CVE-2026-87028

MEDIUMNVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-09-16. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: 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 9.5.3 did not confirm that a board InstanceItem submitted to the custom-slot preview endpoint belonged to the board instance the requesting user was authorized to edit, and did not enforce page-view permission before generating page-backed summary content. As a result, an authenticated user holding edit-board-contents permission on a single board instance could submit the identifier of an item belonging to a different board instance and receive summary fields, including the page title and description, of an underlying page the same user was otherwise forbidden to view. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.3 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Pakung for reporting.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 21, 2026

References (1)

Vendor Advisories for CVE-2026-87028(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 20× in last 7d / 29× 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. 2026-09-24 17:13 UTCEG score recompute
  2. 2026-09-24 17:13 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-23 17:28 UTCGHSA enrichment
  5. 2026-09-22 17:41 UTCEG score recompute
  6. 2026-09-22 17:41 UTCGHSA enrichment
  7. 2026-09-22 16:01 UTCEPSS rescore
  8. 2026-09-21 21:09 UTCEPSS rescore
  9. 2026-09-21 17:55 UTCEG score recompute▲ 1.20
  10. 2026-09-21 17:55 UTCGHSA enrichment
  11. 2026-09-21 17:55 UTCNVD updateCVSS v3 → 6.5
  12. 2026-09-21 17:32 UTCEG score recompute
  13. 2026-09-21 17:32 UTCGHSA enrichment
  14. 2026-09-20 20:16 UTCEPSS rescore
  15. 2026-09-20 17:43 UTCGHSA enrichment
  16. 2026-09-19 17:58 UTCEG score recompute
  17. 2026-09-19 17:58 UTCGHSA enrichment
  18. 2026-09-18 19:28 UTCEPSS rescore
  19. 2026-09-18 18:12 UTCEG score recompute
  20. 2026-09-18 18:12 UTCGHSA enrichment
  21. 2026-09-17 19:32 UTCEPSS rescore
  22. 2026-09-17 18:26 UTCEG score recompute
  23. 2026-09-17 18:26 UTCGHSA enrichment
  24. 2026-09-17 18:00 UTCEG score recompute
  25. 2026-09-17 18:00 UTCGHSA enrichment
Show 4 more
  1. 2026-09-16 19:25 UTCGHSA enrichment
  2. 2026-09-16 17:26 UTCEG score recompute
  3. 2026-09-16 16:46 UTCEG score recompute
  4. 2026-09-16 16:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-87028?
CVE-2026-87028 is a medium vulnerability published on September 16, 2026. Concrete CMS 9 through 9.5.3 did not confirm that a board InstanceItem submitted to the custom-slot preview endpoint belonged to the board instance the requesting user was authorized to edit, and did not enforce page-view permission before generating page-backed summary content. As a result, an…
When was CVE-2026-87028 disclosed?
CVE-2026-87028 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87028 actively exploited?
CVE-2026-87028 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 71.3% of all scored CVEs.
What is the CVSS score of CVE-2026-87028?
CVE-2026-87028 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-87028?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87028, 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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