. 2026-08-11 09:11 UTCEG score recompute
  8. 2026-08-11 00:00 UTCEPSS rescore
  9. 2026-08-09 19:45 UTCEG score recompute
  10. 2026-08-09 13:46 UTCEPSS rescore
  11. 2026-08-08 18:48 UTCEG score recompute
  12. 2026-08-08 16:37 UTCEPSS rescore
  13. 2026-08-07 17:51 UTCEG score recompute
  14. 2026-08-06 16:53 UTCEG score recompute
  15. 2026-08-06 13:47 UTCEPSS rescore
  16. 2026-08-06 04:24 UTCEG score recompute
  17. 2026-08-05 19:17 UTCEPSS rescore
  18. 2026-08-05 02:51 UTCEG score recompute
  19. 2026-08-04 15:10 UTCEPSS rescore
  20. 2026-08-04 14:22 UTCEG score recompute
  21. 2026-08-04 10:39 UTCEPSS rescore
  22. 2026-08-03 13:24 UTCEG score recompute
  23. 2026-08-03 10:36 UTCEPSS rescore
  24. 2026-08-02 12:27 UTCEG score recompute
  25. 2026-08-02 02:27 UTCEPSS rescore
  26. 2026-08-01 11:29 UTCEG score recompute
  27. 2026-08-01 04:16 UTCEPSS rescore
  28. 2026-07-30 21:55 UTCEG score recompute
  29. 2026-07-30 16:28 UTCEPSS rescore
  30. 2026-07-30 08:25 UTCEG score recompute
  31. 2026-07-30 01:30 UTCEPSS rescore
  32. 2026-07-28 17:16 UTCEG score recompute
  33. 2026-07-28 15:37 UTCEPSS rescore
  34. 2026-07-27 15:42 UTCEG score recompute
  35. 2026-07-27 01:02 UTCEG score recompute
  36. 2026-07-26 14:54 UTCEPSS rescore
  37. 2026-07-26 12:34 UTCEG score recompute
  38. 2026-07-25 14:18 UTCEPSS rescore
  39. 2026-07-24 14:18 UTCEPSS rescore
  40. 2026-07-23 14:18 UTCEPSS rescore
  41. 2026-07-23 03:20 UTCEG score recompute
  42. 2026-07-22 14:08 UTCEPSS rescore
  43. 2026-07-21 15:25 UTCEPSS rescore
  44. 2026-07-20 17:08 UTCEPSS rescore
  45. 2026-07-19 14:31 UTCEPSS rescore
  46. 2026-07-19 14:31 UTCEPSS rescore
  47. 2026-07-19 02:29 UTCEPSS rescore
  48. 2026-07-18 10:04 UTCEPSS rescore
  49. 2026-07-16 17:03 UTCEPSS rescore
  50. 2026-07-15 16:57 UTCEPSS rescore
  51. 2026-07-15 16:57 UTCEPSS rescore
  52. 2026-07-15 02:00 UTCEPSS rescore
  53. 2026-07-15 02:00 UTCEPSS rescore
  54. 2026-07-13 22:31 UTCEPSS rescore
  55. 2026-07-13 06:13 UTCEPSS rescore
  56. 2026-07-13 06:13 UTCEPSS rescore
  57. 2026-07-12 05:46 UTCEPSS rescore
  58. 2026-07-11 08:27 UTCEPSS rescore
  59. 2026-07-11 08:27 UTCEPSS rescore
  60. 2026-07-09 19:10 UTCEPSS rescore
  61. 2026-07-09 19:10 UTCEPSS rescore
  62. 2026-07-08 15:16 UTCEPSS rescore
  63. 2026-07-08 15:16 UTCEPSS rescore
  64. 2026-07-07 21:37 UTCEG score recompute
  65. 2026-07-07 21:37 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55418?
CVE-2026-55418 is a high vulnerability published on July 7, 2026. FastGPT is an open source AI knowledge base platform. Prior to v4.15.0-beta5, two FastGPT file handlers authorize an unrelated resource and then sign or read an S3 object using a key taken directly from the request, without checking that the key belongs to the caller's team. Because S3 object keys…
When was CVE-2026-55418 disclosed?
CVE-2026-55418 was first published in the National Vulnerability Database on July 7, 2026, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55418 actively exploited?
CVE-2026-55418 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 60.5% of all scored CVEs.
What is the CVSS score of CVE-2026-55418?
CVE-2026-55418 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-55418?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55418, 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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