Cyber Resilience

CVE-2026-30121

Critical

Published: 15 June 2026

Published
15 June 2026
Modified
17 June 2026
KEV Added
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Patch
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CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS Score 0.0032 24.2th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-30121 is a critical-severity Write-what-where Condition (CWE-123) vulnerability in Remotion Remotion. Its CVSS base score is 9.1 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 24.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

remotion-dev remotion v4.0.409 was discovered to contain an arbitrary file write vulnerability.

CWE(s)
CWE-123

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1105 Ingress Tool Transfer Command And Control
Adversaries may transfer tools or other files from an external system into a compromised environment.
attack.mitre.org →
Why these techniques?

Arbitrary file write in Remotion (public-facing app context) directly enables T1190 for initial access and T1105 for writing/transferring payloads or tools to disk.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Affected Assets

remotion
remotion
4.0.409

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-123

Write-what-where primitives are neutralized when the attacker cannot execute the memory they control.

References