CVE-2026-77368

HIGHPre-NVD 7.67.6
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 7.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (30th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
7.6EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.6Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

SeaweedFS is a distributed storage system for files and blobs. In version 4.39, the filer's TUS resumable-upload handler checks JWT allowed_prefixes scoping only when a session is created, letting a low-privilege tenant hijack another tenant's upload session to write content to filer paths their own token forbids. The HEAD, PATCH, and DELETE verbs that act on an existing session by its id never verify that the session's stored target path falls within the caller's allowed prefixes, so a tenant who obtains another upload's session identifier can PATCH attacker bytes into it and, on completion, have the file land at the victim's out-of-scope path. The same token can also DELETE other tenants' sessions and HEAD them to read upload progress and size, defeating the JWT prefix isolation. This vulnerability only affects deployments that configure filer JWT signing and have TUS uploads enabled. This issue is fixed in version 4.40.

CVSS v3
7.6
EG Score
7.6HIGHmedium confidence
EG Risk
34
EG Risk 34/100

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 (value × EchelonGraph’s weight)
Severity76% × 45%
The EG Score, 7.6 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 26, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 26, 2026
Fix named in the CVE record. Sources: github, github_commit.
GitHub commit

commit fa549e9c83b7 (seaweedfs/seaweedfs)

Fix landed in seaweedfs/seaweedfs commit fa549e9c83b7 — awaiting tagged release

https://github.com/seaweedfs/seaweedfs/commit/fa549e9c83b7799d512157d728f52052912831af
GitHub commit

commit ce82e3a05708 (seaweedfs/seaweedfs)

Fix landed in seaweedfs/seaweedfs commit ce82e3a05708 — awaiting tagged release

https://github.com/seaweedfs/seaweedfs/commit/ce82e3a057080162a9fba11889157d2255815f71
GitHub advisoryMentions a patch (unverified)

Authenticated Cross-Prefix IDOR in SeaweedFS Filer TUS Handler Enables Arbitrary Write to Tenant-Forbidden Paths · Advisory · seaweedfs/seaweedfs · GitHub

https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-99q7-x53r-6j4g

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 55× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 89 are merged into the row they repeat.

  1. 2026-10-11 19:23 UTCEG score recompute
  2. 2026-10-11 16:39 UTCEG score recompute
  3. 2026-10-11 13:58 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  6. 2026-10-10 06:03 UTCEG score recompute
  7. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  8. 2026-10-09 03:19 UTCEG score recompute
  9. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  10. 2026-10-08 01:45 UTCEG score recompute
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  12. 2026-10-07 03:51 UTCEG score recompute
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  14. 2026-10-06 01:41 UTCEG score recompute
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  16. 2026-10-05 08:33 UTCEG score recompute
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  18. 2026-10-03 16:05 UTCEG score recompute
  19. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  20. 2026-10-03 01:42 UTCEG score recompute
  21. 2026-10-01 22:38 UTCEG score recompute
  22. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  23. 2026-09-30 19:57 UTCEG score recompute
  24. 2026-09-30 06:01 UTCEG score recompute
  25. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.4% · 29th percentile
Show 62 more
  1. 2026-09-29 00:02 UTCEG score recompute
  2. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  3. 2026-09-27 22:18 UTCEG score recompute
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  5. 2026-09-26 20:31 UTCEG score recompute
  6. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  7. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  8. 2026-09-25 00:14 UTCEG score recompute
  9. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  10. 2026-09-23 21:46 UTCEG score recompute
  11. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  12. 2026-09-22 20:04 UTCEG score recompute
  13. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  14. 2026-09-22 07:11 UTCEG score recompute
  15. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  16. 2026-09-21 05:28 UTCEG score recompute
  17. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  18. 2026-09-20 03:29 UTCEG score recompute
  19. 2026-09-19 01:46 UTCEG score recompute
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  21. 2026-09-18 00:04 UTCEG score recompute
  22. 2026-09-16 21:31 UTCEG score recompute
  23. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  24. 2026-09-16 07:44 UTCEG score recompute
  25. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  26. 2026-09-15 05:57 UTCEG score recompute
  27. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  28. 2026-09-14 04:12 UTCEG score recompute
  29. 2026-09-13 02:30 UTCEG score recompute
  30. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  31. 2026-09-12 00:46 UTCEG score recompute
  32. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  33. 2026-09-11 11:54 UTCEG score recompute
  34. 2026-09-10 10:04 UTCEG score recompute
  35. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  36. 2026-09-09 02:20 UTCEG score recompute
  37. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  38. 2026-09-08 00:05 UTCEG score recompute
  39. 2026-09-06 22:19 UTCEG score recompute
  40. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  41. 2026-09-05 20:33 UTCEG score recompute
  42. 2026-09-04 18:50 UTCEG score recompute
  43. 2026-09-04 05:58 UTCEG score recompute
  44. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  45. 2026-09-02 15:10 UTCEG score recompute
  46. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  47. 2026-09-02 02:18 UTCEG score recompute
  48. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  49. 2026-09-01 13:24 UTCEG score recompute
  50. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  51. 2026-08-30 22:49 UTCEG score recompute
  52. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  53. 2026-08-30 09:58 UTCEG score recompute
  54. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  55. 2026-08-29 08:15 UTCEG score recompute
  56. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  57. 2026-08-27 17:30 UTCEG score recompute
  58. 2026-08-27 17:07 UTCEG score recompute
  59. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  60. 2026-08-26 22:24 UTCEG score recompute
  61. 2026-08-26 22:02 UTCEG score recomputeFirst assessed: 7.6 HIGH
  62. 2026-08-26 22:01 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-77368?
CVE-2026-77368 is a high-severity vulnerability; its CVE record was published on August 26, 2026. SeaweedFS is a distributed storage system for files and blobs. In version 4.39, the filer's TUS resumable-upload handler checks JWT allowed_prefixes scoping only when a session is created, letting a low-privilege tenant hijack another tenant's upload session to write content to filer paths their…
When was the CVE record for CVE-2026-77368 published?
The CVE record for CVE-2026-77368 was published on August 26, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-77368 actively exploited?
CVE-2026-77368 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77368?
CVE-2026-77368 has a CVSS base score of 7.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77368?
The CVE record for CVE-2026-77368 names the fix: "This issue is fixed in version 4.40."

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