CVE-2026-47754

CRITICALPre-NVD 9.39.3
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (41st 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-2026-55673 (ENISA EUVD)Source: ENISA EUVD

9.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Metacat is data repository software that helps researchers preserve, share, and discover data. Versions 2.x through 2.19.1 and all 1.x versions contain an unauthenticated path traversal in the archiveEntryName parameter of the action=read endpoint that is part of the original 1.x Metacat API. ArchiveHandler.readArchiveEntry() concatenates the user-supplied parameter into a filesystem path without validation, and the surrounding hasReadPermission() check is commented out. An unauthenticated remote attacker can read any file accessible to the Tomcat process by sending a single GET request. Proof-of-concept exploits have been demonstrated and verified against this vulnerability, and it should be considered easily exploitable for any Metacat deployment < 3.0.0 by any user with access to the 1.x API. Through this vulnerability, production 2.x deployments are exposed to credential theft, client certificate and private key exfiltration enabling member node impersonation within the federation, embargoed research data disclosure, and broad system reconnaissance. Given Metacat's deployment footprint across the DataONE network of repositories and federally funded research programs, the population of exposed 2.x instances is non-trivial. The vulnerability was eliminated in Metacat version 3.0.0 and after by eliminating the entire Metacat 1.x API that exposed this vulnerability. The vulnerability was remediated in April 2024 with the release of Metacat 3.0.0, which removed the legacy Metacat API including ArchiveHandler.java. The commit message and issue reference architectural cleanup, not a security fix, and no advisory or CVE was issued. The 2.x branch was not and will not be backported, as is standard practice in Metacat, which only supports the most current release. 2.19.1 remains vulnerable with identical code and is beyond its supported lifetime. As a workaround, disable or restrict 1.x API servlets. Because the vulnerable 1.x API is no longer used or necessary in most Metacat deployments, restricting access to the old API endpoints can reduce or eliminate exposure for 2.19.x deployments. After removing those features, restart Tomcat or whichever software is hosting the servlets.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
57
EG Risk 57/100

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)
Severity93% × 45%
Impact severity (EG Severity): CVSS 9.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
41st
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 (9.3): severity, escalated by confirmed exploitation. This CVE's 9.3 is its impact severity (EG Severity), not escalated.

EG Severity
9.3 CRITICALCVSS-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
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). 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; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days 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 low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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 10, 2026

Last Modified

October 23, 2026

Advisory Details (4)

Auto-updated Oct 3, 2026
Patch available. Sources: github_pr, github, github_commit.
GitHub advisoryMentions a patch (unverified)

unauthenticated path traversal in Metacat 2.x · Advisory · NCEAS/metacat · GitHub

https://github.com/NCEAS/metacat/security/advisories/GHSA-m852-f287-7cgw
GitHub pull request Patch Available

Feature 1365 remove metacat api tables

Patch available: NCEAS/metacat 3.0.0 (PR #1713 merged 2023-10-31)

https://github.com/NCEAS/metacat/pull/1713
Web page

Remove old Metacat API and associated tables · Issue #1365 · NCEAS/metacat · GitHub

https://github.com/NCEAS/metacat/issues/1365
GitHub commit Patch Available

commit 07e034b2bbf7 (NCEAS/metacat)

Patch available: NCEAS/metacat 3.0.0 (contains commit 07e034b2bbf7)

https://github.com/NCEAS/metacat/commit/07e034b2bbf7029e28af32f472f4d70ea6b5ab1b

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 60× 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.

Showing the most recent 100 of 153 refreshes 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 53 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 01:37 UTCEG score recompute
  2. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-11-01 01:44 UTCEG score recompute
  4. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
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  6. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
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  8. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
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  10. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
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  12. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
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  14. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-25 22:19 UTCEG score recompute
  16. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-10-25 14:24 UTCEG score recompute
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  19. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-10-23 20:27 UTCEG score recompute
  21. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-10-23 14:44 UTCEG score recompute
  23. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-10-22 14:47 UTCEG score recompute
  25. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
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  1. 2026-10-21 14:51 UTCEG score recompute
  2. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-10-20 14:59 UTCEG score recompute
  4. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  5. 2026-10-19 14:50 UTCEG score recompute
  6. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  7. 2026-10-18 03:35 UTCEG score recompute
  8. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  9. 2026-10-17 15:03 UTCEG score recompute
  10. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-10-16 15:09 UTCEG score recompute
  12. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  13. 2026-10-15 15:15 UTCEG score recompute
  14. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-10-14 09:39 UTCEG score recompute
  16. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  17. 2026-10-13 07:23 UTCEG score recompute
  18. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-10-12 16:01 UTCEG score recompute
  20. 2026-10-11 19:44 UTCEG score recompute
  21. 2026-10-11 16:59 UTCEG score recompute
  22. 2026-10-11 14:23 UTCEG score recompute
  23. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  26. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  27. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  28. 2026-10-06 18:21 UTCEG score recompute
  29. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  30. 2026-10-05 18:23 UTCEG score recompute
  31. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  32. 2026-10-05 07:48 UTCEG score recompute
  33. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  34. 2026-10-04 04:26 UTCEG score recompute
  35. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  36. 2026-10-03 00:52 UTCEG score recompute
  37. 2026-10-02 09:19 UTCEG score recompute
  38. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  39. 2026-09-30 22:36 UTCEG score recompute
  40. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  41. 2026-09-29 05:22 UTCEG score recompute
  42. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  43. 2026-09-27 16:56 UTCEG score recompute
  44. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  45. 2026-09-27 12:45 UTCEG score recompute
  46. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  47. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  48. 2026-09-25 04:01 UTCEG score recompute
  49. 2026-09-23 21:10 UTCEG score recompute
  50. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  51. 2026-09-22 15:09 UTCEG score recompute
  52. 2026-09-21 22:09 UTCEG score recompute
  53. 2026-09-21 01:57 UTCEG score recompute
  54. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  55. 2026-09-19 17:22 UTCEG score recompute
  56. 2026-09-18 22:14 UTCEG score recompute
  57. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  58. 2026-09-18 00:49 UTCEG score recompute
  59. 2026-09-17 00:45 UTCEG score recompute
  60. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  61. 2026-09-16 06:43 UTCEG score recompute
  62. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  63. 2026-09-15 06:31 UTCEG score recompute
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  65. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  66. 2026-09-12 16:46 UTCEG score recompute
  67. 2026-09-11 18:23 UTCEG score recompute
  68. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  69. 2026-09-11 14:11 UTCEG score recompute
  70. 2026-09-10 12:36 UTCEG score recompute
  71. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  72. 2026-09-09 05:51 UTCEG score recompute
  73. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  74. 2026-09-07 17:17 UTCEG score recompute
  75. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile

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Frequently asked(5)

What is CVE-2026-47754?
CVE-2026-47754 is a critical-severity vulnerability; its CVE record was published on August 10, 2026. Metacat is data repository software that helps researchers preserve, share, and discover data. Versions 2.x through 2.19.1 and all 1.x versions contain an unauthenticated path traversal in the archiveEntryName parameter of the action=read endpoint that is part of the original 1.x Metacat API.…
When was the CVE record for CVE-2026-47754 published?
The CVE record for CVE-2026-47754 was published on August 10, 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 October 23, 2026; the record at its source may have been updated since.
Is CVE-2026-47754 actively exploited?
CVE-2026-47754 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-47754?
CVE-2026-47754 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-47754?
A fix for CVE-2026-47754 is available: update to the fixed version the vendor names in its advisory.

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