Q1 2026 Threat Landscape: Exploit Kits, Vulnerabilities, and C2 Framework Trends

In the first quarter of 2026, cybercriminal toolkits expanded significantly, incorporating fresh exploits targeting Microsoft Office, Windows, and Linux systems. This analysis delves into the vulnerability registration statistics from CVE.org, the exploitation patterns observed in the wild, and the persistent threats from legacy vulnerabilities. Below, we answer key questions about the evolving threat landscape during Q1 2026.

What new exploits were incorporated into threat actor toolkits in Q1 2026?

During Q1 2026, exploit kits maintained by threat actors were updated with several novel exploits. Notably, new vulnerabilities affecting the Microsoft Office platform were added, including remote code execution (RCE) flaws. Additionally, exploits targeting Windows OS components and Linux systems emerged. Among the most prominent newcomers were vulnerabilities that allowed attackers to bypass security mechanisms and execute arbitrary commands. For instance, CVE-2025-6218 enabled relative path specification to extract files into arbitrary directories, while CVE-2025-8088 exploited directory traversal via NTFS Streams during file extraction. These additions reflect the continuous arms race between defenders and attackers, with exploit kits evolving to leverage the latest unpatched flaws.

How did the overall number of registered vulnerabilities change in Q1 2026?

According to data from cve.org, the total volume of vulnerabilities published monthly has been on a steady rise since January 2022. In Q1 2026, this upward trajectory continued. The increasing use of AI agents for discovering security issues is expected to accelerate this trend even further. While the exact monthly counts are available for download, the overall pattern indicates that the number of CVEs is growing, driven by more systematic scanning and automated fuzzing techniques. This growth presents a challenge for organizations, as they must prioritize patch management across a larger pool of potential weaknesses.

What was the trend for critical vulnerabilities (CVSS > 8.9) in Q1 2026?

Despite the overall increase in vulnerability registrations, the number of critical vulnerabilities (scoring 9.0 or higher on the CVSS scale) saw a slight decrease compared to previous years. However, a clear upward trend remained visible. This apparent contradiction is attributed to the disclosure of several severe vulnerabilities in web frameworks at the end of the previous year, which inflated the baseline. Current growth in critical issues is fueled by high-profile problems like React2Shell, the release of exploit frameworks for mobile platforms, and the discovery of secondary vulnerabilities uncovered while remediating earlier flaws. Analysts hypothesize that if this pattern holds, Q2 2026 may experience a significant decline, similar to the seasonal dip observed in the prior year.

Which veteran vulnerabilities continued to dominate exploitation statistics?

Even as new exploits emerge, a handful of older vulnerabilities consistently account for the largest share of detections in Q1 2026. These veteran flaws remain attractive to attackers because of their widespread impact and the persistence of unpatched systems. Key examples include:

• CVE-2018-0802 – a remote code execution vulnerability in Microsoft Office's Equation Editor.
• CVE-2017-11882 – another Equation Editor RCE flaw, still widely exploited.
• CVE-2017-0199 – affecting Microsoft Office and WordPad, allowing system control.
• CVE-2023-38831 – improper handling of objects within archives.

These vulnerabilities highlight how legacy software components and delayed patching cycles provide fertile ground for attackers.

What new exploits targeting Microsoft Office and Windows were observed?

In addition to the veteran exploits, Q1 2026 saw the emergence of new exploits specifically targeting the Microsoft Office platform and Windows OS components. These exploits take advantage of recently registered vulnerabilities that were not yet widely patched. For example, some exploits leveraged flaws in Office's parsing engines or in how Windows handles file extraction processes. The inclusion of these new exploits in common exploit kits indicates that threat actors are quick to weaponize newly published CVEs. Organizations that delay patching for Office and Windows updates become prime targets for these attacks.

What is the hypothesis regarding critical vulnerability trends for Q2 2026?

Based on the patterns observed in Q1 2026, analysts propose that the number of critical vulnerabilities may decline significantly in Q2 2026. This hypothesis stems from the fact that the end of 2025 saw a surge in severe web framework disclosures, which artificially boosted the critical count. The current Q1 growth is partly driven by the fallout of those disclosures, including the React2Shell vulnerability and related mobile exploit frameworks. If the pattern repeats from the previous year, where a spike was followed by a decline, Q2 should show a drop. However, this is contingent on no major new disclosure campaigns. The hypothesis will be tested with next quarter's data.

How are AI agents influencing vulnerability discovery?

According to current reports, the use of AI agents for discovering security issues is expected to reinforce the upward trend in vulnerability registrations. AI-driven fuzzing and code analysis can identify flaws more efficiently than traditional manual methods, leading to a higher volume of CVEs being published. While this helps improve overall security by surfacing bugs before attackers exploit them, it also increases the workload for defenders who must triage and patch these newly discovered vulnerabilities. The impact is likely to be most pronounced in large codebases and complex software ecosystems where manual auditing is impractical.