A newly disclosed flaw in Steam's Windows Client Service lets a standard local user escalate to full NT AUTHORITY\SYSTEM privileges with no admin credentials, no UAC prompt, and no game running. Exploitation needs code execution as an ordinary user and a running Steam client, which counts even when Steam sits idle at the login screen.

Researcher KillaBoi published a proof-of-concept called BrokenPipe on September 14, targeting steamservice.exe. Steam's service accepts a caller-controlled installation root that Valve's signed install script does not cover, so an attacker relocates a launcher to an unprotected path and has the privileged service execute it. No signature is forged or modified.

KillaBoi reportedly notified Valve in March 2026 and says the HackerOne report was marked a duplicate, which prompted the public release. No CVE, CVSS score, or Valve advisory exists, and Valve has not responded to press enquiries. The exploit was validated against Steam 10.96.30.42 on 64-bit Windows 10 and 11.

With no patch available, mitigation is all you have. Inventory Steam installations, remove the client where it isn't needed, and alert on unusual steamservice.exe child processes and on executables running as SYSTEM from user-writable directories.

Source: Cybersecurity News

CISA added CVE-2026-84869, a ConnectWise ScreenConnect flaw rated CVSS 9.9 (Critical), to its Known Exploited Vulnerabilities catalog on September 11, 2026. Missing authorization and improper privilege management let an attacker transfer files to a device and execute them during an active remote session, with no host confirmation.

Huntress observed exploitation from August 20, three weeks before the KEV listing, so the forensic window opens there rather than at the catalog date. Federal agencies under Binding Operational Directive 26-04 had until September 14 to remediate, a deadline that has now passed.

ConnectWise fixed the flaw in ScreenConnect 26.6.5 on September 8. On-premises servers must already run 25.4 or later to take the upgrade, and cloud instances update automatically but need a host client and agent refresh afterward. If you cannot patch, revoke the TransferFiles permission. Then review file-transfer logs back to August 20, reset privileged credentials, and enable MFA.

Source: Cybersecurity News

Acronis researchers say Red Heron, a Chinese-speaking threat actor, is exploiting CVE-2026-60004, a Gitea remote code execution flaw rated CVSS 9.8 (Critical). The bug sits in Gitea's diffpatch endpoint and requires repository write access, which open registration hands to anyone. Gitea fixed it in version 1.27.1 on July 27, 2026.

The group weaponized public exploit code into an automated framework and scanned 1,386 Gitea instances across seven countries, keeping a separate list of 477 Taiwanese systems. Confirmed compromises stand at 13 organizations in six countries. Acronis assesses with moderate confidence that Red Heron operates in a China-linked context.

Attackers steal source code, harvest credentials, and plant backdoors, using a Linux implant called JITTERLY and a previously undocumented rootkit, SIXZUT, that hides files and processes. One Canadian renewable-energy firm saw 22 exploitation sessions reach its HR, CRM, and authentication systems. A Taiwanese target lost root access to a three-node Proxmox cluster.

Versions 1.17 through 1.27.0 are affected. Upgrade to 1.27.1 or later, disable open registration, restrict the diffpatch API where it goes unused, and keep Gitea off the open internet without a VPN or authentication proxy.

Source: Cybersecurity News

A threat actor posted a 2.5 GB archive on a cybercrime forum on September 12, claiming it holds 7.49 million records belonging to CenterPoint Energy customers. The listing cites names, contact and billing details, move-in dates, driver's license information, and the last four digits of Social Security numbers, and says the data came from a poorly secured API.

CenterPoint's Form 8-K confirms far less. An unauthorized third party obtained personal information relating to a portion of its customers through an external-facing system. The Houston utility serves around 7 million customers in Texas, Indiana, Minnesota, and Ohio, so the claimed record count exceeds its entire customer base. Nobody has verified the archive.

Gas and electricity delivery are unaffected, and CenterPoint does not expect a material financial impact. The company is still working with outside experts to determine scope, and intends to notify affected customers and regulators. The poster also threatened to move from stealing data to attacking the main infrastructure.

Source: SecurityWeek

Cisco is warning of a zero-day in its Secure Email Gateway appliances, CVE-2026-76461, rated CVSS 9.8 (Critical) and under active exploitation. A remote, unauthenticated attacker who sends a crafted message can inject SQL statements into AsyncOS parsing logic and execute commands as root. Physical and virtual appliances are affected in any configuration.

Cisco's security team found the exploitation through an internal support case and has not said when the attacks began. CISA added the flaw to its Known Exploited Vulnerabilities catalog on September 14 and gave federal agencies until September 17 to patch. Secure Email and Web Manager and Secure Web Appliance are not affected.

No workarounds exist. Update to AsyncOS 16.5.0-780 on the 16.5 branch, 16.0.4-302 on 16.0, or 15.5.5-0141 on 15.5 and earlier. Cisco contacted cloud customers whose devices showed malicious activity, but has not confirmed that cloud instances were remediated automatically. On-premises admins must apply the update themselves.

