Latest cybersecurity reporting from selected sources.

A new round of the weekly Security Affairs newsletter has arrived! Every week, the best security articles from Security Affairs are free in your email box. Enjoy a new round of the weekly SecurityAffairs newsletter, including the international press. U.S. CISA adds iCagenda and Balbooa Forms flaws to its Known Exploited Vulnerabilities catalog Critical U-Boot […]

KDDI Corporation disclosed a breach affecting up to 14.2 million email accounts after attackers exploited a vulnerability in third-party software. KDDI Corporation disclosed a data breach that exposed up to 14.2 million email accounts across six Japanese internet service providers. KDDI Corporation is one of Japan’s largest telecommunications companies. It employs more than 60,000 people […]

Meta confirms an AI tool vulnerability led to unauthorized access to Instagram accounts after a failure in email verification during password reset

A new round of the weekly Security Affairs newsletter has arrived! Every week, the best security articles from Security Affairs are free in your email box. Enjoy a new round of the weekly SecurityAffairs newsletter, including the international press. U.S. CISA adds SolarWinds Serv-U flaw to its Known Exploited Vulnerabilities catalog Report: Anthropic Deploys Engineers […]

Critical security vulnerabilities have been disclosed in SEPPMail Secure E-Mail Gateway, an enterprise-grade email security solution, that could be exploited to achieve remote code execution and enable an attacker to read arbitrary mails from the virtual appliance

Microsoft has disclosed a new security vulnerability impacting on-premise versions of Exchange Server that it said has come under active exploitation in the wild

Exim has released security updates to address a severe security issue affecting certain configurations that could enable memory corruption and potential code execution

In early January 2026, KrebsOnSecurity revealed how a security researcher disclosed a vulnerability that was used to assemble Kimwolf, the world's largest and most disruptive botnet. Since then, the person in control of Kimwolf -- who goes by the handle "Dort" -- has coordinated a barrage of distributed denial-of-service (DDoS), doxing and email flooding attacks against the researcher and this author, and more recently caused a SWAT team to be sent to the researcher's home. This post examines what is knowable about Dort based on public information.

Photo-sharing platform Flickr is notifying users of a potential data breach after a vulnerability at a third-party email service provider exposed their real names, email addresses, IP addresses, and account activity. [...]

SmarterTools has addressed two more security flaws in SmarterMail email software, including one critical security flaw that could result in arbitrary code execution

Trellix Says Email, Identify Failures Are Among Top Vectors in Health CompromisesOf the millions of threats detected in healthcare IT environments last year, email phishing, identity failures and device vulnerabilities were among the top vectors for non-clinical IT compromises - often "cascading" and disrupting patient care, said a new report from security firm Trellix.

Hackers began exploiting an authentication bypass vulnerability in SmarterTools' SmarterMail email server and collaboration tool that allows resetting admin passwords. [...]

A new security flaw in SmarterTools SmarterMail email software has come under active exploitation in the wild, two days after the release of a patch

Cisco on Thursday released security updates for a maximum-severity security flaw impacting Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager, nearly a month after the company disclosed that it had been exploited as a zero-day by a China-nexus advanced persistent threat (APT) actor codenamed UAT-9686

The Cyber Security Agency of Singapore (CSA) has issued a bulletin warning of a maximum-severity security flaw in SmarterTools SmarterMail email software that could be exploited to achieve remote code execution

No timeline for a patch Suspected Chinese-government-linked threat actors have been battering a maximum-severity Cisco AsyncOS zero-day vulnerability in some Secure Email Gateway (SEG) and Secure Email and Web Manager (SEWM) appliances for nearly a month, and there's no timeline for a fix.…

Zero-Click Vulnerability Let Attackers Weaponize Enterprise AI AssistantGoogle patched a vulnerability in Gemini Enterprise that allowed attackers to steal corporate data through a shared document, calendar invitation or email without any user action or security alerts. No malware was executed, no credentials were phished and no data left through approved channels.

A vulnerability in DoorDash's systems could allow anyone to send "official" DoorDash-themed emails right from company's authorized servers, paving a near-perfect phishing channel. DoorDash has now patched the issue, but a contentious disclosure dispute has erupted, with both sides accusing each other of acting in bad faith. [...]

Williams & Connolly Hit in Zero-Day Campaign Impacting Client EmailsA zero-day vulnerability was used to breach email accounts at the elite D.C. law firm Williams & Connolly, with officials reportedly suspecting the hack is part of a China-linked campaign targeting the U.S. legal sector to support espionage, steal intelligence and establish long-term access routes.

Libraesva has released a security update to address a vulnerability in its Email Security Gateway (ESG) solution that it said has been exploited by state-sponsored threat actors