CVE-2026-30345

High

Published: 18 March 2026

Published

18 March 2026

Modified

27 April 2026

KEV Added

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Patch

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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Score 0.0008 23.8th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-30345 is a high-severity Relative Path Traversal (CWE-23) vulnerability in Ctfd (inferred from references). Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 23.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-30345 is a zip slip vulnerability (CWE-23) in the Admin import functionality of CTFd version 3.8.1-18-gdb5a18c4. Published on 2026-03-18, it enables attackers to write arbitrary files outside the intended directories by supplying a crafted import file.

With a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N), the vulnerability is exploitable over the network with low complexity, no privileges, and no user interaction. Unauthenticated attackers can leverage the Admin import feature to perform arbitrary file writes, resulting in high integrity impact without affecting confidentiality or availability.

The CTFd project blog at https://blog.ctfd.io/ctfd-3-8-2/ details version 3.8.2, which addresses this issue. Further information is available in the CTFd GitHub repository (https://github.com/CTFd/CTFd), security policy (https://github.com/CTFd/CTFd/security/policy), and a dedicated CVE repository (https://github.com/syphonetic/CVE-2026-30345).

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-12868

Vulnerability details

A zip slip vulnerability in the Admin import functionality of CTFd v3.8.1-18-gdb5a18c4 allows attackers to write arbitrary files outside the intended directories via supplying a crafted import.

CWE(s): CWE-23

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 →

T1505.003 Web Shell Persistence

Adversaries may backdoor web servers with web shells to establish persistent access to systems.

attack.mitre.org →

Why these techniques?

Unauthenticated network exploitation of public-facing CTFd Admin import (T1190) directly enables arbitrary file write outside intended paths via zip slip, which facilitates deployment of a web shell (T1505.003) for code execution.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1