CVE-2026-8427

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: LOW) published 2026-05-22. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

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

Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file removeFavoriteFolder($id). The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori (Tenzai) for reporting.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
3.0%
KEV
Not listed

Published

May 21, 2026

Last Modified

May 26, 2026

Advisory Details (1)

Auto-updated Jun 2, 2026
No patch confirmed yet.
generic

9.5.1 Release Notes :: Concrete CMS

https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes

Vendor Advisories for CVE-2026-8427(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
concrete5/concrete59.0.0 ... 9.5.0RC2 (45 versions)9.5.1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 63× 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 130 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8427?
CVE-2026-8427 is a high vulnerability published on May 21, 2026. Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file removeFavoriteFolder($id). The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector…
When was CVE-2026-8427 disclosed?
CVE-2026-8427 was first published in the National Vulnerability Database on May 21, 2026, with the most recent update on May 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8427 actively exploited?
CVE-2026-8427 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8427?
CVE-2026-8427 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-8427?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8427, 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

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