VulnSocial

CVE-2026-8237Disclosure(concretecms / concrete_cms)

LOWCVSS 5.3 · MEDIUM

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The `/ccm/frontend/conversations/message_detail` endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and the moderation queue. File attachments with download URLs are also exposed. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Eldudareeno for reporting.

concretecms CVEsBack to dashboard
1.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-862

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • concrete_cms

Threat summary

  • Public PoC is present in monitored signal
  • 1 mentions across 1 observed day

What's happening

  • PoC mentioned or linked in 1 signal
  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
concretecms
Products
concrete_cms

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-08-19: 1PoC Mentioned / Linked · 2026-08-19: 1Technical Details · 2026-08-19: 108-19
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • pdnuclei-bot@pdnuclei_bot
    Disclosure

    🚨 CVE-2026-8237 - medium 🚨 Concrete CMS <= 9.5.0 - Unauthenticated Conversation Message Disclosure (IDOR) > Concrete CMS <= 9.5.0 contains an IDOR caused by insufficient access control in /ccm/... 👾 https://cloud.projectdiscovery.io/library/CVE-2026-8237 @pdnuclei #NucleiT...

    Post summary

    The tweet announces a medium‑severity IDOR in Concrete CMS (<=9.5.0) that permits unauthenticated message disclosure, linking to a ProjectDiscovery library entry but not providing a patch or exploit.

    00023371
    1.3K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appconcretecmsconcrete_cms---

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