CVE-2026-48939

iCagenda exploited vulnerability, confirmed exploited in the wild.

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.

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20%chance of exploitation in the next 30 days (EPSS), 97th percentile

10 Juladded to CISA's Known Exploited Vulnerabilities list, 2026

13 Julfederal remediation deadline, already passed

Passedpast the deadline: patch now

CISA's name for it	iCagenda Unrestricted Upload of File with Dangerous Type Vulnerability
Vendor and product	iCagenda · iCagenda
Type	exploited vulnerability · CWE-434
Exploited	Confirmed by CISA listed 10 July 2026
Likelihood	one of the most likely to be exploited of every vulnerability tracked
Deadline	13 July 2026 · already passed
Used in ransomware	Not reported
Advisories	www.icagenda.com ↗ · www.cisa.gov ↗ · www.cisa.gov ↗ · nvd.nist.gov ↗

What to do

Three steps, in this order

Step 1

Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited.

Step 2

If you cannot patch now, restrict network access to the affected product.

Step 3

Check for signs of compromise since the date it was added to the list.

CISA's 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.

CISA's 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.

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Questions

CVE-2026-48939 in short

Is CVE-2026-48939 being exploited?

Yes. CISA added CVE-2026-48939 to its Known Exploited Vulnerabilities catalogue on 10 July 2026, which it does only on evidence of exploitation in the wild.

What is the CISA deadline for CVE-2026-48939?

US federal agencies must remediate it by 13 July 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.

How likely is CVE-2026-48939 to be exploited in the next 30 days?

FIRST's Exploit Prediction Scoring System gives it 20%, the 97th percentile of every CVE it scores.

How do I fix CVE-2026-48939?

Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited. If you cannot patch now, restrict network access to the affected product. Check for signs of compromise since the date it was added to the list.

Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.