CVE-2025-2749 is a path traversal vulnerability in Kentico Kentico Xperience. CISA added it to the Known Exploited Vulnerabilities catalogue on 20 April 2026, which means attackers have used it in real attacks. Kentico Xperience contains a path traversal vulnerability that could allow an authenticated user’s Staging Sync Server to upload arbitrary data to path relative locations.
What this vulnerability means for Kentico Xperience
CVE-2025-2749 is a path traversal flaw, so the security concern is not just “file upload gone wrong”, but directory control being bypassed. In a product like Kentico Xperience, that can let an authenticated user steer data into path-relative locations the application did not intend, which raises the stakes from a simple validation bug to potential content tampering, file overwrite, or placement of data where it can later be executed or consumed unsafely.
The key practical issue is that path traversal defeats assumptions about where the Staging Sync Server may write. If a product accepts user-influenced paths without strict normalisation and allow-listing, the attacker may be able to move outside the intended directory boundary even though the request looks authenticated and “legitimate” at the application layer.
Why path traversal is dangerous in content management and sync features
Path traversal is especially risky in systems that synchronise content, templates, media, or deployment artefacts because those workflows are designed to move files across trusted locations. Once an attacker can influence the destination path, the same control plane that should preserve content integrity can become a write primitive for malicious placement or overwrite.
That danger is amplified when file writes affect web-accessible directories, configuration stores, or other locations that influence application behaviour. Even when the initial abuse is limited to arbitrary data placement, the downstream consequence can be much wider if that data is later parsed, rendered, or treated as trusted application state.
How organisations assess exposure and limit the blast radius
Exposure starts with knowing where Kentico Xperience is deployed, which environments expose staging functionality, and whether the affected interface is reachable from untrusted networks. Organisations should confirm version exposure against the vendor advisory and cross-check the CVE record in the CVE Program and the NIST National Vulnerability Database for authoritative record details and remediation guidance.
When patching is delayed, the practical goal is to narrow who can reach the staging path, restrict write destinations, and reduce the impact of any successful traversal. Strong application-layer validation, filesystem permission boundaries, and careful segmentation of staging services all matter because the weakness is about crossing a boundary the application was supposed to enforce.
Detection, remediation, and post-exploitation review
After remediation, teams should review whether the vulnerability was used before the fix was applied. For a path traversal issue, that means looking for unusual file creation, unexpected path patterns, modified staging artefacts, and any evidence that uploaded content landed outside the normal directory tree.
Because the initial exploit path involves file write control, the response should also examine whether the attacker used that write access to plant secondary payloads, alter configuration, or prepare later code execution. The broader lesson is that traversal bugs often begin as integrity issues, but they can become persistence or follow-on compromise issues if the written data is later trusted.
Risk and Threat Considerations
This vulnerability has a material threat dimension because it gives an attacker a way to abuse a trusted staging workflow and place data where the application did not intend. In a CMS or sync server, that kind of write access can be enough to corrupt content, seed malicious files, or create a foothold for follow-on abuse.
Failure mechanism: The application accepts a user-influenced path and fails to confine the write operation to an approved directory, so path normalisation and destination checks can be bypassed.
Impact: Attackers may overwrite files, plant malicious data, disturb content integrity, or set up later compromise if the written location is processed or executed by the platform.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8, NIST SP 800-53 Rev 5 and OWASP ASVS set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-16 — Application Software Security | Path traversal is an application flaw that security testing and remediation should catch. |
| Recommendation — Test file-handling paths and fix traversal flaws before release. | ||
| NIST SP 800-53 Rev 5 | SI-10 — Information Input Validation | The issue is caused by insufficient validation of path input used by the application. |
| AC-6 — Least Privilege | Limiting write privileges reduces the impact of a successful traversal write. | |
| Recommendation — Validate path input and reject values that escape approved directories. Restrict write permissions so a staging process can modify only intended locations. | ||
| OWASP ASVS | V5 File Handling — File Handling | Path traversal is a file-handling weakness that ASVS addresses directly. |
| Recommendation — Apply file-handling checks that confine writes to approved paths. | ||
| ISO/IEC 27001:2022 | A.8.28 — Secure coding | Secure coding controls address traversal-prone file and path handling logic. |
| Recommendation — Build and review path handling to prevent directory escape bugs. | ||
Practitioner Guidance
What to watch for: Treat any staging, import, export, or sync feature that writes to disk as a high-value boundary. The security question is not only whether the request is authenticated, but whether the server fully controls the destination path after normalisation.
Governance implication: Ownership should sit with the application and platform teams together, because filesystem permissions, application validation, and deployment hygiene all shape the real exposure. If those controls are split, path traversal bugs tend to survive longer and leave a wider blast radius.
Related resources from NHI Mgmt Group
- CVE-2025-34028 (Commvault Command Center Path Traversal)
- What breaks when React and Next.js applications expose the server-side deserialization path used in CVE-2025-55182?
- What are the signs that an application privilege escalation path like CVE-2025-2776 is being abused?
- CVE-2024-13161 (Ivanti Endpoint Manager (EPM) Absolute Path Traversal)