Exploited Vulnerabilities Archives

Winsage

May 28, 2026

Your Windows PC has a security deadline in June 2026

A Secure Boot certificate refresh is being deployed across supported Windows devices via Windows Update. The Secure Boot certificates from 2011 will begin to expire in June 2026, prompting Microsoft to introduce new 2023-dated certificates to maintain security. Most users will require minimal action if their PCs are updated, but older devices may face challenges. The current certificates include: - Microsoft Corporation KEK CA 2011: expires June 24, 2026 - Microsoft UEFI CA 2011: expires June 27, 2026 - Microsoft Windows Production PCA 2011: expires October 19, 2026 The new certificates will remain valid until 2038, with plans for post-quantum cryptography around 2030. While PCs using the 2011 certificates will continue to function, they will lose access to new security protections, making them vulnerable to emerging threats. A notable example of such a threat is the BlackLotus bootkit, which exploited vulnerabilities to bypass Secure Boot. Microsoft's rollout strategy involves a staged update process that typically takes around 48 hours and may require restarts. Users are advised to keep Windows updated and check their Secure Boot status. Known issues may arise for older PCs, systems that bypassed Windows 11 requirements, Legacy BIOS systems, and custom firmware configurations. IT teams managing devices should inventory their systems, monitor specific event IDs, test updates, and document devices that cannot be updated.

Tech Optimizer

May 22, 2026

Microsoft confirms two major Defender security issues — so update now or face possible attack

Microsoft has addressed two critical zero-day vulnerabilities in its Defender antivirus software: CVE-2026-41091 (privilege escalation) and CVE-2026-45498 (denial of service). The patches were delivered through Malware Protection Engine version 1.1.26040.8 and Antimalware Platform version 4.18.26040.7. Users are advised to verify their software versions to ensure they have the latest updates. Both vulnerabilities have been included in the Cybersecurity and Infrastructure Security Agency's Known Exploited Vulnerabilities catalog, requiring federal agencies to patch them or stop using the affected software by June 3.

Winsage

April 17, 2026

Hackers are abusing unpatched Windows security flaws to hack into organizations

Hackers have exploited vulnerabilities in Windows systems, specifically targeting three flaws: BlueHammer, UnDefend, and RedSun. BlueHammer has been patched by Microsoft, while UnDefend and RedSun remain unaddressed. The exploitation is linked to code published by a researcher named Chaotic Eclipse, who criticized Microsoft for their response to vulnerabilities. All three flaws affect Windows Defender, allowing hackers potential high-level access to systems. Microsoft emphasized the importance of coordinated vulnerability disclosure to protect customers and the research community. The situation underscores the ongoing struggle between cybersecurity defenders and cybercriminals.

AppWizard

April 17, 2026

European civil servants are being forced off WhatsApp

Apps like Signal and WhatsApp are recognized for their end-to-end encryption but are increasingly seen as inadequate for organizational communication due to their consumer-grade design. Benjamin Schilz, CEO of Wire, points out the risks of using such apps for professional purposes. Recent cybersecurity threats, including a Russian espionage campaign targeting these applications, highlight the importance of advanced features like access controls and metadata management, especially for large organizations. Belgium's De Waele advocates for controlled communication environments that include only government employees to mitigate risks. Transparency advocates have raised concerns about the privacy features of consumer apps obscuring important decision-making processes, as exemplified by a situation involving Commission President Ursula von der Leyen and a vaccine deal. The re-election of former U.S. President Donald Trump has prompted a shift in priorities towards secure communication channels within European governments.

Winsage

April 16, 2026

CISA flags Windows Task Host vulnerability as exploited in attacks

The Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning about a vulnerability in the Windows Task Host, identified as CVE-2025-60710, which poses a risk of privilege escalation, potentially allowing attackers to gain SYSTEM privileges. This flaw affects devices running Windows 11 and Windows Server 2025 and arises from a weakness in link following. Microsoft released a patch for this issue in November 2025. CISA has added CVE-2025-60710 to its list of actively exploited vulnerabilities and mandated that Federal Civilian Executive Branch agencies secure their systems within two weeks. CISA encourages all organizations, including those in the private sector, to implement necessary patches and improve network security. CISA also advised organizations to follow vendor instructions for mitigations or discontinue use of the affected product if mitigations are unavailable.

