Arbitrary File Upload Vulnerability in iCagenda Extension for Joomla
CVE-2026-48939

10CRITICAL

Key Information:

Vendor

Icagenda.com

Status
Icagenda Extension For Joomla
Vendor
CVE Published:
20 June 2026

Badges

📈 Score: 1,020👾 Exploit Exists🟣 EPSS 82%🦅 CISA Reported

What is CVE-2026-48939?

CVE-2026-48939 is a vulnerability found in the iCagenda extension for Joomla, a popular content management system that facilitates event management and scheduling functionalities for users. This specific vulnerability allows for arbitrary file uploads through the extension's file attachment feature. When exploited, it enables attackers to upload malicious PHP scripts, which can then be executed on the server. The ability to execute custom code poses a serious threat, as it can lead to unauthorized system access, data breaches, and a compromise of the entire server environment. Organizations utilizing Joomla with the iCagenda extension are at risk of this vulnerability, which can significantly undermine the security of their web applications and related data.

Potential impact of CVE-2026-48939

  1. Unauthorized Code Execution: The most critical impact of CVE-2026-48939 is the potential for malicious actors to execute arbitrary PHP code on the server. This could lead to full control of the affected system, allowing attackers to manipulate or steal sensitive data, deploy malware, or use the server as part of a larger botnet.

  2. Data Breaches: Exploiting this vulnerability can result in significant data breaches where confidential user information, including personal and financial data, may be exposed or exfiltrated. Such incidents not only harm the organization’s reputation but also violate privacy laws and regulations, potentially resulting in legal repercussions.

  3. Compromise of Website Integrity: Organizations could face disruptions due to the compromise of their website's integrity. Attackers exploiting this vulnerability could alter site content, deliver phishing pages, or spread malware to end users, undermining trust and potentially resulting in loss of customers or users.

CISA has reported CVE-2026-48939

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2026-48939 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: 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.

Affected Version(s)

iCagenda extension for Joomla 3.2.1-4.0.7

References

https://www.icagenda.com/
product

EPSS Score

82% chance of being exploited in the next 30 days.

CVSS V4

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • 🦅

    CISA Reported

  • Vulnerability published

  • Vulnerability Reserved

Credit

Phil Taylor
.