---
cve: "CVE-2026-8238"
severity: "MEDIUM"
cvss: 6.3
epss: "20%"
vendor: "Concrete CMS"
kev: false
exploited: false
published: "2026-05-21 22:16:49"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T22:35:30+02:00"
---

# CVE-2026-8238

> 6.3 MEDIUM

## Beschreibung

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/message_page' 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 Tristan Madani for reporting.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 92bae566b9ec573cfb3017fcbb6db454a6586997 (Commit)

## Referenzen

- <https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-8238) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_