Vulnerability record
CVE-2026-126662
The short answer
CVE-2026-126662 affects Contao Contao and is rated high (CVSS 7.1). It is not in CISA's Known Exploited Vulnerabilities catalog.
What it is
Contao 4.0.0 before 5.3.54, 5.4.0 before 5.7.17, and 6.0.0 before 6.0.6 contains an access control bypass vulnerability that allows filemount-restricted backend users to modify folders outside their filemount via the file manager Edit-Multiple operation. Attackers holding the protected or syncExclude field permission can submit outside folder paths in the IDS parameter to publish protected folders or exclude them from DBAFS synchronization, exposing files for public download.
Weakness: CWE-862.
Severity
7.1 high
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/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
Exploited (CISA KEV)
Not listed
CISA lists confirmed exploitation only
EPSS, next 30 days
No score
FIRST scores CVEs within a day of publication
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- Low
- User interaction
- None
- Confidentiality impact
- High
- Integrity impact
- Low
- Availability impact
- None
Affected products
Contao. NVD's record lists the exact affected versions.
References
- github.com/contao/contao/blob/5.3.53/core-bundle/contao/drivers/DC_Folder.php#L1716-L1720
- github.com/contao/contao/commit/240e169441796bb703819ee0e22728708f946b70
- github.com/contao/contao/commit/a104202df2b532bb64805a0856fc94bb0bddbb66
- github.com/contao/contao/commit/c01898f99c5d5af50a227ee85f27270c5427f900
- github.com/contao/contao/releases/tag/5.3.54
- github.com/contao/contao/releases/tag/5.7.17
- github.com/contao/contao/releases/tag/6.0.6
- github.com/contao/contao/security/advisories/GHSA-9jfh-v443-w3fj
- www.vulncheck.com/advisories/contao-4.0.0-before-5.3.54-5.4.0-before-5.7.17-and-6.0.0-before-6.0.6-filemount-bypass-via-edit-multiple
Questions
Is CVE-2026-126662 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog as of 2026-11-11.
How do I fix CVE-2026-126662?
Follow the vendor advisory in the references below. NVD lists the affected versions under its configurations.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Deferred. The description is NVD's text, quoted as published.
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