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% (33rd 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

Also known asEUVD-2026-66758 (ENISA EUVD)Source: ENISA EUVD

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 impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity76% × 45%
Impact severity (EG Severity): CVSS 7.6 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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
33rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.6): severity, escalated by confirmed exploitation. This CVE's 7.6 is its impact severity (EG Severity), not escalated.

EG Severity
7.6 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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.

The score's inputs: 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 7× in last 7d / 30× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 130 rows on record for this CVE.

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. None are among the latest 100 rows. The 30 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:57 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  2. 2026-11-12 16:38 UTCEchelonGraph re-scored
  3. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  4. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  5. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  6. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  7. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  8. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  9. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  10. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  11. 2026-11-05 03:54 UTCEchelonGraph re-scored
  12. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  13. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  14. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  15. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  16. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  17. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  18. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  19. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  20. 2026-10-28 15:38 UTCEchelonGraph re-scored
  21. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  22. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  23. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  24. 2026-10-25 14:01 UTCEchelonGraph re-scored
  25. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
Show 75 more
  1. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  2. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  3. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  4. 2026-10-20 19:13 UTCEchelonGraph re-scored
  5. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  6. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  7. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  8. 2026-10-18 03:12 UTCEchelonGraph re-scored
  9. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  10. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  11. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  12. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  13. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  14. 2026-10-13 06:58 UTCEchelonGraph re-scored
  15. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  16. 2026-10-12 15:37 UTCEchelonGraph re-scored
  17. 2026-10-11 19:23 UTCEchelonGraph re-scored
  18. 2026-10-11 16:39 UTCEchelonGraph re-scored
  19. 2026-10-11 13:58 UTCEchelonGraph re-scored
  20. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  21. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  22. 2026-10-10 06:03 UTCEchelonGraph re-scored
  23. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  24. 2026-10-09 03:19 UTCEchelonGraph re-scored
  25. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  26. 2026-10-08 01:45 UTCEchelonGraph re-scored
  27. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  28. 2026-10-07 03:51 UTCEchelonGraph re-scored
  29. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  30. 2026-10-06 01:41 UTCEchelonGraph re-scored
  31. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  32. 2026-10-05 08:33 UTCEchelonGraph re-scored
  33. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  34. 2026-10-03 16:05 UTCEchelonGraph re-scored
  35. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  36. 2026-10-03 01:42 UTCEchelonGraph re-scored
  37. 2026-10-01 22:38 UTCEchelonGraph re-scored
  38. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  39. 2026-09-30 19:57 UTCEchelonGraph re-scored
  40. 2026-09-30 06:01 UTCEchelonGraph re-scored
  41. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  42. 2026-09-29 00:02 UTCEchelonGraph re-scored
  43. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  44. 2026-09-27 22:18 UTCEchelonGraph re-scored
  45. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  46. 2026-09-26 20:31 UTCEchelonGraph re-scored
  47. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  48. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  49. 2026-09-25 00:14 UTCEchelonGraph re-scored
  50. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  51. 2026-09-23 21:46 UTCEchelonGraph re-scored
  52. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  53. 2026-09-22 20:04 UTCEchelonGraph re-scored
  54. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  55. 2026-09-22 07:11 UTCEchelonGraph re-scored
  56. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  57. 2026-09-21 05:28 UTCEchelonGraph re-scored
  58. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  59. 2026-09-20 03:29 UTCEchelonGraph re-scored
  60. 2026-09-19 01:46 UTCEchelonGraph re-scored
  61. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  62. 2026-09-18 00:04 UTCEchelonGraph re-scored
  63. 2026-09-16 21:31 UTCEchelonGraph re-scored
  64. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  65. 2026-09-16 07:44 UTCEchelonGraph re-scored
  66. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  67. 2026-09-15 05:57 UTCEchelonGraph re-scored
  68. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  69. 2026-09-14 04:12 UTCEchelonGraph re-scored
  70. 2026-09-13 02:30 UTCEchelonGraph re-scored
  71. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  72. 2026-09-12 00:46 UTCEchelonGraph re-scored
  73. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  74. 2026-09-11 11:54 UTCEchelonGraph re-scored
  75. 2026-09-10 10:04 UTCEchelonGraph re-scored

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 (33rd 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."

Dependency Blast Radius

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