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CVE-2026-40521

FrontAccounting < 2.4.20 Path Traversal RCE via attachment upload

Published: Jun 29, 2026Updated: Jun 30, 2026 Sources: CVE List NVDCWE-22
8.8HIGH
NVD MITRE
EPSS Score
0.6%
Top 53.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-22

Affected Products

FrontAccounting
commercialaka faplanet
FrontAccountingOn-prem
Enterprise Software / erp

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://jivasecurity.com/writeups/frontaccounting-rce-attachment-upload-cve-2026-40521
jivasecurity.com
https://sourceforge.net/p/frontaccounting/news/2026/04/release-2420/
sourceforge.net
https://github.com/FrontAccountingERP/FA/commit/701fea6848da4a02fb83d30f07a9c0473d6b7e33
github.com
and 1 more references View all →

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