CVE Advisory: Chained Progress ShareFile Vulnerabilities Allow Unauthenticated File Exfiltration

Affected Product: Progress ShareFile (enterprise secure file transfer solution)

Vulnerability Overview

Two vulnerabilities in Progress ShareFile can be chained together to achieve unauthenticated file exfiltration from affected enterprise environments. Progress ShareFile is a managed file transfer and content collaboration platform widely deployed across financial services, legal, healthcare, and government sectors — industries that routinely store sensitive documents, contracts, and regulated data within the platform.

The flaw chain does not require an attacker to hold valid credentials. An unauthenticated remote attacker can leverage the two weaknesses in sequence to access and extract files stored within a vulnerable ShareFile instance.

Technical Details

The attack chain combines two distinct vulnerability classes. The first weakness allows an unauthenticated attacker to bypass access controls at the application layer, circumventing authentication checks that would normally gate access to file resources. The second vulnerability enables direct file retrieval once that authentication barrier is bypassed, completing the exfiltration path.

This type of chained exploitation — where a lower-severity authentication bypass unlocks a higher-impact data access flaw — is a common pattern in managed file transfer software. The attack vector is network-based and remote, requiring no local access, no user interaction, and no prior foothold within the target environment. The attack surface is exposed wherever the ShareFile web interface or API endpoint is reachable, which in most enterprise deployments means it is accessible from the public internet.

Progress ShareFile has previously been a high-value target. CVE-2023-24489, a critical deserialization vulnerability in ShareFile Storage Zones Controller (CVSS 9.8), was exploited in the wild by the Cl0p ransomware group in 2023 as part of a broader campaign targeting managed file transfer platforms, alongside vulnerabilities in MOVEit Transfer and GoAnywhere MFT. The current chained flaw set continues that pattern of attacker focus on MFT infrastructure.

Real-World Impact

File exfiltration from ShareFile environments carries direct consequences for organizations subject to HIPAA, PCI-DSS, GDPR, and SOX. ShareFile instances frequently contain executed contracts, financial statements, HR records, client data packages, and other high-sensitivity materials transferred between internal teams and external parties.

Because exploitation requires no authentication, the attack can be executed by any threat actor with network access to the ShareFile endpoint — including opportunistic scanners, ransomware affiliate groups, and state-sponsored actors. There is no social engineering component required; the attack is fully technical and can be automated at scale.

Organizations that use ShareFile in hybrid configurations — where the Storage Zones Controller is self-hosted on-premises — face elevated risk because patching depends on internal patch management cadences rather than automatic updates from Progress. Cloud-hosted ShareFile tenants managed entirely by Progress may receive patches on a different timeline, but administrators should confirm their deployment model and patch status regardless.

Data exfiltrated through this vulnerability chain could be used for extortion, sold on criminal marketplaces, or leveraged in follow-on spear-phishing campaigns targeting the employees and clients whose files were accessed.

Patching and Mitigation Guidance

1. Apply vendor patches immediately. Monitor the Progress ShareFile Security Advisories page for official CVE assignments, patch releases, and affected version ranges. Apply any available updates to Storage Zones Controller and ShareFile-managed components without delay.

2. Identify your deployment model. Determine whether your ShareFile environment uses Progress-hosted storage, self-hosted Storage Zones Controller, or a hybrid configuration. Self-hosted components require manual patching; confirm version numbers against the vendor advisory.

3. Restrict network exposure. If the ShareFile interface or Storage Zones Controller API does not require public internet accessibility for all users, place it behind a VPN or restrict source IP ranges at the firewall or load balancer level. Reducing the attack surface limits opportunistic exploitation.

4. Audit access logs. Review ShareFile access logs for anomalous file download activity, particularly bulk downloads, access from unexpected IP ranges, or access patterns that do not correlate with known user behavior. Baseline normal usage before the vulnerability was disclosed to identify potential prior exploitation.

5. Enable alerting on file access anomalies. If your SIEM ingests ShareFile logs, create detection rules for high-volume file access events from unauthenticated or low-privilege sessions, and for API calls associated with file retrieval endpoints.

6. Check for indicators of compromise. Given the history of Cl0p and similar groups targeting MFT platforms, correlate any suspicious ShareFile activity with known threat actor infrastructure using current threat intelligence feeds.

Organizations that cannot patch immediately should treat network-level restriction of the ShareFile endpoint as a mandatory compensating control until the patch is applied.