Concrete CMS 9.5.0 and below is vulnerable to File Download Authorization Bypass in submit_password()

published 2026-05-21 5 mo ago modified 2026-07-23 3 mo ago also GHSA-fqg3-8w8r-8g94 , EUVD-2026-31356

cvss: 5.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits: 0; none known

In Concrete CMS 9.5.0 and below, the submit_password() method in concrete/controllers/single_page/download_file.php allows unauthorized file access since downloading permission-restricted files bypasses the view_file permission check. Files without passwords can be downloaded and any user who knows a file's password can download a password protected file regardless of whether they have permission to access the file. 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:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Youssef Eid for reporting

Patch / fix

fixed in 2

packagist concrete5/concrete5 9.5.1
concretecms concrete_cms 9.5.1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 5 mo ago (2026-05-22)

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.3	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CNA	4.0	6.3	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	concrete5/concrete5	<9.5.1	9.5.1

Affected products

Concrete CMS Concrete CMS

Classification

Weakness

CWE-862 Missing Authorization

References

documentation.concretecms.org /9-x/developers/introduction/version-history/951-release-notes
release-notes, web
nvd.nist.gov /vuln/detail/CVE-2026-7879
advisory
github.com /concretecms/concretecms
package

Sources

CVE List CVE-2026-7879
GitHub Advisory GHSA-fqg3-8w8r-8g94
NVD CVE-2026-7879

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Summary