CVE-2026-57856

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 2026-07-14. The CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
Elevated
8.8EG
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).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 8.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Cockpit CMS contains a path traversal vulnerability in the Bucket file storage API (/system/buckets/api). The api() method in modules/System/Controller/Buckets.php sanitizes the bucket name with preg_replace('/[^a-zA-Z0-9-_\\.]/','', $bucket), which permits '..' and '../' sequences. The sanitized value is interpolated into a Flysystem path as uploads://buckets/{bucket}. Flysystem's WhitespacePathNormalizer resolves 'buckets/..' to the empty string (the uploads storage root) without raising PathTraversalDetected because the '..' has a preceding component to consume. An authenticated low-privileged user can send a crafted request with a '../' bucket name to list, upload, and delete files across all buckets, including those belonging to other users or roles

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
56
EG Risk 56/100

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)
Severity88% × 45%
The EG Score, 8.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (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: 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
0.6%
EPSS %ILE
47th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

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

Exploitation public PoC (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.

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

July 13, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated Jul 14, 2026
Patch available. Sources: github_commit.
Web page

Cockpit CMS Path Traversal via Bucket Name in Bucket File Storage API | Advisories | VulnCheck

https://www.vulncheck.com/advisories/cockpit-cms-path-traversal-via-bucket-name-in-bucket-file-storage-api
Web page

Cockpit CMS Missing Authorization in Bucket File Storage API | Advisories | VulnCheck

https://www.vulncheck.com/advisories/cockpit-cms-missing-authorization-in-bucket-file-storage-api
Web page

GitHub - Cockpit-HQ/Cockpit: Cockpit Core - Content Platform · GitHub

https://github.com/cockpit-hq/cockpit
GitHub commit Patch Available

commit dde2d1d74f5f (Cockpit-HQ/Cockpit)

Patch available: Cockpit-HQ/Cockpit 2.14.0 (contains commit dde2d1d74f5f)

https://github.com/Cockpit-HQ/Cockpit/commit/dde2d1d74f5f4e11de42a298918ea8c9684f932c
Web page

cockpit-cms-security-advisory-2026.md · GitHub

https://gist.github.com/sermikr0/821c4edd3c34e98a62a50b07707785bd

Vendor Advisories for CVE-2026-57856(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 11× in last 7d / 40× 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 219 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 119 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  3. 2026-10-12 15:53 UTCEG score recompute
  4. 2026-10-11 19:37 UTCEG score recompute
  5. 2026-10-11 16:52 UTCEG score recompute
  6. 2026-10-11 14:15 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  18. 2026-10-01 13:51 UTCEG score recompute
  19. 2026-10-01 13:51 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  21. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  23. 2026-09-28 09:27 UTCEG score recompute
  24. 2026-09-28 09:27 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  25. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 46th percentile
Show 75 more
  1. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  2. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  3. 2026-09-24 10:01 UTCEG score recompute
  4. 2026-09-24 10:01 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  5. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  6. 2026-09-23 04:16 UTCEG score recompute
  7. 2026-09-23 04:16 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  8. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  9. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  10. 2026-09-18 05:00 UTCEG score recompute
  11. 2026-09-18 05:00 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  12. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  13. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  15. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  16. 2026-09-13 23:30 UTCEG score recompute
  17. 2026-09-13 23:30 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  18. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  19. 2026-09-13 07:57 UTCEG score recompute
  20. 2026-09-13 07:57 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  21. 2026-09-12 14:39 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  22. 2026-09-12 01:49 UTCEG score recompute
  23. 2026-09-12 01:49 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  24. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  25. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  26. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  27. 2026-09-08 01:52 UTCEG score recompute
  28. 2026-09-08 01:52 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  29. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  30. 2026-09-06 13:48 UTCEG score recompute
  31. 2026-09-06 13:48 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  32. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  33. 2026-09-05 21:22 UTCEG score recompute
  34. 2026-09-05 21:22 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  35. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  36. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  37. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  38. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  39. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  40. 2026-08-30 18:17 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  41. 2026-08-30 05:27 UTCEG score recompute
  42. 2026-08-30 05:27 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  43. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  44. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  45. 2026-08-27 21:35 UTCEG score recompute
  46. 2026-08-27 21:35 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  47. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  48. 2026-08-27 05:12 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  49. 2026-08-26 15:18 UTCEG score recompute
  50. 2026-08-26 15:18 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  51. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  52. 2026-08-26 02:15 UTCEG score recompute
  53. 2026-08-26 02:15 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  54. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  55. 2026-08-25 11:01 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  56. 2026-08-24 22:11 UTCEG score recompute
  57. 2026-08-24 22:11 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  58. 2026-08-24 09:17 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  59. 2026-08-23 20:03 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  60. 2026-08-23 07:12 UTCEG score recompute
  61. 2026-08-23 07:12 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  62. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  63. 2026-08-22 18:20 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  64. 2026-08-22 05:30 UTCEG score recompute
  65. 2026-08-22 05:30 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  66. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  67. 2026-08-21 16:40 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  68. 2026-08-21 03:35 UTCEG score recompute
  69. 2026-08-21 03:35 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  70. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  71. 2026-08-20 14:41 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  72. 2026-08-20 01:08 UTCEG score recompute
  73. 2026-08-20 01:08 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8
  74. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  75. 2026-08-19 09:15 UTCGHSA enrichmentGHSA-cfx5-q5qm-x936 · GitHub severity HIGH · GitHub CVSS 8.8

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-57856?
CVE-2026-57856 is a high-severity vulnerability; its CVE record was published on July 13, 2026. Cockpit CMS contains a path traversal vulnerability in the Bucket file storage API (/system/buckets/api). The api() method in modules/System/Controller/Buckets.php sanitizes the bucket name with pregreplace('/[^a-zA-Z0-9-\\.]/','', $bucket), which permits '..' and '../' sequences. The sanitized…
When was CVE-2026-57856 made public?
CVE-2026-57856 was made public on July 13, 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 July 13, 2026. EchelonGraph's copy of the record carries a last-modified date of July 14, 2026; the record at its source may have been updated since.
Is CVE-2026-57856 actively exploited?
CVE-2026-57856 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-57856?
CVE-2026-57856 has a CVSS base score of 8.8 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-57856?
A fix for CVE-2026-57856 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-57856 are linked in the Vendor Advisories panel on this page.

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