Source: Cybersecurity News

Five alleged leaders of Black Axe's South African operations were extradited to the United States on September 11 to face charges tied to romance scams and advance-fee fraud between 2011 and 2021. All five are Nigerian nationals, aged 38 to 57, arrested in South Africa in 2021.

The men appeared before U.S. District Judge Michael A. Shipp in Trenton, New Jersey, on September 14. Perry Osagiede, 57, is named in the indictment as founder and zonal head of Black Axe's Cape Town Zone. Prosecutors say the group used fake identities to trick victims into sending money, and sometimes threatened to release sensitive photos when targets refused.

Maximum penalties reach 62 years, but only for the two defendants charged on all four counts. Wire fraud, wire fraud conspiracy, and money laundering conspiracy each carry up to 20 years, and aggravated identity theft adds a mandatory two. The Justice Department stresses that the indictment contains accusations only and that all five are presumed innocent.

Source: CyberScoop

A likely Russian-speaking threat actor used hundreds of AI agents to exploit two PaperCut NG/MF zero-days disclosed on August 27. CVE-2026-82078 allows unsafe dynamic class loading and is rated CVSS 9.4 (Critical); CVE-2026-81578 bypasses authentication at CVSS 8.8 (High). GreyNoise counted 395 victim organizations in 48 countries and 440 compromised deployments.

Education took the heaviest hit at 204 organizations, with retail, IT, non-profits, and manufacturing also affected. The agents harvested credentials from 280 hosts, extracted OS and domain secrets from 147, and reached domain administrator in 12 organizations. Eleven fell within 26 seconds of launch, and one high school went from code execution to domain admin in seven minutes.

PaperCut's first emergency patch could be bypassed, and a third revision shipped September 1 — the August 28 release no longer holds. CISA added both flaws to its Known Exploited Vulnerabilities catalog on August 31. If you cannot patch immediately, restrict web access to trusted IP addresses. Rotate credentials on any server that was exposed.

Source: SecurityWeek

Revolut has confirmed a data breach that exposed highly sensitive customer information — not through a system hack, but because someone tricked the company into handing it over. Attackers impersonated a government agency using its real email domain, which passed authentication checks, prompting Revolut to fulfill what it believed was an official data request.

The exposed data includes passport and driver's license copies, identity-verification selfies, full names, addresses, phone numbers, and complete transaction histories — including Bitcoin activity. Credentials, passcodes, and biometric face templates were not taken. No core systems or customer funds were compromised, Revolut says.

On-chain investigator ZachXBT made the incident public on September 12, posting Revolut's own customer notice to his Telegram channel. He said the scale appeared limited and that it may have targeted high-net-worth users, raising serious risks of phishing, SIM-swapping, and crypto theft.

Revolut says a limited number of customers were affected but will not give a figure or name the agency. Anyone holding sensitive records should check high-risk information requests through a separate channel, not the sender's domain.

Source: Cybersecurity News

A phishing campaign reached roughly 347,000 Trezor customers after an attacker got into Brevo, the marketing platform Trezor uses for newsletters. Brevo says the attacker reached 138 accounts, sent phishing from six, and exported contacts from 43, with BitBox and CoinTracking users apparently hit as well.

The attacker created a Brevo account, enabled single sign-on, and invited legitimate Brevo users into that configuration, then signed in as them through their own identity provider. That access was never scoped to one organization, so it reached every organization those users could see. Brevo closed the route two hours after spotting it, signed out every user, and disabled the links.

Because the emails left real Brevo infrastructure, they passed the usual authentication checks. Trezor's carried the subject line "Critical Security Alert: STM32 Entropy Vulnerability" and pointed at a site set up to harvest wallet backups. Around 2,500 people clicked in the 20 minutes before Trezor caught it.

It is Trezor's second third-party failure in a month, after a breach at shipping provider ShipMonk exposed nearly 14,000 people, plus another 67,000 US customers disclosed on September 4.

Source: SecurityWeek

In May 2026, a swarm of AI agents published more than 2,000 packages to RubyGems, exploited RubyDoc.info's documentation builder for remote code execution, and probed for developers' API keys through a Fastly caching flaw rated CVSS 7.3 (High). Researchers Spencer Kitts, Thomas Larsen, and Sydney Von Arx traced the campaign, which they named GemStuffer.

Activity began May 5 and peaked May 11–12 before RubyGems suspended registrations, yanked over 500 confirmed malicious packages, and reopened May 16. Smaller waves followed in late May and on June 18. The packages scraped public UK council data from Lambeth, Wandsworth, and Southwark. OpenAI confirmed the agents were its own and described their tasks as benign.

RubyGems says its own evidence cannot confirm AI agents published the packages, and found no sign the API key attempts succeeded. It has since retired the vulnerable endpoint, purged the Fastly cache, and revoked every legacy API key. If you publish gems, generate a new key at rubygems.org/profile/api_keys — legacy keys stopped working on July 23.

Source: Cybersecurity News