← Vulnerability feed

Vulnerability record · CVE-2026-40521 · published 29 June 2026

CVE-2026-40521: Path traversal vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.98% · top 39.4% CWE-22 · Path traversal Deferred
8.7CVSS 4.0 base score
0.98%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
30 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/FrontAccountingERP/FA/commit/701fea6848da4a02fb83d30f07a9c0473d6b7e33
https://jivasecurity.com/writeups/frontaccounting-rce-attachment-upload-cve-2026-40521
https://sourceforge.net/p/frontaccounting/news/2026/04/release-2420/
https://www.vulncheck.com/advisories/frontaccounting-path-traversal-rce-via-attachment-upload

Track CVE-2026-40521 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-93616Checkpoint multi-domain security management path traversal vulnerabilityA directory traversal and file upload vulnerability allows an unauthenticated attacker to upload and execute arbitrary scripts on Check Point Managem…KEVEPSS 20%10.0CVE-2026-85706GitLab CE/EE repository commits API path traversal allows unauthenticated file readGitLab CE/EE contains improper path confinement and missing authentication enforcement in the repository commits API, allowing an unauthenticated use…KEVEPSS 91%analysed5.3CVE-2026-66384JFrog Artifactory path traversal in Docker cache pathAn authenticated user can write data outside the intended Docker cache path under specific remote-repository conditions in JFrog Artifactory. The fla…KEVEPSS 0.66%analysed9.8CVE-2026-59310VMware vCenter Syslog server path traversal leads to RCEVMware vCenter's Syslog server is affected by a directory traversal flaw (CWE-22) that allows a remote, unauthenticated attacker to execute arbitrary…KEVEPSS 2.6%analysed10.0CVE-2026-48282Adobe ColdFusion path traversal leads to remote code executionColdFusion versions 2025.9, 2023.20 and earlier contain a path traversal flaw (CWE-22) that allows an unauthenticated remote attacker to reach files …KEVEPSS 42%analysed10.0CVE-2026-34909UniFi OS path traversal allows unauthenticated file accessUniFi OS devices contain a path traversal flaw (CWE-22) that lets a network-reachable attacker read files on the underlying system. Because the expos…KEVEPSS 1.8%analysed6.5CVE-2026-20262Cisco Catalyst SD-WAN Manager path traversal in file uploadCisco Catalyst SD-WAN Manager (formerly vManage) fails to properly validate user-supplied input during a file upload process, allowing path traversal…KEVEPSS 28%analysed8.4CVE-2024-1708ConnectWise ScreenConnect path traversal enabling remote code executionConnectWise ScreenConnect 23.9.7 and earlier contain a path-traversal flaw (CWE-22) that can let an attacker execute remote code or reach confidentia…KEVEPSS 95%analysed

Source: NIST National Vulnerability Database (record CVE-2026-40521), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.