Tech Optimizer

March 7, 2026

CVE-2026-3172 Impact, Exploitability, and Mitigation Steps

On February 25, 2026, a high-severity vulnerability affecting PostgreSQL and its extension, pgVector, was disclosed, with a CNA score of 8.1. The affected technologies are PostgreSQL and pgVector. There are currently no public or known exploits listed in the CISA Known Exploited Vulnerabilities (KEV) database, and the exploitation probability percentile is 14.5%. The vulnerability impacts specific packages and libraries, including pgvector and postgresql18-pgvector. Organizations are advised to monitor for updates and apply necessary patches.

Winsage

February 17, 2026

Microsoft Windows 11 KB5077181 Update Triggers Infinite Restart Loop on Some Devices

Microsoft's Patch Tuesday update, KB5077181, released on February 10, 2026, has caused significant boot failures for users of Windows 11 versions 24H2 (OS build 26200.7840) and 25H2 (OS build 26100.7840), resulting in endless restart loops. Users are reporting over 15 reboot cycles, preventing access to their desktops. Issues include System Event Notification Service (SENS) errors and DHCP problems affecting internet connectivity. Installation errors with codes 0x800f0983 and 0x800f0991 indicate potential hardware, driver, or servicing stack incompatibilities. The update was intended to address 58 vulnerabilities, including six zero-days, but the boot loop issue has overshadowed these enhancements. CVE IDs and their CVSS scores related to the vulnerabilities addressed include: - CVE-2026-21510: 7.5 - CVE-2026-21519: 7.8 - CVE-2026-21533: 8.8 - CVE-2026-20841: 7.1 As of February 15, 2026, there is no "known issues" entry in Microsoft's release notes despite user reports. Users can uninstall the update through the Control Panel if their systems are accessible, or use the Windows Recovery Environment to execute commands for uninstallation if their systems are unbootable.

Winsage

February 16, 2026

Windows 11 KB5077181 Security Update Causing Some Devices to Restart in an Infinite Loop

Microsoft's security update KB5077181, released on February 10, 2026, for Windows 11 versions 24H2 and 25H2, has caused critical boot failures, leading to infinite restart loops for users. The update addresses 58 vulnerabilities, including six zero-day exploits, and introduces new Secure Boot certificates. Users have reported errors such as “a specified procedure could not be found” and DHCP failures, with installation errors like 0x800f0983 and 0x800f0991 affecting specific hardware. To resolve issues, users are advised to uninstall the update and pause Windows Update. Accessing the Windows Recovery Environment may also be necessary for persistent boot loops. While some users experienced improvements, the overall instability highlights risks associated with updates. Microsoft has not acknowledged any known issues related to this update as of February 15.

Winsage

January 15, 2026

Windows info-disclosure 0-day bug gets a fix as CISA sounds alarm

Microsoft and the U.S. government have issued a warning about a vulnerability in Windows, designated CVE-2026-20805, which is currently being exploited. This flaw allows an authorized attacker to leak a memory address from a remote ALPC port, potentially leading to arbitrary code execution. It has a medium severity rating of 5.5 on the CVSS scale. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added this vulnerability to its Known Exploited Vulnerabilities catalog and requires federal agencies to implement a patch by February 3. Additionally, two other vulnerabilities were acknowledged: CVE-2026-21265, a secure boot certificate expiration bypass with a CVSS rating of 6.4, and CVE-2023-31096, an elevation of privilege flaw affecting third-party Agere Modem drivers, rated at 7.8. Two more vulnerabilities, CVE-2026-20952 (CVSS 7.7) and CVE-2026-20953 (CVSS 7.4), are use-after-free flaws in Office that could allow unauthorized code execution.

Winsage

January 14, 2026

U.S. CISA adds a flaw in Microsoft Windows to its Known Exploited Vulnerabilities catalog

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a Microsoft Windows vulnerability, CVE-2026-20805, to its Known Exploited Vulnerabilities (KEV) catalog, with a CVSS score of 8.7. This vulnerability, part of the January 2026 Patch Tuesday updates, affects the Windows Desktop Window Manager and allows attackers to leak memory information, potentially aiding in further exploits. Federal Civilian Executive Branch agencies must address this vulnerability by February 3, 2026, as mandated by Binding Operational Directive 22-01.