CVE-2026-18122

MEDIUMPre-NVD 6.06.0—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (12th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
6.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.0Exploit: None knownExposed services: Not assessed

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

Concrete CMS 9.2.0 to 9.5.2 Express REST API list endpoint exposes restricted Express entries via Missing Authorization; the Concrete CMS REST API's Express entry collection endpoint disabled the per-entry view permission check. An OAuth token with read scope for an Express entity could enumerate entries that its user context lacked permission to view, disclosing each entry's public identifier, URL, label, dates, and any attribute or associated-entry data requested via the includes parameter. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 6.0 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks riodrwn for reporting.

CVSS v3
6.0
EG Score
6.0MEDIUMmedium confidence
EG Risk
27
EG Risk 27/100CISA SSVC

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
Severity60% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
12th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 11, 2026

Last Modified

September 11, 2026

References (1)

Vendor Advisories for CVE-2026-18122(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 / 65× 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. 2026-10-05 03:36 UTCEG score recompute
  2. 2026-10-05 03:36 UTCGHSA enrichment
  3. 2026-10-04 23:21 UTCEPSS rescore
  4. 2026-10-04 03:32 UTCEG score recompute
  5. 2026-10-04 03:32 UTCGHSA enrichment
  6. 2026-10-03 14:25 UTCEPSS rescore
  7. 2026-10-03 03:29 UTCEG score recompute
  8. 2026-10-03 03:29 UTCGHSA enrichment
  9. 2026-10-02 03:26 UTCEG score recompute
  10. 2026-10-02 03:25 UTCGHSA enrichment
  11. 2026-10-01 19:49 UTCEPSS rescore
  12. 2026-10-01 02:08 UTCEG score recompute
  13. 2026-10-01 02:08 UTCGHSA enrichment
  14. 2026-09-30 15:02 UTCEPSS rescore
  15. 2026-09-30 01:49 UTCEG score recompute
  16. 2026-09-30 01:49 UTCGHSA enrichment
  17. 2026-09-29 15:20 UTCEPSS rescore
  18. 2026-09-28 22:58 UTCEG score recompute
  19. 2026-09-28 22:58 UTCGHSA enrichment
  20. 2026-09-28 13:51 UTCEPSS rescore
  21. 2026-09-27 22:51 UTCEG score recompute
  22. 2026-09-27 22:51 UTCGHSA enrichment
  23. 2026-09-27 13:47 UTCEPSS rescore
  24. 2026-09-26 22:47 UTCEG score recompute
  25. 2026-09-26 22:47 UTCGHSA enrichment
Show 40 more
  1. 2026-09-26 15:58 UTCEPSS rescore
  2. 2026-09-25 22:43 UTCGHSA enrichment
  3. 2026-09-24 21:44 UTCEG score recompute
  4. 2026-09-24 21:44 UTCGHSA enrichment
  5. 2026-09-23 21:39 UTCEG score recompute
  6. 2026-09-23 21:39 UTCGHSA enrichment
  7. 2026-09-22 21:36 UTCEG score recompute
  8. 2026-09-22 21:36 UTCGHSA enrichment
  9. 2026-09-21 21:32 UTCEG score recompute
  10. 2026-09-21 21:32 UTCGHSA enrichment
  11. 2026-09-20 21:28 UTCEG score recompute
  12. 2026-09-20 21:28 UTCGHSA enrichment
  13. 2026-09-19 21:24 UTCEG score recompute
  14. 2026-09-19 21:24 UTCGHSA enrichment
  15. 2026-09-18 21:20 UTCEG score recompute
  16. 2026-09-18 21:20 UTCGHSA enrichment
  17. 2026-09-18 19:27 UTCEPSS rescore
  18. 2026-09-17 21:17 UTCEG score recompute
  19. 2026-09-17 21:17 UTCGHSA enrichment
  20. 2026-09-16 21:13 UTCEG score recompute
  21. 2026-09-16 21:13 UTCGHSA enrichment
  22. 2026-09-16 14:07 UTCEPSS rescore
  23. 2026-09-16 05:14 UTCEPSS rescore
  24. 2026-09-15 20:49 UTCEG score recompute
  25. 2026-09-15 20:49 UTCGHSA enrichment
  26. 2026-09-14 20:28 UTCGHSA enrichment
  27. 2026-09-13 20:25 UTCEG score recompute
  28. 2026-09-13 20:25 UTCGHSA enrichment
  29. 2026-09-13 16:46 UTCEPSS rescore
  30. 2026-09-12 20:22 UTCEG score recompute
  31. 2026-09-12 20:22 UTCGHSA enrichment
  32. 2026-09-12 15:00 UTCEPSS rescore
  33. 2026-09-11 20:18 UTCEG score recompute
  34. 2026-09-11 20:18 UTCGHSA enrichment
  35. 2026-09-11 19:29 UTCEG score recompute
  36. 2026-09-11 19:28 UTCGHSA enrichment
  37. 2026-09-11 18:34 UTCEG score recompute
  38. 2026-09-11 18:34 UTCGHSA enrichment
  39. 2026-09-11 17:19 UTCEG score recompute
  40. 2026-09-11 17:18 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-18122?
CVE-2026-18122 is a medium vulnerability published on September 11, 2026. Concrete CMS 9.2.0 to 9.5.2 Express REST API list endpoint exposes restricted Express entries via Missing Authorization; the Concrete CMS REST API's Express entry collection endpoint disabled the per-entry view permission check. An OAuth token with read scope for an Express entity could enumerate…
When was CVE-2026-18122 disclosed?
CVE-2026-18122 was first published on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18122 actively exploited?
CVE-2026-18122 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (12th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18122?
CVE-2026-18122 has a CVSS base score of 6.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18122?
No fix for CVE-2026-18122 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-18122 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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