Cybercriminals are abusing a widespread lack of authentication in the customer service platform Zendesk to flood targeted email inboxes with menacing messages that come from hundreds of Zendesk corporate customers simultaneously.

Zendesk is an automated help desk service designed to make it simple for people to contact companies for customer support issues. Earlier this week, KrebsOnSecurity started receiving thousands of ticket creation notification messages through Zendesk in rapid succession, each bearing the name of different Zendesk customers, such as CapCom, CompTIA, Discord, GMAC, NordVPN, The Washington Post, and Tinder.

The abusive missives sent via Zendesk’s platform can include any subject line chosen by the abusers. In my case, the messages variously warned about a supposed law enforcement investigation involving KrebsOnSecurity.com, or else contained personal insults.

Moreover, the automated messages that are sent out from this type of abuse all come from customer domain names — not from Zendesk. In the example below, replying to any of the junk customer support responses from The Washington Post’s Zendesk installation shows the reply-to address is help@washpost.com.

Notified about the mass abuse of their platform, Zendesk said the emails were ticket creation notifications from customer accounts that configured their Zendesk instance to allow anyone to submit support requests — including anonymous users.

“These types of support tickets can be part of a customer’s workflow, where a prior verification is not required to allow them to engage and make use of the Support capabilities,” said Carolyn Camoens, communications director at Zendesk. “Although we recommend our customers to permit only verified users to submit tickets, some Zendesk customers prefer to use an anonymous environment to allow for tickets to be created due to various business reasons.”

Camoens said requests that can be submitted in an anonymous manner can also make use of an email address of the submitter’s choice.

“However, this method can also be used for spam requests to be created on behalf of third party email addresses,” Camoens said. “If an account has enabled the auto-responder trigger based on ticket creation, then this allows for the ticket notification email to be sent from our customer’s accounts to these third parties. The notification will also include the Subject added by the creator of these tickets.”

Zendesk claims it uses rate limits to prevent a high volume of requests from being created at once, but those limits did not stop Zendesk customers from flooding my inbox with thousands of messages in just a few hours.

“We recognize that our systems were leveraged against you in a distributed, many-against-one manner,” Camoens said. “We are actively investigating additional preventive measures. We are also advising customers experiencing this type of activity to follow our general security best practices and configure an authenticated ticket creation workflow.”

In all of the cases above, the messaging abuse would not have been possible if Zendesk customers validated support request email addresses prior to sending responses. Failing to do so may make it easier for Zendesk clients to handle customer support requests, but it also allows ne’er-do-wells to sully the sender’s brand in service of disruptive and malicious email floods.

APPLE By Will Fastie> Now that Apple’s “OS 26” versions are out, I decided to examine Apple’s macOS update process on my Mac mini, now named “Orchard.” There was one thing in particular I wanted to check out, which I’ll detail at the end of the article. In general, my purpose was to see how […]

MacStadium's inaugural CIO survey shows Apple devices gaining major ground in U.S. enterprises, with 96% of CIOs expecting Mac fleets to expand in the next two years and Macs already representing an average of 65% of enterprise endpoints. "The results show rapid Mac deployment across US business in the last two years, with 93% of CIOs claiming increased use, and 59% claiming a significant increase in use of all Apple devices," adds Computerworld. From the report: "As the adoption of Apple hardware continues to rise with both consumers and business users, and Apple Silicon is emerging as a secure and energy-efficient option for AI workloads, Apple is turning its sights to the enterprise," [MacStadium CEO Ken Tacelli] said in an interview. Among the specifics: - 93% of CIOs report increased Apple device usage over the past two years. - 45% of CIOs describe their leadership's view of Macs as a strategic investment, reflecting growing executive-level buy-in. - The top drivers for Apple adoption are security and privacy (59%), employee preference (59%), and hardware performance (54%). - Perhaps most importantly, 65% of CIOs say Macs are easier to manage than Windows or Linux devices. In addition to those factors, the unique technical capabilities of Apple's kit (53%) play a role. Businesses are buying Macs because they're cheaper to run, last longer, allow employees to be more productive, and are both more private and more secure. The survey also shows that AI has become a leading reason to choose Macs. Apple Silicon is highly performant and energy efficient, enabling Macs to run on-device, secure AI, and to access cloud-based AI services.

Read more of this story at Slashdot.

Apple’s latest operating systems for its most popular devices — iPhones, iPads and Macs — include patches for multiple vulnerabilities, but the company didn’t issue any warnings about active exploitation. 

Apple patched 27 defects with the release of iOS 26 and iPadOS 26 and 77 vulnerabilities with the release of macOS 26, including some bugs that affected software across all three devices. Apple’s new operating systems, which are now numbered for the year of their release, were published Monday as the company prepares to ship new iPhones later this week.

Users that don’t want to upgrade to the latest versions, which adopt a translucent design style Apple dubs “liquid glass,” can patch the most serious vulnerabilities by updating to iOS 18.7 and iPad 18.7 or macOS 15.7. Most Apple devices released in 2019 or earlier are not supported by the latest operating systems.

None of the vulnerabilities Apple disclosed this week appear to be under active attack, Dustin Childs, head of threat awareness at Trend Micro’s Zero Day Initiative, told CyberScoop.

Apple previously issued an emergency software update to customers last month to patch a zero-day vulnerability — CVE-2025-43300 — that was “exploited in an extremely sophisticated attack against specific targeted individuals,” the company said in a series of updates for iOS, iPadOS and macOS.

The company has addressed five actively exploited zero-days this year, including defects previously disclosed in January, February, March and April. Seven Apple vulnerabilities have been added to the Cybersecurity and Infrastructure Security Agency’s known exploited vulnerabilities catalog this year. 

Unlike many vendors, Apple doesn’t provide details about the severity of vulnerabilities it addresses in software updates. Childs noted it would be helpful if Apple issued some sort of initial severity indicator alongside the vulnerabilities it patches — even if it doesn’t follow the Common Vulnerability Scoring System.

A pair of vulnerabilities patched in macOS — CVE-2025-43298, which affects PackageKit, and CVE-2025-43304, which affects StorageKit — are concerning because exploitation could allow an attacker to gain root privileges, Childs said. 

“On the iOS side, I don’t see anything that makes me sweat immediately but there are a lot of bugs addressed,” he added.

Apple also patched seven defects in Safari 26, 19 vulnerabilities in watchOS 26, 18 bugs in visionOS 26 and five defects in Xcode 26. 

More information about the vulnerabilities and latest software versions are available on Apple’s security releases site.

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David Fletcher // Recently we were involved in an engagement where we expected to see a large number of Macs in the target environment. As an element of the engagement […]

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