Stay updated on certificate-related infosec topics, including SSL/TLS, PKI, and digital certificate management for robust cyber security.
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Background for this topic.
Digital certificates are electronic documents that verify the ownership of a public cryptographic key by an individual, organization, or device. Issued by trusted Certificate Authorities (CAs) within a Public Key Infrastructure (PKI), certificates enable secure communication by confirming identities and supporting encryption protocols like TLS. They include information such as the subject’s name, public key, issuer, validity period, and digital signature from the CA.
Security concerns with certificates focus on risks like CA compromise or fraudulent issuance, which can allow attackers to impersonate legitimate entities and intercept or alter encrypted traffic. Expired or revoked certificates may cause connection failures or be exploited if clients do not properly validate them. Effective certificate lifecycle management—including timely renewal, revocation checking (via CRLs or OCSP), and monitoring for unauthorized certificates—is essential to maintaining trust and preventing man-in-the-middle attacks or unauthorized access.
Weekly headline count for the current query.
Cybersecurity researchers have attributed the April 2026 DigiCert security incident to a threat activity cluster dubbed CylindricalCanine
Pull the certificate off the flash of a Shark RV2320EDUS robot vacuum, and you can run root commands on other people's Shark vacuums across the same AWS region: watch the camera, drive the robot, read the map of the house, and take the Wi-Fi password in plaintext
Microsoft has released the Windows 10 KB5094127 extended security update, which fixes the June 2026 Patch Tuesday vulnerabilities and adds new functionality to monitor the rollout of updated Secure Boot certificates that replace those expiring this month. [...]
Check Point has warned of active exploitation of a critical vulnerability impacting Remote Access VPN and Mobile Access deployments that are configured to use the deprecated IKEv1 key exchange protocol
Cybersecurity researchers have discovered a malicious NuGet package that masquerades as a C# software development kit for Sicoob, one of Brazil's largest cooperative financial systems, to siphon client IDs and PFX certificates
Microsoft and Resecurity disrupted Fox Tempest, a malware-signing service that used fake Microsoft certificates to make malware look legitimate. Resecurity supported Microsoft’s Digital Crimes Unit (DCU) in its disruption of Fox Tempest, a financially motivated threat actor operating a malware-signing-as-a-service (MSaaS) capability used by cybercriminals to make malicious files appear legitimate. On May 19, 2026, […]
Microsoft says it has disrupted a malware-signing-as-a-service (MSaaS) operation that abused the company's Artifact Signing service to generate fraudulent code-signing certificates used by ransomware gangs and other cybercriminals. [...]
OpenAI says two employees' devices were breached in the recent TanStack supply chain attack that impacted hundreds of npm and PyPI packages, causing the company to rotate code-signing certificates for its applications as a precaution. [...]
A newly identified supply chain attack targeting DAEMON Tools software has compromised its installers to serve a malicious payload, according to findings from Kaspersky
Microsoft Defender is detecting legitimate DigiCert root certificates as Trojan:Win32/Cerdigent.A!dha, resulting in widespread false-positive alerts, and in some cases, removing certificates from Windows. [...]
The Secure Boot refresh is one of the largest coordinated security maintenance efforts across the Windows ecosystem, Microsoft said. In other words, update those PCs soon.
Cisco has released security updates to patch four critical vulnerabilities, including a fixed improper certificate validation flaw in the company's cloud-based Webex Services platform that requires further customer action. [...]
Cisco has announced patches to address four critical security flaws impacting Identity Services and Webex Services that could result in arbitrary code execution and allow an attacker to impersonate any user within the service
A critical vulnerability in the wolfSSL SSL/TLS library can weaken security via improper verification of the hash algorithm or its size when checking Elliptic Curve Digital Signature Algorithm (ECDSA) signatures. [...]
Google Sites lure leads to bogus root certificate Imagine getting asked to do something by a person in authority. An unknown malware slinger targeting open source software developers via Slack impersonated a real Linux Foundation official and used pages hosted on Google.com to steal developers' credentials and take over their systems.…
OpenAI is rotating potentially exposed macOS code-signing certificates after a GitHub Actions workflow executed a malicious Axios package during a recent supply chain attack. [...]
OpenAI revealed a GitHub Actions workflow used to sign its macOS apps led to the download of the malicious Axios library on March 31, but noted that no user data or internal system was compromised
Proponents Favor Performance Tests Over CertsThe U.S. Department of Defense is for the first time piloting new skills-based assessments for its cyber hiring as an alternative to checking paper qualifications. Many certificates, officials say, don't reflect the skills their cyber teams need in the real world.
Major providers are testing a quantum-safe version of HTTPS that shrinks certificates to one-tenth their previous size, decreasing latency and adding transparency.