elevation Archives

Winsage

September 10, 2026

CVE-2026-85880 and CVE-2026-81963: Microsoft Patches Two Actively Exploited Windows Zero-Days

Microsoft's Patch Tuesday on September 8, 2026, addressed two critical Windows privilege escalation vulnerabilities: CVE-2026-85880 and CVE-2026-81963, both with a CVSS score of 7.8. CVE-2026-85880 is a heap-based buffer overflow in the Windows Advanced Local Procedure Call (ALPC), allowing attackers with low-privilege local access to escalate privileges to SYSTEM. CVE-2026-81963 involves improper link resolution in the Windows Update Stack, enabling similar privilege escalation. Both vulnerabilities require no user interaction and have been actively exploited prior to the patch release. CISA added them to its Known Exploited Vulnerabilities catalog on September 8, 2026, with a remediation deadline of September 22 for U.S. federal agencies. CVE-2026-85880 affects various Windows 10 and Server versions but excludes Windows 11 and Windows Server 2025. CVE-2026-81963 impacts newer Windows platforms, including Windows 11 and Windows Server 2025. Microsoft released security updates for both vulnerabilities on September 8, 2026, and organizations are advised to prioritize these updates. Security teams should monitor for signs of privilege escalation and unusual SYSTEM-level activities related to these vulnerabilities.

Winsage

September 9, 2026

Microsoft Patches Record 974 Flaws, Including Two Exploited Windows Zero-Days

Microsoft addressed 974 vulnerabilities in its software suite during its recent Patch Tuesday, marking a record high. The breakdown includes 723 flaws in Windows, 111 in Office, 62 in SQL, and 22 in Developer Tools, with over 110 rated as critical. Two actively exploited vulnerabilities are CVE-2026-85880 and CVE-2026-81963, both allowing local privilege elevation. Other notable vulnerabilities include CVE-2026-55007 (8.1), CVE-2026-80097 (8.6), CVE-2026-69465 (8.8), and several with CVSS scores of 9.6 and above. Microsoft has patched a total of 2,760 security flaws this year, reflecting a trend of increasing vulnerability discoveries. Despite the extensive patching, no significant spike in active exploits has been observed.

Winsage

September 9, 2026

Microsoft’s Two-Track Patch Tuesday: Cloud Identity Flaws Fixed Before Disclosure, Windows Still Catching Up

The September 2026 security cycle revealed a bifurcated approach to vulnerability management by Microsoft, focusing on cloud-side identity services with silent mitigations and traditional Patch Tuesday updates for on-premises Windows infrastructure. On September 3, Microsoft addressed nine cloud-side vulnerabilities, including two with a CVSS score of 10.0: CVE-2026-83711 (Azure AD B2C elevation of privilege) and CVE-2026-70352 (Azure AI Language Authoring missing authentication). Additionally, CVE-2026-83941 (Entra ID elevation of privilege, rated 9.9) and CVE-2026-80098 (Copilot Studio cryptographic flaw) were noted. On September 8, the Patch Tuesday update addressed 70 CVEs, including critical issues in the on-premises stack, such as CVE-2026-83939 (Windows Secure Kernel Mode elevation of privilege). CVE-2026-69414 (ShieldBreak), an elevation of privilege vulnerability in the Defender Malware Protection Engine, was patched out-of-band on September 3 after being publicly exposed for three weeks. Microsoft is shifting its Self-Service Password Reset (SSPR) enforcement to default to passkeys as of September 7, with plans to phase out SMS and voice-based authentication by February 2027. This aims to enhance security by moving away from legacy credentials.

