CVE-2026-74774 Overview
CVE-2026-74774 is an Improper Certificate Validation vulnerability [CWE-295] affecting Dell PowerProtect One versions 20.1.0.0 and below. The flaw allows an unauthenticated remote attacker to bypass protection mechanisms that rely on certificate-based trust. Successful exploitation compromises the confidentiality of data transmitted between clients and the affected system. Dell disclosed the issue in security advisory DSA-2026-369 and released a corresponding update.
Critical Impact
An unauthenticated network attacker can bypass certificate validation to intercept or manipulate protected communications with Dell PowerProtect One appliances.
Affected Products
- Dell PowerProtect One version 20.1.0.0
- Dell PowerProtect One versions below 20.1.0.0
Discovery Timeline
- 2026-08-26 - CVE-2026-74774 published to NVD
- 2026-08-26 - Last updated in NVD database
Technical Details for CVE-2026-74774
Vulnerability Analysis
The vulnerability resides in the certificate validation logic used by Dell PowerProtect One. The product fails to properly verify the authenticity or integrity of X.509 certificates presented during Transport Layer Security (TLS) exchanges. An attacker positioned on the network can present a crafted or untrusted certificate that the appliance accepts as valid. This defeats the protection mechanism that certificate pinning or chain-of-trust validation is intended to enforce.
Because authentication is not required and the attack vector is network-based, exploitation can occur remotely. The scope is limited to confidentiality impact, meaning an attacker can read sensitive data in transit but cannot directly modify data or crash the service through this weakness alone. The high attack complexity reflects the need for the attacker to be in a suitable network position to intercept traffic.
Root Cause
The root cause is improper implementation of certificate validation routines, categorized under CWE-295: Improper Certificate Validation. The application does not correctly validate one or more elements of the certificate chain, such as hostname matching, chain-of-trust verification, or revocation status. This weakens the guarantees provided by TLS.
Attack Vector
An attacker with a man-in-the-middle position on the network path between a client and the PowerProtect One appliance can present a fraudulent certificate. The appliance accepts the certificate, establishing an encrypted channel with the attacker rather than the intended endpoint. The attacker then observes protected traffic in cleartext. Refer to the Dell Security Update DSA-2026-369 for vendor-specific technical details.
Detection Methods for CVE-2026-74774
Indicators of Compromise
- Unexpected TLS certificates presented on connections to or from PowerProtect One management interfaces.
- Anomalous network flows between PowerProtect One appliances and hosts outside the expected management network.
- TLS sessions negotiated with certificates signed by unrecognized or untrusted certificate authorities.
Detection Strategies
- Deploy TLS inspection at network egress points to log certificate fingerprints for all PowerProtect One traffic and alert on deviations from a known-good baseline.
- Monitor for ARP spoofing, rogue DHCP, or DNS redirection patterns near PowerProtect One appliances that indicate man-in-the-middle staging.
- Correlate authentication and configuration events on PowerProtect One with source IP anomalies to identify potential interception activity.
Monitoring Recommendations
- Enable verbose TLS logging on network devices adjacent to PowerProtect One and forward logs to a central SIEM for review.
- Baseline expected certificate issuers and Subject Alternative Names for the appliance and alert on any variation.
- Review firewall and switch logs for lateral traffic that could indicate an attacker positioning for interception.
How to Mitigate CVE-2026-74774
Immediate Actions Required
- Inventory all Dell PowerProtect One deployments and identify instances running version 20.1.0.0 or earlier.
- Apply the fixed version referenced in Dell advisory DSA-2026-369 as soon as maintenance windows allow.
- Restrict network access to PowerProtect One management interfaces to trusted administrative subnets only.
- Verify that certificates presented by the appliance are pinned or explicitly trusted by client systems.
Patch Information
Dell has published a fixed release in advisory DSA-2026-369. Administrators should upgrade PowerProtect One to a version above 20.1.0.0 as specified by Dell. Follow Dell's documented upgrade procedure to preserve backup catalog integrity during the update.
Workarounds
- Segment PowerProtect One appliances onto a dedicated, isolated management VLAN with strict access control lists.
- Enforce mutual TLS at network gateways where feasible to prevent presentation of unauthorized certificates.
- Disable or restrict any client integrations that cannot validate certificates until the patch is applied.
# Configuration example: restrict management access via firewall to trusted subnets
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
