CISA ADDS THREE ACTIVELY EXPLOITED VULNERABILITIES TO KNOWN EXPLOITED VULNERABILITIES CATALOG

Threat Summary

Category: Active Exploitation / Multiple Vulnerabilities / Enterprise Security
Affected Products: JoomShaper SP Page Builder, Langflow, Joomlack Page Builder
CVEs: CVE-2026-48908, CVE-2026-55255, CVE-2026-56290
Primary Risks: Remote Code Execution, Authorization Bypass, Arbitrary File Upload, Improper Access Control, Unauthorized System Access, Enterprise Network Compromise
Threat Status: Confirmed Active Exploitation
Affected Environment: Federal Agencies, Enterprise Networks, Organizations Operating Affected Applications and Web Platforms
Attack Vectors: Unrestricted File Upload, Authorization Bypass, Improper Access Control
CISA Action: Added to Known Exploited Vulnerabilities (KEV) Catalog

The Cybersecurity and Infrastructure Security Agency (CISA) has added three newly exploited vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, confirming that threat actors are actively targeting each flaw in operational environments.

The additions include vulnerabilities affecting JoomShaper SP Page Builder, Langflow, and Joomlack Page Builder, each presenting attackers with opportunities to compromise vulnerable systems through different attack techniques.

The inclusion of these vulnerabilities in the KEV Catalog elevates them to high-priority security issues requiring immediate attention from organizations operating affected software. Once a vulnerability reaches the KEV Catalog, CISA has confirmed evidence that exploitation is occurring outside laboratory testing or proof-of-concept demonstrations and is being observed in real-world attacks.

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Vulnerability Details

CVE-2026-48908 — JoomShaper SP Page Builder

According to CISA, CVE-2026-48908 is an Unrestricted Upload of File with Dangerous Type vulnerability affecting JoomShaper SP Page Builder.

This type of vulnerability may allow attackers to upload malicious files to vulnerable servers. If successfully exploited, attackers could execute arbitrary code, install web shells, deploy malware, establish persistent access, or gain control over affected web applications depending upon server configuration and security controls.

Because unrestricted file upload vulnerabilities frequently provide an initial point of compromise, they remain among the most commonly exploited weaknesses targeting internet-facing web applications.

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CVE-2026-55255 — Langflow

CVE-2026-55255 affects Langflow and involves an Authorization Bypass Through User-Controlled Key vulnerability.

Authorization bypass flaws allow attackers to circumvent intended security controls and obtain access to functions or information that should normally require authentication or elevated privileges.

If successfully exploited, unauthorized users may gain access to administrative functionality, sensitive application data, artificial intelligence workflows, or backend services depending upon how Langflow has been deployed within an organization’s environment.

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CVE-2026-56290 — Joomlack Page Builder

CISA also added CVE-2026-56290, an Improper Access Control vulnerability affecting Joomlack Page Builder.

Improper access control weaknesses occur when software fails to adequately restrict user permissions or enforce authorization policies. Successful exploitation could allow attackers to perform actions beyond their intended privileges, modify application content, access restricted resources, or further compromise vulnerable environments.

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Operational Impact

Although the three vulnerabilities affect different software platforms, they share one important characteristic: each has already been observed being exploited by threat actors.

Organizations operating vulnerable systems could face:

• Remote code execution
• Unauthorized administrative access
• Web shell deployment
• Credential theft
• Data exfiltration
• Privilege escalation
• Lateral movement throughout enterprise environments
• Malware or ransomware deployment
• Website compromise
• Long-term attacker persistence
• Business disruption

Attackers frequently combine vulnerabilities such as these with additional techniques after gaining initial access, allowing them to expand control beyond the originally compromised application.

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Federal Response

CISA added all three vulnerabilities to the Known Exploited Vulnerabilities Catalog under Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk.

The directive requires Federal Civilian Executive Branch (FCEB) agencies to rapidly remediate vulnerabilities included in the KEV Catalog, particularly those affecting publicly exposed systems capable of providing attackers with significant control following successful exploitation.

BOD 26-04 also requires agencies to determine whether affected systems were compromised before patches or mitigations were applied, recognizing that attackers may already have established access before remediation begins.

Although the directive applies specifically to federal civilian agencies, CISA continues encouraging private-sector organizations, state and local governments, educational institutions, healthcare providers, financial institutions, and critical infrastructure operators to prioritize remediation of all KEV-listed vulnerabilities as part of a risk-based vulnerability management program.

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Defensive Guidance

Organizations operating affected software should:

• Apply vendor security updates immediately.
• Review affected systems for indicators of compromise before and after remediation.
• Examine authentication, application, and system logs for unusual activity.
• Verify administrative accounts have not been modified or created without authorization.
• Remove unauthorized files, web shells, or suspicious scripts discovered during investigations.
• Restrict administrative privileges using the principle of least privilege.
• Conduct vulnerability scanning across internet-facing assets.
• Monitor outbound network traffic for suspicious communications.
• Reset privileged credentials if unauthorized access is suspected.
• Ensure endpoint detection and response (EDR) platforms are fully updated and actively monitoring affected systems.

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Forecast — 30 Days

• Continued internet-wide scanning for vulnerable JoomShaper, Langflow, and Joomlack installations.
• Increased exploitation attempts targeting unpatched public-facing servers.
• Additional malware campaigns leveraging these vulnerabilities for initial access.
• Higher incident response activity involving compromised content management and AI application environments.
• Additional KEV catalog updates as CISA identifies newly exploited vulnerabilities.
• Accelerated patch deployment efforts across government and private-sector organizations.

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TRJ Verdict

The addition of three separate vulnerabilities to CISA’s Known Exploited Vulnerabilities Catalog underscores the pace at which threat actors continue identifying and exploiting weaknesses across widely used enterprise software platforms. Once CISA confirms active exploitation, organizations should view KEV additions as immediate operational security alerts rather than routine vulnerability notifications.

Whether the vulnerability involves unrestricted file uploads, authorization bypass, or improper access controls, the operational risk remains the same: delaying remediation gives attackers additional opportunities to establish unauthorized access before defensive measures are implemented. Security teams should prioritize patch deployment, conduct comprehensive compromise assessments, and verify that vulnerable systems have not already been breached before considering remediation efforts complete.

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