CVE-2026-5478 | wpeverest Everest Forms Plugin up to 3.4.4 on WordPress unlink old_files path traversal (EUVD-2026-23941)

VDB-358353 · CVE-2026-5478 · EUVD-2026-23941 WPEVEREST EVEREST FORMS PLUGIN UP TO 3.4.4 ON WORDPRESS UNLINK OLD_FILES PATH TRAVERSAL HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.7 $0-$5k 6.46 Summaryinfo A vulnerability identified as critical has been detected in wpeverest Everest Forms Plugin up to 3.4.4 on WordPress. The affected element is the function unlink. Performing a manipulation of the argument old_files results in path traversal. This vulnerability was named CVE-2026-5478. The attack may be initiated remotely. There is no available exploit. Detailsinfo A vulnerability classified as critical has been found in wpeverest Everest Forms Plugin up to 3.4.4 on WordPress. This affects the function unlink. The manipulation of the argument old_files with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is: The Everest Forms plugin for WordPress is vulnerable to Arbitrary File Read and Deletion in all versions up to, and including, 3.4.4. This is due to the plugin trusting attacker-controlled old_files data from public form submissions as legitimate server-side upload state, and converting attacker-supplied URLs into local filesystem paths using regex-based string replacement without canonicalization or directory boundary enforcement. This makes it possible for unauthenticated attackers to read arbitrary local files (e.g., wp-config.php) by injecting path-traversal payloads into the old_files upload field parameter, which are then attached to notification emails. The same path resolution is also used in the post-email cleanup routine, which calls unlink() on the resolved path, resulting in the targeted file being deleted after being attached. This can lead to full site compromise through disclosure of database credentials and authentication salts from wp-config.php, and denial of service through deletion of critical files. Prerequisite: The form must contain a file-upload or image-upload field, and disable storing entry information. The weakness was presented by ll. The advisory is shared at wordfence.com. This vulnerability is uniquely identified as CVE-2026-5478 since 04/03/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/20/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-23941). Productinfo Type WordPress Plugin Vendor wpeverest Name Everest Forms Plugin Version 3.4.0 3.4.1 3.4.2 3.4.3 3.4.4 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.8 VulDB Meta Temp Score: 6.7 VulDB Base Score: 5.6 VulDB Temp Score: 5.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.1 CNA Vector (Wordfence): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Path traversal CWE: CWE-22 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/03/2026 CVE reserved 04/20/2026 +17 days Advisory disclosed 04/20/2026 +0 days VulDB entry created 04/20/2026 +0 days VulDB entry last update Sourcesinfo Advisory: wordfence.com Researcher: ll Status: Not defined CVE: CVE-2026-5478 (🔒) GCVE (CVE): GCVE-0-2026-5478 GCVE (VulDB): GCVE-100-358353 EUVD: 🔒 Entryinfo Created: 04/20/2026 21:49 Updated: 04/20/2026 23:33 Changes: 04/20/2026 21:49 (66), 04/20/2026 23:33 (1) Complete: 🔍 Cache ID: 99:DCD:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