CVE-2026-81902

HIGHNVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-14. NVD baseline CVSS 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

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

Concrete CMS 9 through 9.5.2 did not validate a CSRF token in the orphaned block removal panel action (removeOrphanedBlocks). A remote attacker could craft a request that, when loaded by an authenticated user holding edit permission on the target page, deleted every block on that page's current version; blocks not aliased to another page or scrapbook entry were also removed from the global Blocks table and their block-type data table, permanently destroying the content. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.1 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai for reporting.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 18, 2026

References (1)

Vendor Advisories for CVE-2026-81902(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 28× in last 7d / 47× 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.

  1. 2026-09-25 00:01 UTCEG score recompute
  2. 2026-09-25 00:01 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 11:30 UTCGHSA enrichment
  5. 2026-09-23 23:11 UTCEG score recompute
  6. 2026-09-23 23:11 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 10:23 UTCGHSA enrichment
  9. 2026-09-22 22:04 UTCEG score recompute
  10. 2026-09-22 22:04 UTCGHSA enrichment
  11. 2026-09-22 16:01 UTCEPSS rescore
  12. 2026-09-22 09:45 UTCGHSA enrichment
  13. 2026-09-21 21:26 UTCEG score recompute
  14. 2026-09-21 21:26 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 09:07 UTCGHSA enrichment
  17. 2026-09-20 20:48 UTCEG score recompute
  18. 2026-09-20 20:48 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 08:29 UTCGHSA enrichment
  21. 2026-09-19 20:08 UTCEG score recompute
  22. 2026-09-19 20:08 UTCGHSA enrichment
  23. 2026-09-19 07:49 UTCEG score recompute
  24. 2026-09-19 07:49 UTCGHSA enrichment
  25. 2026-09-18 19:30 UTCEG score recompute▲ 1.00
Show 22 more
  1. 2026-09-18 19:30 UTCGHSA enrichment
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 19:26 UTCNVD updateCVSS v3 → 8.1
  4. 2026-09-18 07:44 UTCEG score recompute
  5. 2026-09-18 07:44 UTCGHSA enrichment
  6. 2026-09-17 19:25 UTCGHSA enrichment
  7. 2026-09-17 04:34 UTCGHSA enrichment
  8. 2026-09-16 16:14 UTCEG score recompute
  9. 2026-09-16 16:14 UTCGHSA enrichment
  10. 2026-09-16 14:08 UTCEPSS rescore
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-16 03:53 UTCGHSA enrichment
  13. 2026-09-15 15:32 UTCGHSA enrichment
  14. 2026-09-15 15:01 UTCEG score recompute
  15. 2026-09-15 15:01 UTCGHSA enrichment
  16. 2026-09-15 14:34 UTCEG score recompute
  17. 2026-09-15 14:34 UTCGHSA enrichment
  18. 2026-09-15 09:52 UTCGHSA enrichment
  19. 2026-09-14 21:33 UTCEG score recompute
  20. 2026-09-14 21:32 UTCGHSA enrichment
  21. 2026-09-14 20:45 UTCEG score recompute
  22. 2026-09-14 20:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81902?
CVE-2026-81902 is a high vulnerability published on September 14, 2026. Concrete CMS 9 through 9.5.2 did not validate a CSRF token in the orphaned block removal panel action (removeOrphanedBlocks). A remote attacker could craft a request that, when loaded by an authenticated user holding edit permission on the target page, deleted every block on that page's current…
When was CVE-2026-81902 disclosed?
CVE-2026-81902 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81902 actively exploited?
CVE-2026-81902 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 86.6% of all scored CVEs.
What is the CVSS score of CVE-2026-81902?
CVE-2026-81902 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-81902?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81902, 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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