Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
FrontAccounting FrontAccounting
Default version status: affected
0 to < 2.4.20affected701fea6848da4a02fb83d30f07a9c0473d6b7e33unaffected
References
- https://jivasecurity.com/writeups/frontaccounting-rce-attachment-upload-cve-2026-40521 ↗
- https://sourceforge.net/p/frontaccounting/news/2026/04/release-2420/ ↗
- https://github.com/FrontAccountingERP/FA/commit/701fea6848da4a02fb83d30f07a9c0473d6b7e33 ↗
- https://www.vulncheck.com/advisories/frontaccounting-path-traversal-rce-via-attachment-upload ↗