Unrestricted File Upload in Swiss Toolkit For WP (WordPress plugin) (CVE-2026-2354)
Summary
Vulnerability in Swiss Toolkit For WP (WordPress plugin) (CVE-2026-2354). Successful exploitation can lead to full system takeover. Exploitable via wp_check_filetype_and_ext.
Original description
The description as published by the source.
The Swiss Toolkit For WP plugin for WordPress is vulnerable to arbitrary file upload due to a flawed file type validation bypass in the upload_extension_files() function in all versions up to, and including, 1.4.6. The upload_extension_files() function hooks into WordPress's wp_check_filetype_and_ext filter and uses strpos() to check if a filename contains a configured extension string, rather than verifying the actual file extension. This makes it possible for authenticated attackers, with Author-level access and above, to upload arbitrary files (including PHP) on the affected site's server which may make remote code execution possible, granted the "Enhanced Multi-Format Image Support" feature is enabled with at least one extension (e.g., avif) in the allowed formats.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-2354 has been found in Swiss Toolkit For WP (WordPress plugin).
Attackers can target a specific entry point like wp_check_filetype_and_ext over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Swiss Toolkit For WP (WordPress plugin) CVE-2026-2354" on the vendor's site.
CVE-2026-2354 (Swiss Toolkit For WP (WordPress plugin)) — CWE-434 / CVSS v3 8.8
Attack vector: remote (network-reachable) / no user interaction
Attack surface: wp_check_filetype_and_ext
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-434) exists in Swiss Toolkit For WP (WordPress plugin). Attackers reach the vulnerable code path via wp_check_filetype_and_ext.
Check the vendor advisory for the affected versions of Swiss Toolkit For WP (WordPress plugin). Attack surface: wp_check_filetype_and_ext.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Swiss Toolkit For WP (WordPress plugin) を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- web nvd.nist.gov
- web security@wordfence.com
- web security@wordfence.com
- web security@wordfence.com
- web security@wordfence.com
- web security@wordfence.com
- web github.com