This Week's Top Five Stories in Cyber China Closes in on Cyber Race as GLM-5.3 Beats US Models Leading Chinese start-up Z.ai has launched GLM-5.3, an open-source model that demonstrates improved coding and cybersecurity performance compared to GLM-5.2. Benchmark data released by Z.ai reveals that the model achieved high scores on a cyber performance test, surpassing several models from US companies Anthropic and OpenAI. The release comes at a time when the US State Department has reportedly been drafting a correspondence to multiple countries regarding the AI competition with China. Reuters reviewed an internal draft, which states that dozens of countries must choose between a US-led AI coalition and Beijing's competing framework, with exclusion from the former if they join the latter. How RingCentral Breach Exposed 1.6 Million Customer Records Cybercriminal group ShinyHunters has released into the open 1.6 million records of customer accounts from cloud-based business communications platform – RingCentral. Data from the company was compromised following what it called “a sophisticated social engineering campaign” back in July. RingCentral disclosed on July 28 2026 that it had been targeted in an incident which “has affected data for a limited portion of RingCentral customers”. “Upon detection, we promptly took steps to stop the unauthorised activity and immediately began an investigation with assistance from a leading third-party forensic firm,” RingCentral highlighted. PLM Zero Day Flaw Exploited by Clop in Massive Data Breach Infamous for exploiting vulnerabilities in software used by a large number of enterprises claiming multiple high-profile victims in a single attempt, the Clop cybercriminal group has struck again. Coming out with claims of a massive data breach affecting nearly 50 companies, the prolific Russian-speaking threat actor adds giants like Shell, Philips, GE and Fiserv among the multinationals affected. Clop alleges to have stolen 89GB data from Shell, 15.5GB from