CISA added eight actively-exploited vulnerabilities to its Known Exploited Vulnerabilities catalog on April 20, with federal agencies required to patch three Cisco Catalyst SD-WAN Manager flaws by today, April 23, and the remaining five by May 4. The Cisco trio (CVE-2026-20122, CVE-2026-20128, CVE-2026-20133) enable arbitrary file upload with vmanage user privileges, recovery of stored credentials for the DCA user, and unauthenticated disclosure of sensitive configuration data. Cisco confirmed exploitation of the first two in March 2026. The other five cover a wide blast radius: CVE-2025-32975 is a CVSS 10.0 authentication bypass in Quest KACE Systems Management Appliance letting attackers impersonate any user without credentials, exploited in the wild by unknown actors last month per Arctic Wolf. CVE-2023-27351 is the PaperCut NG/MF bypass that Microsoft's Lace Tempest chained into Cl0p and LockBit deployments back in 2023. CVE-2024-27199 is a path traversal in JetBrains TeamCity giving limited admin actions - its sibling CVE-2024-27198 is already on the KEV list. CVE-2025-48700 is a Zimbra XSS that the Ukrainian CERT attributes to UAC-0233/UAC-0250 for stealing mailbox contents, MFA backup codes, and application passwords. CVE-2025-2749 is a Kentico Xperience Staging Sync Server path traversal.
A critical code injection flaw in Apache ActiveMQ Classic has been under active exploitation in the wild, and CISA added it to the Known Exploited Vulnerabilities catalog on April 16 with a federal patch deadline of April 30. The flaw, tracked as CVE-2026-34197 (CVSS 8.8), has been 'hiding in plain sight' for 13 years according to Horizon3.ai researcher Naveen Sunkavally. The vulnerability is in the Jolokia JMX-HTTP bridge exposed at /api/jolokia/. An attacker can send crafted HTTP requests with a malicious discovery URI that forces the broker to load a remote Spring XML configuration. Because Spring initializes beans before validation, attackers execute arbitrary OS commands via Runtime.exec() - effectively turning a messaging broker into a remote command runner. Fortinet FortiGuard Labs telemetry shows exploitation attempts peaking on April 14, 2026. SAFE Security reports threat actors actively scanning for exposed Jolokia management endpoints.
NIST has announced major changes to how the National Vulnerability Database processes new CVEs, driven by a 263% surge in submissions that the agency can no longer keep up with. As of April 15, 2026, NIST will only provide full enrichment (CVSS scoring, CWE mapping, CPE identification) for CVEs that meet specific criteria: vulnerabilities in the CISA KEV catalog, those in software used by the federal government, and a small set of other priority categories. Everything else remains listed in the NVD but without the detailed metadata that security teams rely on for automated patch prioritization. Dustin Childs at ZDI noted during Patch Tuesday coverage that AI-driven vulnerability discovery has tripled his own triage volume. The same pressure is hitting NIST. Practical impact: vulnerability management tools, automated scanners, and patch prioritization workflows that depend on NVD enrichment data will have blind spots for the majority of new CVEs. Private vulnerability intelligence feeds (VulnCheck, Tenable, Qualys) become more important for anyone who relied on NVD as the single source of truth.
Google pushed an emergency Chrome update to fix a use-after-free bug in Dawn, the engine behind Chrome's WebGPU graphics standard. CVE-2026-5281 is already being exploited - an attacker who has compromised the browser's renderer process can use a crafted HTML page to execute arbitrary code, potentially escaping Chrome's sandbox. This is the fourth actively exploited Chrome zero-day in 2026, and the third targeting graphics or rendering subsystems. CISA added it to the KEV catalog with an April 15 deadline.
The Citrix NetScaler flaw we reported under active recon two days ago has escalated fast. Attackers are now sending crafted SAMLRequest payloads that trigger memory leaks exposing sensitive data through session cookies. CISA added CVE-2026-3055 to the Known Exploited Vulnerabilities catalog on March 30 with an unusually tight April 2 remediation deadline - just three days for federal agencies.
Remember that F5 BIG-IP APM bug from last year everyone treated as a denial-of-service issue? Turns out it's pre-auth remote code execution - CVSS 9.3. F5 quietly reclassified it after new findings in March 2026 and confirmed exploitation in the wild. CISA added it to the KEV catalog with a March 30 patch deadline. That's tomorrow.
Attackers didn't wait for a proof-of-concept. Within 20 hours of CVE-2026-33017 being disclosed in Langflow - an open-source AI workflow builder with 145K+ GitHub stars - they built working exploits straight from the advisory. One crafted HTTP POST to the public flow endpoint is all it takes, no credentials needed. Compromised instances leak API keys for OpenAI, AWS, and connected databases.
TrustStrike Labs