A surge of significant cybersecurity incidents and threat trends marked the end of 2025, with attackers exploiting both newly disclosed and longstanding vulnerabilities across diverse platforms. Notably, a critical vulnerability in MongoDB, tracked as CVE-2025-14847 and dubbed "MongoBleed," was actively exploited, putting over 87,000 instances at risk of data leakage. The year also saw the emergence of advanced Android malware like Frogblight, which targeted users through fraudulent apps to steal banking credentials and personal data, and a continued expansion of malware campaigns beyond Windows, affecting Android and macOS users with sophisticated banking Trojans and infostealers. Meanwhile, the fallout from the 2022 LastPass breach persisted, as attackers continued to crack stolen encrypted vaults and siphon cryptocurrency through 2025, leveraging Russian cybercrime infrastructure for laundering stolen funds.
The threat landscape was further shaped by large-scale DDoS campaigns, such as those orchestrated by the pro-Russian group NoName057(16), which targeted hundreds of domains across Europe, and by the exploitation of vulnerabilities in widely used devices like WatchGuard Firebox firewalls (CVE-2025-14733). High-profile breaches, including those involving Salesforce integrations and third-party contractors, exposed sensitive data from major organizations. The year also witnessed a record number of Microsoft vulnerabilities, with attackers rapidly exploiting zero-days and privilege escalation flaws, underscoring the shrinking window between disclosure and exploitation. These developments highlight the increasing sophistication, scale, and persistence of cyber threats facing organizations worldwide as 2025 concluded.

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21 events from the most recent confirmed update back to the earliest known activity.
Researchers identified a new Android malware strain called Frogblight that spreads through fraudulent apps impersonating legitimate services. Once installed, it steals banking credentials, personal information, and SMS data while maintaining persistent access.
The U.K. Information Commissioner's Office fined LastPass £1.2 million ($1.6 million) for inadequate security measures that failed to prevent the breach. The penalty was reported in late 2025 as fallout from the 2022 incident.
By late 2025, TRM Labs had traced more than $28 million in cryptocurrency theft enabled by cracked LastPass vault backups and linked laundering activity to Russian cybercrime infrastructure. The analysis showed the 2022 breach was still causing financial harm in 2025.
A Russian scientist received a sentence in a cyber-related treason case during the final weeks of 2025. The case was cited alongside other notable law-enforcement and judicial actions.
Authorities arrested a former Coinbase agent in India in a cyber-related insider crime case. The arrest was reported among notable law-enforcement developments in the final weeks of 2025.
APT group Evasive Panda was reported using DNS poisoning to deliver MgBot malware in late 2025. The campaign demonstrated continued use of network-level manipulation to deploy malware.
A compromised Trust Wallet Chrome extension was used to steal $7 million. The incident was highlighted in late-2025 reporting on wallet breaches and financially motivated attacks.
During the final weeks of 2025, attackers actively exploited MongoDB vulnerability CVE-2025-14847, also called MongoBleed. The activity was cited as part of a broader surge in rapid exploitation of both new and old flaws.
Between December 22 and 28, 2025, SOCRadar observed 6,567 DDoS attack entries attributed to NoName057(16) and its DDoSia project. The campaign targeted 158 domains and 161 IPs, with Finland and France among the main targets.
Researchers highlighted malware such as Webrat being used against infosec enthusiasts through fake proof-of-concept exploits. The campaign showed how threat actors were weaponizing researcher interest in new vulnerabilities.
Researchers reported the emergence of DIG AI, an uncensored darknet AI assistant used by criminals and terrorists. The finding underscored the growing role of illicit AI tooling in cybercrime ecosystems.
Law enforcement agencies across 19 African countries arrested 574 suspects and recovered $3 million in a major cybercrime operation. The crackdown was reported as one of the significant developments of the week before December 28, 2025.
Attackers began actively exploiting remote code execution vulnerability CVE-2025-14733 in more than 115,000 WatchGuard Firebox firewalls. The activity marked a major late-2025 firewall exploitation wave.
React2Shell (CVE-2025-55182), described as a CVSS 10 issue in React Server Components caused by unsafe deserialization, was publicly disclosed in 2025. Public proof-of-concept code and exploitation appeared within hours, with broad internet exposure reported.
The University of Pennsylvania, Harvard, and Princeton were among universities breached through phishing attacks in 2025. The incidents exposed personal and financial information belonging to students, alumni, donors, and staff.
The Clop ransomware group exploited a vulnerability in Oracle's E-Business platform to steal sensitive data from hospitals, media companies, universities, and other organizations. The stolen data was then used for extortion.
Attackers compromised Salesforce customer data by breaching third-party contractor integrations, affecting organizations including Cloudflare, Docusign, and Verizon. Reporting attributed the activity to the Scattered Lapsus$ Hunters group and highlighted third-party risk in SaaS ecosystems.
A breach involving Salesloft's GitHub environment enabled attackers to steal OAuth tokens tied to a Salesforce integration. This access later supported attacks against hundreds of Salesforce instances and multiple major companies.
Attackers renewed exploitation of Fortinet's older vulnerability CVE-2020-12812 during the final weeks of 2025, showing continued abuse of legacy flaws that remain unpatched in some environments.
In September 2025, researchers highlighted Shai-Hulud, a self-propagating infostealer worm that poisoned open-source packages by abusing maintainers' automation. GitHub said it would take action to limit similar incidents.
In 2022, LastPass was breached and encrypted vault backups were stolen. Those backups later became the basis for long-term password cracking and cryptocurrency theft against users with weak master passwords.
Vulnerabilities, threat actors, malware, products, organizations, and breaches Mallory has linked to this story.
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