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CVE-2026-100713— Froxlor before 2.3.12 Privilege Escalation via SSH Key Sync

Quick assessment

Affected
froxlor froxlor
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.

Froxlor 2.3.10 及更早版本中存在一个时间检查到使用时间（TOCTOU，Time-of-Check Time-of-Use）竞态条件漏洞，位于 SSH 密钥同步定时任务中（代码位置： 的 方法）。 在检查阶段， / 会对目录和符号链接进行验证；但在实际写入阶段，系统会以 root 权限重新解析实际的文件系统路径，并执行文件写入操作（使用 配合 标志），随后执行 、 和 操作。在检查与写入之间，系统还涉及数据库往返操作和文件读取，且未对路径或文件描述符进行锁定（未使用 或 等机制防止符号链接替换）。 在启

CVSS 7.8 · High EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-100713

Vulnerability Information
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Vulnerability Title
Froxlor before 2.3.12 Privilege Escalation via SSH Key Sync
Source: CVE Program / CVE List V5
Vulnerability Description
Froxlor 2.3.10 and earlier contain a time-of-check time-of-use (TOCTOU) race condition in the SSH key synchronization cron (lib/Froxlor/Cron/System/SshKeys.php, SshKeys::generateFiles). The containment/symlink validation performed by FileDir::makeCorrectDir()/makeCorrectFile() is done only at check time; the live filesystem path is re-resolved as root at write time (file_put_contents with FILE_APPEND|LOCK_EX, followed by chmod/chown/chgrp), with a database round-trip and file reads in between, and no path or file-descriptor pinning (no O_NOFOLLOW or openat2(RESOLVE_NO_SYMLINKS)). On installations where the non-default setting system.allow_customer_shell=1 grants customers local shell access, a customer can atomically swap their ~/.ssh directory for a symlink after the check and before the write, causing the root-run cron to append the customer's public key to /root/.ssh/authorized_keys and to chown /root/.ssh to the customer, resulting in full root compromise of the panel host. The cron re-runs on every interval, allowing unlimited attempts. This is a residual race that bypasses the check-time fix introduced for GHSA-mq5v-... . The issue is fixed in Froxlor 2.3.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
froxlor froxlor 0 ~ 2.3.12 -

II. Public POCs for CVE-2026-100713

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III. Intelligence Information for CVE-2026-100713

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Vendor Advisories for CVE-2026-100713 (1)

Other References for CVE-2026-100713 (1)

Same Patch Batch · froxlor · 2026-09-26 · 13 CVEs total

CVE-2026-100717 9.9 CRITICAL froxlor before 2.3.12 CRLF Injection via validateUrl userinfo
CVE-2026-100716 9.9 CRITICAL Froxlor before 2.3.12 Privilege Escalation via Symlink
CVE-2026-100715 9.6 CRITICAL Froxlor before 2.3.12 Arbitrary File Deletion via Symlink
CVE-2026-100714 9.1 CRITICAL Froxlor before 2.3.12 Command Injection via letsencryptchallengepath
CVE-2026-100720 8.7 HIGH Froxlor before 2.3.12 Stored XSS via SSL certificate issuer
CVE-2026-100711 7.5 HIGH froxlor before 2.3.12 Authentication Bypass via Session Persistence
CVE-2026-100709 7.5 HIGH Froxlor before 2.3.12 2FA Bypass via Namespace Confusion
CVE-2026-100718 7.1 HIGH Froxlor before 2.3.12 Authentication Bypass via EmailSender.add
CVE-2026-100708 7.1 HIGH Froxlor before 2.3.13 Private Key Disclosure via Certificates API
CVE-2026-100712 6.5 MEDIUM froxlor before 2.3.12 Two-Factor Authentication Bypass via CSRF
CVE-2026-100719 6.5 MEDIUM Froxlor before 2.3.12 Credential Disclosure via DirProtections API
CVE-2026-100710 4.9 MEDIUM Froxlor before 2.3.12 DKIM Private Key Disclosure via API

IV. Related Vulnerabilities

Same product: froxlor
Same vendor: froxlor
Same weakness: CWE-367

V. Comments for CVE-2026-100713

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