Winsage

September 9, 2026

Microsoft Patch Tuesday for September 2026 — Snort rules and prominent vulnerabilities

Microsoft's September 2026 security update revealed 973 vulnerabilities, with 113 classified as critical. Two actively exploited vulnerabilities are CVE-2026-81963 (Windows Update Stack, elevation of privilege, CVSS 7.8) and CVE-2026-85880 (Windows ALPC, elevation of privilege, CVSS 7.8). Among the 113 critical vulnerabilities, 82 are remote code execution (RCE) vulnerabilities. Notable vulnerabilities include: - CVE-2026-69676: RCE in Windows Kerberos, CVSS 8.8, authentication bypass. - CVE-2026-69852: RCE in Windows RRAS, CVSS 7.5, heap-based buffer overflow. - CVE-2026-72957: RCE in Windows Deployment Services, CVSS 7.8. - CVE-2026-69854: Elevation of privilege in Spring Cloud Azure, CVSS 9.0, improper authentication. - CVE-2026-83501: Information disclosure in Windows VBS, CVSS 5.5. - CVE-2026-69730: RCE in Windows DNS Server, CVSS 9.8. Less likely to be exploited vulnerabilities include: - CVE-2026-69845: RCE in Windows DHCP Server, CVSS 9.8, heap-based buffer overflow. - CVE-2026-65772: Vulnerability in Microsoft Dynamics 365 On-Premises, CVSS 8.8, deserialization of untrusted data. - CVE-2026-66302: RCE in Skype for Business, CVSS 9.8. Additional critical vulnerabilities include: - CVE-2026-62916: Elevation of privilege in Microsoft Entra ID, CVSS 9.1. - CVE-2026-83941: Elevation of privilege in Entra ID, CVSS 9.9. - CVE-2026-80098: Vulnerability in Copilot Studio, CVSS 9.3, improper verification of cryptographic signatures. Talos is releasing a new Snort ruleset to detect attempts to exploit these vulnerabilities, with specific SIDs for Snort 2 and Snort 3 rule coverage.

Winsage

September 8, 2026

Microsoft Releases September 2026 Patch Tuesday Updates

Microsoft released its September 2026 Patch Tuesday updates for Windows 11, focusing on versions 26H1 and 25H2/24H2. Key features include: - Taskbar customization for versions 25H2 and 24H2, allowing users to choose the taskbar's location and size. - Faster Windows Search with options to hide web and Microsoft Store suggestions. - Touch scrolling support in the "Recommended" section of File Explorer. - Start Menu customization options for size and visibility of sections. - Stability improvements for Microsoft Teams and Outlook on Arm64 PCs. For version 26H1, updates include: - Improved app search and Settings relevance in Windows Search. - Voice Isolation technology in Voice Access. - Updated taskbar notification badges and Weather widget display on the Lock Screen. - New gesture controls for Precision Touchpads. - Enhanced Sign-in Security supporting peripheral fingerprint sensors. - Optimized Windows Update progression calculations and clean-up logic. - Power settings allowing users to set energy saver activation thresholds. Microsoft is using AI to identify vulnerabilities, with 997 Common Vulnerabilities and Exposures reported, including one actively exploited vulnerability (CVE-2026-81963). Windows 11 version 26H2 has been made available to Insiders, with a public rollout expected next month.

Winsage

September 8, 2026

Microsoft releases Windows security update addressing 723 flaws

Microsoft released its September 2026 security updates, addressing two critical Windows elevation-of-privilege vulnerabilities: CVE-2026-85880 and CVE-2026-81963. Both vulnerabilities were exploited before their public disclosure on September 8. CVE-2026-85880 involves a heap-based buffer overflow in the Windows Advanced Local Procedure Call (ALPC), allowing low-privileged attackers to gain SYSTEM privileges. CVE-2026-81963 affects the Windows Update Stack due to improper link resolution and access controls, enabling similar privilege escalation. The September release also includes 974 Common Vulnerabilities and Exposures (CVEs) across various Microsoft products, with 723 affecting Windows. Users of Windows 11 24H2 and 25H2 receive updates via KB5124008, while Windows 11 26H1 receives KB5124012. Windows 11 24H2 Home or Pro editions will reach end of servicing on October 13, 2026. Users are advised to install the updates promptly and back up important data.

