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CVE-2026-107850— Contao: Improper access control in the preview links module

Quick assessment

Affected
contao contao
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Contao 是一个开源的内容管理系统（CMS）。从版本 5.7.1 到 5.7.12， 中注册了预览访问 voters，将其类名声明为 ，但实际提供的类是 。由于 Symfony 的 voter 自动配置机制无法匹配正确的类名，因此会省略自动配置并移除该私有服务，导致 方法无法正确实施所有权检查。 具有 模块权限的非管理员后端用户能够列出所有的 记录，获取其他用户创建的已签名分享链接，并利用这些链接在缺乏页面权限的情况下查看未发布的页面（通过 功能）。该安全公告并未涉及对他人链接的编辑或删除权限问题。此问题已在版

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-107850

Vulnerability Information
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Vulnerability Title
Contao: Improper access control in the preview links module
Source: CVE Program / CVE List V5
Vulnerability Description
Contao is an Open Source CMS. From version 5.7.1 until 5.7.12, core-bundle/config/services.yaml registers the preview access voter as Contao\CoreBundle\Security\Voter\DataContainer\PreviewAccessVoter although the shipped class is PreviewVoter. Symfony therefore omits voter autoconfiguration and removes the private service, so PreviewVoter::hasAccess() never enforces ownership. A non-admin backend user with the preview_link module can list every tl_preview_link record, obtain signed share URLs created by other users, and use them to view unpublished pages with showUnpublished despite lacking page permission. The advisory does not establish editing or deletion of foreign links. This issue is fixed in version 5.7.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
contao contao >= 5.7.1, < 5.7.12 -

II. Public POCs for CVE-2026-107850

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III. Intelligence Information for CVE-2026-107850

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Vendor Pages for CVE-2026-107850 (1)

Other References for CVE-2026-107850 (2)

Same Patch Batch · contao · 2026-10-09 · 7 CVEs total

CVE-2026-107845 9.3 CRITICAL Contao: Cross-site scripting in the comments bundle
CVE-2026-107842 5.3 MEDIUM Contao: Protected page content is disclosed to anonymous visitors after contao.search.inde
CVE-2026-107844 5.3 MEDIUM Contao: Path traversal in the images controller
CVE-2026-107843 5.3 MEDIUM Contao: The registration module re-sends activation mails on any unauthenticated POST, wit
CVE-2026-107851 4.3 MEDIUM Contao: Improper access control in the table access voter
CVE-2026-107848 3.5 LOW Contao: Cross-site request forgery in custom backend actions

IV. Related Vulnerabilities

Same product: contao
Same vendor: contao
Same weakness: CWE-639

V. Comments for CVE-2026-107850

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