CVE-2026-18110

HIGHNVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: 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 (9.0.0 through 9.5.2) does not perform an authorization check on the user selector autocomplete endpoint (/ccm/system/user/autocomplete), which backs the "Preview as User" panel and other user-selector components. The endpoint validates only a CSRF-style access token that is bound to the selector's display options rather than to the caller's identity or permissions, and that token is issued to anonymous visitors because the selector renders without an authorization check. Because an empty query resolves to a match-all filter, an unauthenticated attacker can submit an empty search and paginate the results to enumerate every backend account, disclosing the internal user ID, username, and email address of all administrative users, including the super-administrator (user ID 1). No password hashes or session material are disclosed The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 8.7 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks thirtythree and YesWeHack for reporting.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
17th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (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 15, 2026

Last Modified

September 22, 2026

References (1)

Vendor Advisories for CVE-2026-18110(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 / 79× 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 03:30 UTCEG score recompute
  2. 2026-10-05 03:30 UTCGHSA enrichment
  3. 2026-10-04 23:21 UTCEPSS rescore
  4. 2026-10-04 15:45 UTCGHSA enrichment
  5. 2026-10-04 04:00 UTCGHSA enrichment
  6. 2026-10-03 16:15 UTCEG score recompute
  7. 2026-10-03 16:15 UTCGHSA enrichment
  8. 2026-10-03 14:25 UTCEPSS rescore
  9. 2026-10-03 04:31 UTCGHSA enrichment
  10. 2026-10-02 16:46 UTCEG score recompute
  11. 2026-10-02 16:46 UTCGHSA enrichment
  12. 2026-10-02 05:02 UTCEG score recompute
  13. 2026-10-02 05:02 UTCGHSA enrichment
  14. 2026-10-01 19:49 UTCEPSS rescore
  15. 2026-10-01 17:08 UTCGHSA enrichment
  16. 2026-10-01 05:00 UTCGHSA enrichment
  17. 2026-09-30 17:04 UTCEG score recompute
  18. 2026-09-30 17:04 UTCGHSA enrichment
  19. 2026-09-30 15:02 UTCEPSS rescore
  20. 2026-09-30 04:48 UTCGHSA enrichment
  21. 2026-09-29 16:53 UTCEG score recompute
  22. 2026-09-29 16:53 UTCGHSA enrichment
  23. 2026-09-29 15:20 UTCEPSS rescore
  24. 2026-09-29 04:51 UTCEG score recompute
  25. 2026-09-29 04:51 UTCGHSA enrichment
Show 54 more
  1. 2026-09-28 17:07 UTCEG score recompute
  2. 2026-09-28 17:07 UTCGHSA enrichment
  3. 2026-09-28 13:51 UTCEPSS rescore
  4. 2026-09-28 05:17 UTCGHSA enrichment
  5. 2026-09-27 17:33 UTCEG score recompute
  6. 2026-09-27 17:33 UTCGHSA enrichment
  7. 2026-09-27 13:47 UTCEPSS rescore
  8. 2026-09-27 05:48 UTCGHSA enrichment
  9. 2026-09-26 18:02 UTCEG score recompute
  10. 2026-09-26 18:02 UTCGHSA enrichment
  11. 2026-09-26 15:58 UTCEPSS rescore
  12. 2026-09-26 06:17 UTCEG score recompute
  13. 2026-09-26 06:17 UTCGHSA enrichment
  14. 2026-09-25 18:30 UTCGHSA enrichment
  15. 2026-09-25 05:55 UTCGHSA enrichment
  16. 2026-09-24 18:10 UTCEG score recompute
  17. 2026-09-24 18:10 UTCGHSA enrichment
  18. 2026-09-24 05:48 UTCGHSA enrichment
  19. 2026-09-23 18:03 UTCEG score recompute
  20. 2026-09-23 18:03 UTCGHSA enrichment
  21. 2026-09-23 06:19 UTCGHSA enrichment
  22. 2026-09-22 18:34 UTCGHSA enrichment
  23. 2026-09-22 18:08 UTCEG score recompute
  24. 2026-09-22 18:08 UTCGHSA enrichment
  25. 2026-09-22 17:42 UTCEG score recompute
  26. 2026-09-22 17:42 UTCGHSA enrichment
  27. 2026-09-22 05:41 UTCEG score recompute
  28. 2026-09-22 05:40 UTCGHSA enrichment
  29. 2026-09-21 17:55 UTCEG score recompute▼ 1.20
  30. 2026-09-21 17:55 UTCGHSA enrichment
  31. 2026-09-21 17:55 UTCNVD updateCVSS v3 → 7.5
  32. 2026-09-21 17:20 UTCGHSA enrichment
  33. 2026-09-21 05:34 UTCEG score recompute
  34. 2026-09-21 05:34 UTCGHSA enrichment
  35. 2026-09-20 17:50 UTCGHSA enrichment
  36. 2026-09-20 06:05 UTCGHSA enrichment
  37. 2026-09-19 18:20 UTCEG score recompute
  38. 2026-09-19 18:20 UTCGHSA enrichment
  39. 2026-09-19 06:35 UTCEG score recompute
  40. 2026-09-19 06:35 UTCGHSA enrichment
  41. 2026-09-18 19:27 UTCEPSS rescore
  42. 2026-09-18 18:50 UTCGHSA enrichment
  43. 2026-09-18 07:06 UTCEG score recompute
  44. 2026-09-18 07:06 UTCGHSA enrichment
  45. 2026-09-17 19:21 UTCGHSA enrichment
  46. 2026-09-17 07:13 UTCGHSA enrichment
  47. 2026-09-16 19:26 UTCGHSA enrichment
  48. 2026-09-16 17:55 UTCEG score recompute
  49. 2026-09-16 17:55 UTCGHSA enrichment
  50. 2026-09-16 14:07 UTCEPSS rescore
  51. 2026-09-16 05:16 UTCGHSA enrichment
  52. 2026-09-15 17:32 UTCEG score recompute
  53. 2026-09-15 16:43 UTCEG score recompute
  54. 2026-09-15 16:42 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-18110?
CVE-2026-18110 is a high vulnerability published on September 15, 2026. Concrete CMS 9 (9.0.0 through 9.5.2) does not perform an authorization check on the user selector autocomplete endpoint (/ccm/system/user/autocomplete), which backs the "Preview as User" panel and other user-selector components. The endpoint validates only a CSRF-style access token that is bound to…
When was CVE-2026-18110 disclosed?
CVE-2026-18110 was first published on September 15, 2026, with the most recent update on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18110 actively exploited?
CVE-2026-18110 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (17th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18110?
CVE-2026-18110 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-18110?
No fix for CVE-2026-18110 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-2026-18110 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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