Winsage

September 6, 2026

Four REVSTEALER-Linked Modules Disable Windows Update and Defender to Run a Crypto Miner

Elastic Security Labs has identified four previously undocumented programs associated with REVSTEALER, a Windows information stealer that persists on infected machines after self-deletion. The programs are ProManager, WinUpdate, SoftManager, and LockAppHost, each with distinct functionalities. ProManager steals wallet files and logs passwords, WinUpdate monitors the clipboard for cryptocurrency addresses, SoftManager acts as a reverse proxy, and LockAppHost executes a cryptocurrency miner after disabling Windows Update and Microsoft Defender. REVSTEALER has been marketed as a commercial infostealer since February 2026, exfiltrating sensitive data such as browser passwords, cookies, and cryptocurrency wallet information. It deletes itself after reporting its activities but leaves the four programs installed for persistence. These programs share build tradecraft with REVSTEALER, including the use of identical packers and runtime function resolutions. REVSTEALER primarily spreads through game-cheat lures and disguises itself as pirated software. It employs evasion techniques to resist analysis, including checking for sandbox environments and using indirect system calls. Users are advised to avoid unofficial software and to follow specific steps if infected, such as re-enabling Windows Update services and changing passwords. Indicators of compromise include SHA-256 hashes for REVSTEALER and its associated programs, as well as domains linked to their command and control servers.

Tech Optimizer

September 4, 2026

12-Year-Old PostgreSQL Vulnerability Enables Database, Server Takeover

A significant vulnerability in PostgreSQL, tracked as CVE-2026-6471, has been identified by cybersecurity firm Cyera. This flaw, present since 2014, allows attackers with minimal privileges to potentially take control of databases and servers. The vulnerability, known as PostGREShell, has a CVSS score of 7.2 and can be exploited for remote code execution and privilege escalation due to a missing authorization in the database's logical decoding mechanism. Attackers with 'Replication' privileges can load arbitrary files through the logical decoding plugin, executing code with the privileges of the postgres system user. This can lead to the elevation of privileges to superuser status, granting unrestricted access to all tables and the ability to execute operating system commands. All PostgreSQL versions from 9.4 to 18 are affected, with a patch available in versions 18.6, 17.11, 16.15, 15.19, and 14.24. Organizations are advised to update their PostgreSQL instances and audit their Replication accounts.

Tech Optimizer

September 3, 2026

Avast Antivirus Zero-Day PoC Lets Attackers Dump SAM Database and Gain SYSTEM Shell

A public proof-of-concept (PoC) repository has revealed a local privilege escalation zero-day vulnerability in GenDigital's Avast Antivirus, allowing attackers with local execution access to extract the Windows Security Account Manager (SAM) database and execute a shell with NT AUTHORITYSYSTEM privileges. The flaw is located in the Avast Sandbox component and could enable a complete local takeover of the system. The PoC is compatible with any version of Avast Antivirus and has been tested on fully patched versions of Avast and Windows 11 25H2. The repository does not provide a formal release, CVE identifier, or patch details. The vulnerability may also affect other GenDigital products like AVG and Norton. Security teams are advised to monitor for suspicious activities related to Avast services and restrict local administrator access. Organizations should inventory their deployed versions and apply vendor-provided updates as they become available.

Tech Optimizer

September 3, 2026

Prolific Microsoft 0-day hunter drops CrowdStrike Falcon exploit PoC

Nightmare Eclipse, a security researcher known for identifying vulnerabilities in Microsoft products, has shifted focus to other vendors, revealing a zero-day vulnerability called FalconFlank that targets CrowdStrike’s Falcon endpoint security platform. FalconFlank is a privilege escalation vulnerability that exploits the Microsoft Office malicious macros remediation feature within CrowdStrike Falcon. CrowdStrike is investigating the claims and advises customers to disable the Microsoft Office File Suspicious Macro Removal Windows policy setting while assuring them of continued protection through Cloud Anti-malware settings. The exploit works on fully updated Windows 11 25H2 and Windows Server 2025 systems running CrowdStrike Falcon with Optimal Protection enabled. Nightmare Eclipse has also discovered other vulnerabilities, including HardBreacher affecting Kaspersky’s endpoint antivirus and PrettyPrague in Gen Digital’s Avast antivirus, which allows attackers to dump the SAM database. Gen Digital is developing a patch for the Avast vulnerability, while Kaspersky has not commented. Additionally, Nightmare disclosed a memory corruption zero-day vulnerability in Nvidia, named GreenSection, which causes system crashes.