CVE-2026-48939: iCagenda Unrestricted Upload of File with Dangerous Type Vulnerability

What it is

iCagenda contains an unrestricted upload of file with dangerous type vulnerability that allows the upload of arbitrary files in the file attachment feature, ultimately resulting in PHP code upload and execution.

What to do

Treat this as urgent. Identify every affected system, starting with anything internet-facing, and apply the vendor fix or mitigation within days. If you cannot patch quickly, isolate or disable the affected service and watch for signs of compromise.

Priority

Act now: Patch or mitigate internet-facing systems within days.

Severity (CVSS)

10 critical

CISA assessment (SSVC)

actively exploited; attackers can automate it at scale; total control of the affected system

Exploit probability (EPSS, 30 days)

20%, higher than 97% of all CVEs

Added to CISA KEV

10 July 2026

CISA fix-by date

13 July 2026 (US federal agencies; a sensible deadline for everyone)

Ransomware use

Not known

Weakness

CWE-434

References

• NIST NVD entry
• CISA KEV entry
• www.icagenda.com/
• github.com/Polosss/By-Poloss..-..CVE-2026-48939
• mysites.guru/blog/icagenda-zero-day-file-upload-rce/
• www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48939
• www.icagenda.com/docs/changelog/icagenda-3-9-15
• www.icagenda.com/docs/changelog/icagenda-4-0-8

Sources: CISA Known Exploited Vulnerabilities · FIRST Exploit Prediction Scoring System (EPSS) · NIST National Vulnerability Database · CISA Vulnrichment (SSVC), via the CVE Program. This product uses data from the NVD API but is not endorsed or certified by the NVD. Summaries are machine-written from CISA’s description; treat the vendor’s advisory as the authority for fixes.