PT-2026-53268 · Frontaccounting · Frontaccounting

Jiva · Published 2026-06-29 · Updated 2026-06-29 · CVE-2026-40521

NVD

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

FrontAccounting before 2.4.20 contains a path traversal vulnerability in the attachment upload handler that allows authenticated attackers to execute arbitrary code by uploading files with traversal sequences in the unique name parameter. Attackers can supply path traversal sequences ../../../shell.php to write files outside the intended attachments directory into the web root, and by uploading PHP files without extension validation, achieve remote code execution as the web server user.

Exploit

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-40521

Affected Products

Frontaccounting

References · 5

• 🔥 https://jivasecurity.com/writeups/frontaccounting-rce-attachment-upload-cve-2026-40521 · Exploit
• https://github.com/FrontAccountingERP/FA/commit/701fea6848da4a02fb83d30f07a9c0473d6b7e33 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-40521 · Security Note
• https://vulncheck.com/advisories/frontaccounting-path-traversal-rce-via-attachment-upload · Note
• https://sourceforge.net/p/frontaccounting/news/2026/04/release-2420 · Note