Exploited CVEs / CVE-2026-55255
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CVE-2026-55255
Actively exploited Langflow Langflow vulnerability, Critical severity, CVSS 9.9. Added to the CISA KEV catalog 2026-07-07.
Langflow Authorization Bypass Through User-Controlled Key Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2026-07-10 (that deadline has passed); treat that date as the outer bound for your own environment. Check the vendor security advisory for the fix.
Risk summary
Senserva AI Opinion and rich prompt for CVE-2026-55255
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-55255
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2026-07-10 (past due).
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 and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Official fix for CVE-2026-55255
Check the vendor's security advisory channel for the patched Langflow versions and workarounds.
Common questions about CVE-2026-55255
Is CVE-2026-55255 actively exploited?
Yes. CVE-2026-55255 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-07-07, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is <1%.
What is the CISA deadline and required action for CVE-2026-55255?
CISA set the federal (BOD 22-01) remediation due date at 2026-07-10, which has passed; treat any unremediated system as overdue. The verbatim required action: 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 and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
What fixes CVE-2026-55255?
Check the vendor's security advisory for the patched Langflow versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2026-55255?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-55255's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed three times a day (5 AM, 12:30 PM, and 7 PM US Central).
More exploited Langflow CVEs
The newest Langflow entries on the CISA KEV catalog:
Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
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