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CVE-2026-111053— FOSSBilling: Unauthenticated attacker can probe existence of arbitrary files via guest/system/template_exists

Quick assessment

Affected
FOSSBilling FOSSBilling
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.

FOSSBilling 是一个开源的账单与客户管理平台。在版本 0.1.0 至 0.8.7 期间，未认证的 API 端点 存在路径遍历漏洞。该漏洞源于 函数对攻击者可控制的 参数使用了 方法，但既未拒绝包含 的路径序列，也未验证解析后的路径是否仍位于当前激活的主题目录内。攻击者可通过向 端点发送包含路径遍历序列的未认证请求来触发此漏洞。通过观察接口返回的布尔值，攻击者可判断服务器上任意文件或目录是否存在。该漏洞不会泄露文件内容。此问题已在版本 0.8.7 中修复。

CVSS 6.9 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
FOSSBilling FOSSBilling >= 0.1.0, < 0.8.7 affected
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I. Basic Information for CVE-2026-111053

Vulnerability Information
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Vulnerability Title
FOSSBilling: Unauthenticated attacker can probe existence of arbitrary files via guest/system/template_exists
Source: CVE Program / CVE List V5
Vulnerability Description
FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated api/guest/system/template_exists endpoint permits path traversal because templateExists uses Path::join on the attacker-controlled file parameter without rejecting .. sequences or verifying that the resolved path remains inside the active theme directory. The trigger is an unauthenticated request to guest/system/template_exists containing traversal sequences in the file parameter. An attacker can submit traversal sequences in the file parameter and observe the returned boolean to determine whether arbitrary files or directories exist on the server. The oracle does not disclose file contents. This issue is fixed in version 0.8.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FOSSBilling FOSSBilling >= 0.1.0, < 0.8.7 -

II. Public POCs for CVE-2026-111053

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III. Intelligence Information for CVE-2026-111053

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Patches & Fixes for CVE-2026-111053 (1)

Vendor Advisories for CVE-2026-111053 (1)

Vendor Pages for CVE-2026-111053 (1)

Same Patch Batch · FOSSBilling · 2026-10-19 · 3 CVEs total

CVE-2026-111056 6.9 MEDIUM FOSSBilling: Unauthenticated client account enumeration via guest signup endpoint
CVE-2026-111046 2.3 LOW FOSSBilling: Low-privileged staff can read and modify configuration of deactivated extensi

IV. Related Vulnerabilities

Same product: FOSSBilling
Same vendor: FOSSBilling
Same weakness: CWE-22

V. Comments for CVE-2026-111053

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