Top Cybersecurity Stories: SharePoint Exploits Warned by US Authorities, Citrix and WordPress Flaws Lead Weekly Rankings
Security NEXT has released its list of the ten most-read articles for the week of September 27 to October 3, 2026, reflecting strong reader interest in active vulnerability exploitation and confirmed security incidents.
Leading the ranking is a report on US authorities warning about the exploitation of five vulnerabilities in SharePoint and WordPress. Second place went to advisories covering multiple flaws in Citrix NetScaler, including two vulnerabilities already confirmed as exploited, prompting organizations to conduct compromise investigations.
Third on the list is Apple's release of iOS 26.7.1, which patches vulnerabilities that may have been used in targeted attacks against specific individuals. Fourth place covered a data breach at car-sharing service Times Car that exposed member personal information.
Further down the ranking, WordPress received another critical vulnerability disclosure requiring an update within just five days. A ransomware incident affecting some group company sales systems at Keio Electric Railway also drew significant attention.
Additional stories included a Chrome security update fixing 32 vulnerabilities, a suspected unauthorized access incident at Japan Post servers still under investigation, a zero-day flaw in Catalyst SD-WAN Manager requiring immediate updates and compromise checks, and multiple vulnerabilities addressed in PHP through newly released security updates.
Related articles
Apple iOS Security Architecture: From Power Button to App Launch in Modern Devices
The article examines the complete boot and trust chain in modern iPhones, starting from the immutable BootROM and progressing through iBoot, the XNU kernel, and the Secure Enclave. It explains how Secure Boot verifies signatures but does not guarantee absence of vulnerabilities, allowing exploits like checkm8 to persist across devices. The piece details data protection classes, BFU versus AFU states, and how passcodes interact with hardware-bound keys to limit brute-force attempts. It further describes application sandboxing, entitlements, code signing, and Pointer Authentication (PAC) as layered defenses that raise the cost of exploitation. The analysis shows why modern jailbreaks require multi-stage chains involving kernel read/write, sandbox escapes, and PAC bypasses rather than single vulnerabilities. Overall, the architecture transforms privilege from a simple scalar into a graph of capabilities across isolated components.
Critical PHP Vulnerabilities CVE-2026-109618 and CVE-2026-109619 Enable Unauthenticated Remote Code Execution
Two critical vulnerabilities in PHP, tracked as CVE-2026-109618 and CVE-2026-109619, both scoring CVSS 9.2, were disclosed on October 21. The flaws allow attackers to execute arbitrary code without authentication by triggering out-of-memory conditions that lead to use-after-free memory corruption. Exploitation involves specially crafted requests that manipulate uninitialized arrays and function pointers, with full chains demonstrated via PHP_SESSION_UPLOAD_PROGRESS and fatal error backtraces. The issues affect PHP versions starting from 5.4 and were discovered using AI tools Gemini 4 Argon and GPT-5.6 Sol, resulting in a patch exceeding 10,000 lines of code. Amazon detected attacks as early as October 17, with Cloudflare later reporting millions of exploitation attempts. Mitigation requires updating to patched versions such as PHP 8.2.35, 8.3.36, 8.4.27 or 8.5.12, while temporary workarounds include disabling session upload progress and fatal error backtraces.
Trend Micro ZDI Reports on Critical Linux KSMBD Vulnerabilities Leak to Public Mailing Lists Before Patches
Trend Micro Zero Day Initiative inadvertently published detailed vulnerability reports for the Linux kernel's KSMBD component into public mailing lists. Two flaws received CVSS scores of 9.0, enabling remote code execution under specific conditions. One issue involves a race condition during parallel SMB request handling, while the second stems from an incorrect buffer size calculation in the SMB Direct mechanism that requires RDMA and a writable share. Technical details including root causes and reproduction steps became publicly archived before fixes reached end users. The KSMBD maintainer has already merged a patch for ZDI-CAN-33774 into their repository, yet distribution kernels may still lack the update. Additional privilege-escalation and information-disclosure risks in other kernel components were also described in the leaked messages.
Node.js Issues Security Releases for 26.x, 24.x and 22.x Fixing High-Severity TLS and Brotli Flaws
Node.js published security updates on October 21, 2026 for the 26.x, 24.x and 22.x release lines. The patches address multiple high-severity vulnerabilities affecting TLS hostname validation and the Brotli decoder, along with updates to critical dependencies including OpenSSL and Undici. Several CVEs cover bypasses in certificate hostname checks when IP addresses use full-width digits or when hosts resolve loosely to IP addresses. A particularly serious out-of-bounds write in the Brotli decoder (CVE-2026-111497) could enable remote code execution on services processing compressed responses. Additional fixes resolve keep-alive socket timing issues, DNS resolution truncation with NUL characters, and entropy caching problems in crypto.randomUUID and randomInt functions. The releases also update c-ares, Undici, OpenSSL, SQLite and ca-cert bundles following the eMudhra intermediate CA compromise.