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CVE-2026-55824— Contao crawler leaks auth credentials to external hosts

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Contao组织开源的一套采用PHP开发的开源内容管理系统(CMS)。该系统支持搜索引擎、权限管理和CSS框架等。 Contao 4.13.40版本至5.3.46版本和5.7.0-RC1版本至5.7.6版本存在信息泄露漏洞，该漏洞源于爬虫清理HTTP客户端选项时未正确移除Symfony HttpClient的认证选项，导致认证凭据泄露给外部主机，攻击者可通过让外部URL被爬取获取爬虫凭据。

CVSS 2.6 · Low EPSS 0.24% · P14

Affected Version Matrix 2

VendorProduct Version RangeStatus
contao contao >= 4.13.40, < 5.3.47 affected
>= 5.7.0-RC1, < 5.7.7 affected
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I. Basic Information for CVE-2026-55824

Vulnerability Information
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Vulnerability Title
Contao crawler leaks auth credentials to external hosts
Source: CVE Program / CVE List V5
Vulnerability Description
Contao is an Open Source CMS. In versions 4.13.40 through 5.3.46 and 5.7.0-RC1 through 5.7.6, the crawler leaks auth credentials to external hosts. Contao's crawler tries to prevent confidential HTTP client options from being sent to external domains by creating a scoped client: full options for root page origins, cleaned options for everything else. The cleaner removes Cookie and Authorization headers, but it removes the non-Symfony option names basic_auth and bearer_auth instead of Symfony HttpClient's real auth_basic and auth_bearer options. When contao.crawl.default_http_client_options contains Basic or Bearer authentication for a protected staging/production site, those credentials remain in the "clean" client used for external links or configured additional URIs. An attacker who can get an external URL crawled, for example through a link on a crawled page while the broken-link checker is enabled, can receive the crawler credentials. This issue has been fixed in versions 5.3.47 and 5.7.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Contao 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Contao是Contao组织开源的一套采用PHP开发的开源内容管理系统(CMS)。该系统支持搜索引擎、权限管理和CSS框架等。 Contao 4.13.40版本至5.3.46版本和5.7.0-RC1版本至5.7.6版本存在信息泄露漏洞，该漏洞源于爬虫清理HTTP客户端选项时未正确移除Symfony HttpClient的认证选项，导致认证凭据泄露给外部主机，攻击者可通过让外部URL被爬取获取爬虫凭据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
contao contao >= 4.13.40, < 5.3.47 -

II. Public POCs for CVE-2026-55824

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III. Intelligence Information for CVE-2026-55824

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Vendor Advisories for CVE-2026-55824 (1)

Same Patch Batch · contao · 2026-07-31 · 3 CVEs total

CVE-2026-57232 3.1 LOW Contao: Server-Side Request Forgery (SSRF) via Unvalidated RSS Feed URL in Feed Reader Mod
CVE-2026-55825 3.1 LOW Contao: Possible path traversal in job download URIs

IV. Related Vulnerabilities

Same product: contao
Same vendor: contao
Same weakness: CWE-200

V. Comments for CVE-2026-55824

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