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CVE-2026-103521

Quick assessment

Affected
Thelia Thelia
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.

在 Thelia v2.6.0 中，文档上传端点正确阻止了可执行文件类型的上传，但文档更新端点未执行相同的验证。拥有管理权限的攻击者可以利用此漏洞上传任意可执行文件（例如恶意 PHP 脚本），从而在底层服务器上实现远程代码执行。

AI Predicted 9.8 Difficulty: Easy EPSS 0.47% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
Thelia Thelia ≤ 2.6.0 affected
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I. Basic Information for CVE-2026-103521

Vulnerability Information
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Vulnerability Title
CVE-2026-103521
Source: CVE Program / CVE List V5
Vulnerability Description
In Thelia v2.6.0, the document upload endpoint properly blocks the upload of executable file types, but the document update endpoint does not perform the same validation. An attacker with administrative Thelia permissions can exploit this vulnerability to upload arbitrary executable files, such as malicious PHP scripts, to achieve remote code execution on the underlying server.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Thelia Thelia 0 ~ 2.6.0 -

II. Public POCs for CVE-2026-103521

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III. Intelligence Information for CVE-2026-103521

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Vendor Advisories for CVE-2026-103521 (1)

Same Patch Batch · Thelia · 2026-10-12 · 13 CVEs total

CVE-2026-109397 7.2 HIGH Thelia before 3.1.2 and 3.2.x before 3.2.1 File Upload RCE via Filename Trailing Space
CVE-2026-109396 4.2 MEDIUM Thelia before 3.1.2 and 3.2.x before 3.2.1 CSV Formula Injection via Exports
CVE-2026-103524 CVE-2026-103524
CVE-2026-103523 CVE-2026-103523
CVE-2026-103522 CVE-2026-103522
CVE-2026-103526 CVE-2026-103526
CVE-2026-103529 CVE-2026-103529
CVE-2026-103537 CVE-2026-103537
CVE-2026-103528 CVE-2026-103528
CVE-2026-103527 CVE-2026-103527
CVE-2026-103535 CVE-2026-103535
CVE-2026-107248 CVE-2026-107248

IV. Related Vulnerabilities

Same product: Thelia
Same vendor: Thelia

V. Comments for CVE-2026-103521

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