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Critical CVE Live Watch for August 5, 2026: Exploited and High-Risk Vulnerabilities

05/08/2026Yash Patel9 min read
Critical CVE Live Watch for August 5, 2026: Exploited and High-Risk Vulnerabilities

A live vulnerability watch focused on exploited flaws, critical and high-severity records, remediation deadlines, and practical patch priority.

Exploit-led priority

The fastest way to reduce vulnerability risk is to combine exploitation evidence with your own exposure. This briefing separates CISA KEV entries from newly published high-severity records so patch teams can see which signals carry the strongest urgency.

For August 5, 2026, the lead development is CVE-2026-55255: Langflow cross-user flow authorization bypass. Start by confirming where Langflow Langflow before 1.9.1 is deployed, who owns it, and whether the affected path is reachable. The remaining items below add the product-specific context needed to turn the headline into an owned security decision.

Vulnerabilities requiring action

CVE-2026-55255: Langflow cross-user flow authorization bypass

NIST NVD and CISA KEV | July 7, 2026 | Known Exploited | CVSS 8.4 | Langflow Langflow before 1.9.1

Before version 1.9.1, an authenticated attacker could specify another user's flow ID and execute that flow. The CNA rates the issue 8.4 High, and CISA lists active exploitation.

Why it matters: Langflow Langflow before 1.9.1 can combine untrusted text with connectors, stored credentials, and tool permissions. The meaningful risk is what the surrounding agent is allowed to read, change, or send.

What to verify: Test with hostile input in an isolated environment, inspect connector scopes and retained context, require approval for sensitive actions, and confirm that tool calls are logged and attributable.

CISA remediation date: 2026-07-10. Apply the current Langflow fix and follow CISA KEV remediation guidance.

Operational focus: Check internet-facing and administrative instances first, then confirm the fixed version from the vendor.

Open the original NIST NVD and CISA KEV record

CVE-2026-18556: N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability

CISA Known Exploited Vulnerabilities | August 4, 2026 | Known Exploited | N-able N-central

N-able N-central contains an authentication bypass using an alternate path or channel that allows for authentication bypass.

Why it matters: N-able N-central concerns a trust decision rather than a cosmetic defect. If the affected path is reachable, an attacker may cross a role, tenant, or login boundary.

What to verify: Reproduce the expected access checks safely, identify exposed roles and tenants, invalidate risky sessions or tokens, patch the decision point, and retest denied cases.

CISA remediation date: 2026-08-07. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance…

Operational focus: Map the affected product to asset owners and set a validation deadline before closing remediation.

Open the original CISA Known Exploited Vulnerabilities record

CVE-2026-34486: Apache Tomcat Missing Encryption of Sensitive Data Vulnerability

CISA Known Exploited Vulnerabilities | August 4, 2026 | Known Exploited | Apache Tomcat

Apache Tomcat contains a missing encryption of sensitive data vulnerability that allows the bypass of the EncryptInterceptor.

Why it matters: Apache Tomcat belongs in an exploit-led queue only after the affected product is matched to a reachable asset and accountable owner.

What to verify: Separate confirmed applicability from broad advisory language, assign the remediation decision, and keep any exception visible with an expiry date.

CISA remediation date: 2026-08-07. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance…

Operational focus: Look for exploitation indicators while patching, especially where the service was publicly reachable.

Open the original CISA Known Exploited Vulnerabilities record

CVE-2026-9198: IBM Langflow Code Injection Vulnerability

CISA Known Exploited Vulnerabilities | August 4, 2026 | Known Exploited | IBM Langflow

Langflow contains a code injection vulnerability that allows unauthenticated attackers to achieve full remote code execution on default Langflow deployments.

Why it matters: IBM Langflow can combine untrusted text with connectors, stored credentials, and tool permissions. The meaningful risk is what the surrounding agent is allowed to read, change, or send.

What to verify: Test with hostile input in an isolated environment, inspect connector scopes and retained context, require approval for sensitive actions, and confirm that tool calls are logged and attributable.

CISA remediation date: 2026-08-07. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance…

Operational focus: Check internet-facing and administrative instances first, then confirm the fixed version from the vendor.

Open the original CISA Known Exploited Vulnerabilities record

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