CVE-2026-68526

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 87% of all CVEs by exploit prediction. 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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

Concrete CMS before 9.5.3 did not validate an anti-CSRF token in the Calendar event duplicate dialog controller (concrete/controllers/dialog/event/duplicate.php) submit() action, which duplicated a calendar event after checking only canAccess() and the per-resource canAddCalendarEvent() permission, so a crafted cross-site request could cause an authenticated user with add-event permission to create duplicate CalendarEvents and CalendarEventVersions records under their own authority. 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:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 15, 2026

Advisory Details (1)

Auto-updated Sep 11, 2026
No patch confirmed yet.
generic

9.5.3 Release Notes :: Concrete CMS

https://documentation.concretecms.org/9-x/developers/introduction/version-history/953-release-notes

Vendor Advisories for CVE-2026-68526(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 18× in last 7d / 39× 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 17:15 UTCEG score recompute
  2. 2026-09-24 17:15 UTCGHSA enrichment
  3. 2026-09-23 19:33 UTCEG score recompute
  4. 2026-09-23 19:32 UTCGHSA enrichment
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-22 20:49 UTCEG score recompute
  7. 2026-09-22 20:49 UTCGHSA enrichment
  8. 2026-09-21 23:07 UTCEG score recompute
  9. 2026-09-21 23:07 UTCGHSA enrichment
  10. 2026-09-21 21:09 UTCEPSS rescore
  11. 2026-09-21 01:24 UTCEG score recompute
  12. 2026-09-21 01:24 UTCGHSA enrichment
  13. 2026-09-20 20:16 UTCEPSS rescore
  14. 2026-09-20 03:34 UTCEG score recompute
  15. 2026-09-20 03:34 UTCGHSA enrichment
  16. 2026-09-19 05:51 UTCEG score recompute
  17. 2026-09-19 05:51 UTCGHSA enrichment
  18. 2026-09-18 19:28 UTCEPSS rescore
  19. 2026-09-18 08:09 UTCEG score recompute
  20. 2026-09-18 08:09 UTCGHSA enrichment
  21. 2026-09-17 10:27 UTCEG score recompute
  22. 2026-09-17 10:27 UTCGHSA enrichment
  23. 2026-09-16 14:08 UTCEPSS rescore
  24. 2026-09-16 12:44 UTCEG score recompute
  25. 2026-09-16 12:44 UTCGHSA enrichment
Show 14 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 15:02 UTCGHSA enrichment
  3. 2026-09-15 11:19 UTCEG score recompute
  4. 2026-09-15 11:19 UTCGHSA enrichment
  5. 2026-09-14 13:36 UTCEG score recompute
  6. 2026-09-14 13:36 UTCGHSA enrichment
  7. 2026-09-14 13:10 UTCEG score recompute
  8. 2026-09-14 13:10 UTCGHSA enrichment
  9. 2026-09-13 15:43 UTCGHSA enrichment
  10. 2026-09-12 18:01 UTCEG score recompute
  11. 2026-09-12 18:00 UTCGHSA enrichment
  12. 2026-09-11 20:18 UTCEG score recompute
  13. 2026-09-11 19:44 UTCEG score recompute
  14. 2026-09-11 19:43 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-68526?
CVE-2026-68526 is a medium vulnerability published on September 11, 2026. Concrete CMS before 9.5.3 did not validate an anti-CSRF token in the Calendar event duplicate dialog controller (concrete/controllers/dialog/event/duplicate.php) submit() action, which duplicated a calendar event after checking only canAccess() and the per-resource canAddCalendarEvent() permission,…
When was CVE-2026-68526 disclosed?
CVE-2026-68526 was first published in the National Vulnerability Database on September 11, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-68526 actively exploited?
CVE-2026-68526 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 86.8% of all scored CVEs.
What is the CVSS score of CVE-2026-68526?
CVE-2026-68526 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-68526?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-68526, 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

Explore the affected products and dependency analysis for CVE-2026-68526

Explore →

Is Your Infrastructure Affected by CVE-2026-68526?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs