CVE-2026-57856

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

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: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: Track*

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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

July 13, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated Jul 14, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit.
generic

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
generic

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
generic

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
generic🟡 PoC Available

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 19× in last 7d / 106× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 154 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-57856?
CVE-2026-57856 is a high vulnerability 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 disclosed?
CVE-2026-57856 was first published in the National Vulnerability Database on July 13, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57856 actively exploited?
CVE-2026-57856 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.7% of all scored CVEs.
What is the CVSS score of CVE-2026-57856?
CVE-2026-57856 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-57856?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57856, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-57856

Explore →

Is Your Infrastructure Affected by CVE-2026-57856?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs