CVE-2025-2749: Kentico Xperience Path Traversal Vulnerability

CVE-2025-2749: Kentico Xperience Path Traversal Added to CISA KEV

Kentico Xperience, a widely deployed .NET content management platform, has been flagged by the U.S. Cybersecurity and Infrastructure Security Agency (CISA) for an actively exploited path traversal vulnerability tracked as CVE-2025-2749. The agency added the flaw to its Known Exploited Vulnerabilities (KEV) Catalog on April 20, 2026, confirming in-the-wild exploitation and mandating remediation for federal civilian agencies.

The vulnerability resides in Kentico Xperience's Staging Sync Server — a component designed to synchronize content objects between environments (development, staging, production). A flaw in path handling allows an authenticated user to upload arbitrary data to path-relative locations outside the intended directory boundary, a classic directory traversal condition that can be abused to overwrite sensitive files or plant attacker-controlled content.

Vulnerability Details

Technical Analysis

Root Cause

The vulnerability is rooted in CWE-22 (Path Traversal) — a failure to sanitize user-controlled path components before performing file system operations. The Staging Sync Server accepts data payloads that include destination path information, and the application does not adequately resolve or restrict these paths against a base directory before writing.

An authenticated attacker can craft a staging sync request that includes directory traversal sequences (e.g., ../, encoded variants) in the destination path parameter. Because the path is not normalized or bounded before the write operation, the server will:

1. Accept the crafted staging payload
2. Resolve the traversal sequences relative to the Staging Sync Server's working directory
3. Write the attacker-controlled data to an arbitrary filesystem location accessible by the application process

Impact Scenarios

Depending on filesystem permissions and server configuration, successful exploitation can lead to:

The requirement for authentication places a meaningful prerequisite on exploitability — however, in enterprise CMS environments, low-privilege authenticated users (editors, contributors, or compromised accounts) may have access to staging functionality, significantly expanding the effective attack surface.

Affected Products

Organizations running Kentico Xperience with the Staging Sync Server feature enabled and exposed should treat this as high priority regardless of authentication controls.

CISA KEV Catalog Entry

CISA added CVE-2025-2749 to the KEV Catalog on April 20, 2026. The entry confirms:

• Exploitation status: Active exploitation confirmed in the wild
• Required action: Apply mitigations per Kentico vendor instructions or discontinue use if mitigations are unavailable
• FCEB deadline: Per standard KEV timelines — Federal Civilian Executive Branch agencies must remediate under Binding Operational Directive (BOD) 22-01

While BOD 22-01 applies to federal agencies, CISA recommends all organizations using Kentico Xperience apply available patches immediately.

Remediation

Immediate Actions

1. Apply Kentico's security patch — Update Kentico Xperience to the latest patched version as specified in Kentico's security advisory
2. Restrict Staging Sync Server access — If staging synchronization is not required or can be temporarily disabled, restrict or disable the Staging Sync Server endpoint at the network/application level
3. Audit recent staging activity — Review Staging Sync Server logs for unusual upload patterns, unexpected file paths, or requests from unauthorized users

Defense in Depth

- Enforce least-privilege: Restrict staging sync permissions to only required users
- Network segmentation: Staging Sync endpoints should not be internet-facing
- File integrity monitoring: Monitor web root and config directories for unexpected changes
- WAF rules: Add path traversal detection rules for requests targeting staging endpoints

Checking for Indicators of Compromise

Defenders should inspect the filesystem for:

# Look for unexpected .aspx or .ashx files in web-accessible directories
find /path/to/webroot -name "*.aspx" -newer /var/log/last-known-clean-date
find /path/to/webroot -name "*.ashx" -newer /var/log/last-known-clean-date
 
# Review IIS/web server access logs for staging endpoint POST requests
# with path traversal sequences
grep -E "staging.*\.\./|%2e%2e" /var/log/iis/access.log

About Kentico Staging Sync

Kentico Xperience's Staging module is designed to replicate content, settings, and media between Kentico environments in multi-tier deployment architectures. The Staging Sync Server receives objects from source environments and writes them to the local site. Because the functionality is inherently file-write capable by design, path handling bugs in this component carry elevated risk.

Key Takeaways

1. CVE-2025-2749 is a path traversal flaw in Kentico Xperience's Staging Sync Server — added to CISA KEV on April 20, 2026
2. An authenticated attacker can upload arbitrary data to attacker-controlled file paths, potentially enabling web shell deployment or configuration tampering
3. Apply Kentico's security patch immediately — prioritize systems where the Staging Sync Server is network-accessible
4. If immediate patching is not possible, disable or restrict Staging Sync Server access as an interim measure
5. Audit recent staging activity for signs of unauthorized file writes

Sources

• NVD — CVE-2025-2749
• CISA Known Exploited Vulnerabilities Catalog
• Kentico Security Advisories