CVE-2026-40521

Summary

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 Software

VendorProductVersion RangeStatus
FrontAccountingFrontAccounting0 < 2.4.20affected
FrontAccountingFrontAccounting701fea6848da4a02fb83d30f07a9c0473d6b7e33unaffected

Weaknesses

  • CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: total

References