CVE-2026-56768

HIGHPre-NVD 8.88.8
EchelonGraph scoreMEDIUM confidence

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

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-39520 (ENISA EUVD) · GHSA-w52g-25r7-3c46 (GitHub Security Advisories)Source: ENISA EUVD

8.8EG
EchelonGraph verdictPlan mitigationThe upstream fix is not in a release yet: until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule, then apply it (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 8.8Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Seahub before 13.0.23 does not enforce SHARE_LINK_LOGIN_REQUIRED on GET /api/v2.1/share-link-zip-task/, allowing unauthenticated users to bypass authentication. Attackers with a folder share-link token can call the GET endpoint to obtain a fileserver zip token and download entire shared directory trees.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

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)
Severity88% × 45%
Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.7% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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: An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule, then apply it.
EPSS PROB
0.7%
EPSS %ILE
54th
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 (8.8): severity, escalated by confirmed exploitation. This CVE's 8.8 is its impact severity (EG Severity), not escalated.

EG Severity
8.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-11). 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 low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.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 low or medium mission impact; Track* at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule, then apply it.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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

June 25, 2026

Last Modified

October 25, 2026

Advisory Details (5)

Auto-updated Jun 25, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
Web page

Seahub < 13.0.23 - Authentication Bypass in ShareLinkZipTaskView GET Method | Advisories | VulnCheck

https://www.vulncheck.com/advisories/seahub-authentication-bypass-in-sharelinkziptaskview-get-method
Web page

[Security] SHARE_LINK_LOGIN_REQUIRED bypass on GET /api/v2.1/share-link-zip-task/ · Issue #9050 · haiwen/seahub · GitHub

https://github.com/haiwen/seahub/issues/9050
GitHub commit

commit b609949cf64e (haiwen/seahub)

Fix landed in haiwen/seahub commit b609949cf64e — awaiting tagged release

https://github.com/haiwen/seahub/commit/b609949cf64ed6a15708d0fb5ea9c179962e23cc
GitHub commit

commit 162cddae0831 (haiwen/seahub)

Fix landed in haiwen/seahub commit 162cddae0831 — awaiting tagged release

https://github.com/haiwen/seahub/commit/162cddae0831188d02bb8d451dc2193e197dcc57

Vendor Advisories for CVE-2026-56768(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 8× in last 7d / 36× 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 305 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 205 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:53 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  2. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  3. 2026-11-12 05:35 UTCEchelonGraph re-scored
  4. 2026-11-12 05:35 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  5. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  6. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  7. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  8. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  9. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  10. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  11. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  12. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  13. 2026-11-04 13:20 UTCEchelonGraph re-scored
  14. 2026-11-04 13:20 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  15. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  16. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  17. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  18. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  19. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  20. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  21. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  22. 2026-10-27 21:03 UTCEchelonGraph re-scored
  23. 2026-10-27 21:03 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  24. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  25. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
Show 75 more
  1. 2026-10-25 22:27 UTCEchelonGraph re-scored
  2. 2026-10-25 22:27 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  3. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  4. 2026-10-25 14:18 UTCEchelonGraph re-scored
  5. 2026-10-24 19:10 UTCEchelonGraph re-scored
  6. 2026-10-24 19:10 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  7. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  8. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  9. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  10. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  11. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  12. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  13. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  14. 2026-10-18 03:29 UTCEchelonGraph re-scored
  15. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  16. 2026-10-17 02:53 UTCEchelonGraph re-scored
  17. 2026-10-17 02:53 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  18. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  19. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  20. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  21. 2026-10-13 22:54 UTCOSV refresh
  22. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  23. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  24. 2026-10-12 15:54 UTCEchelonGraph re-scored
  25. 2026-10-11 19:38 UTCEchelonGraph re-scored
  26. 2026-10-11 16:53 UTCEchelonGraph re-scored
  27. 2026-10-11 14:16 UTCEchelonGraph re-scored
  28. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  29. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  30. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  31. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  32. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  33. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  34. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  35. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  36. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  37. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  38. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  39. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  40. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  41. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  42. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  43. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  44. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  45. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  46. 2026-09-23 08:30 UTCEchelonGraph re-scored
  47. 2026-09-23 08:30 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  48. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  49. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  50. 2026-09-18 07:20 UTCEchelonGraph re-scored
  51. 2026-09-18 07:20 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  52. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  53. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  54. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  55. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  56. 2026-09-14 01:17 UTCEchelonGraph re-scored
  57. 2026-09-14 01:17 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  58. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  59. 2026-09-13 09:38 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  60. 2026-09-12 15:43 UTCEchelonGraph re-scored
  61. 2026-09-12 15:43 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  62. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  63. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  64. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  65. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  66. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  67. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  68. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  69. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  70. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  71. 2026-08-30 19:31 UTCEchelonGraph re-scored
  72. 2026-08-30 19:31 UTCGHSA enrichmentGHSA-w52g-25r7-3c46 · GitHub severity HIGH · GitHub CVSS 8.8
  73. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  74. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  75. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.7% · 50th percentile

Frequently asked(5)

What is CVE-2026-56768?
CVE-2026-56768 is a high-severity vulnerability; its CVE record was published on June 25, 2026. Seahub before 13.0.23 does not enforce SHARE_LINK_LOGIN_REQUIRED on GET /api/v2.1/share-link-zip-task/, allowing unauthenticated users to bypass authentication. Attackers with a folder share-link token can call the GET endpoint to obtain a fileserver zip token and download entire shared directory…
When was CVE-2026-56768 made public?
CVE-2026-56768 was made public on May 29, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on June 25, 2026. EchelonGraph's copy of the record carries a last-modified date of October 25, 2026; the record at its source may have been updated since.
Is CVE-2026-56768 actively exploited?
CVE-2026-56768 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56768?
CVE-2026-56768 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56768?
An upstream fix for CVE-2026-56768 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-56768 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-56768

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