Concrete CMS 9.5.0 and below is vulnerable to unauthorized file deletion due to an Inverted CSRF token check in the DeleteFile controller. The code throws an error when the token IS valid and proceeds with file deletion when the token is invalid or missing. This effectively disables CSRF protection for the file deletion endpoint, allowing cross-site request forgery attacks against users who have permission to edit conversation messages. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with a vector of CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Tristan Mandani for reporting.
CVE-2026-7882
LOWNVD 2.32.3—
EchelonGraph scoreMEDIUM confidence
This low-severity CVE scores 2.3 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 91% 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, nvd
2.3
- CVSS v3
- 2.3
- EG Score
- 2.3(medium)
- EPSS
- 9.3%
- KEV
- Not listed
Published
May 21, 2026
Last Modified
May 21, 2026
References (1)
- ff5b8ace-8b95-4078-9743-eac1ca5451dehttps://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
Frequently asked(5)
What is CVE-2026-7882?
CVE-2026-7882 is a low vulnerability published on May 21, 2026. Concrete CMS 9.5.0 and below is vulnerable to unauthorized file deletion due to an Inverted CSRF token check in the DeleteFile controller. The code throws an error when the token IS valid and proceeds with file deletion when the token is invalid or missing. This effectively disables CSRF protection…
When was CVE-2026-7882 disclosed?
CVE-2026-7882 was first published in the National Vulnerability Database on May 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7882 actively exploited?
CVE-2026-7882 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-7882?
CVE-2026-7882 has a CVSS v3 base score of 2.3 (NVD).
How do I remediate CVE-2026-7882?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7882, 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
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-7882
Is Your Infrastructure Affected by CVE-2026-7882?
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