CVE-2026-45225

HighPublic PoC

Published: 12 May 2026

Published

12 May 2026

Modified

14 May 2026

KEV Added

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Patch

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CVSS Score v4 7.2 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Score 0.0036 27.4th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-45225 is a high-severity Path Traversal (CWE-22) vulnerability. Its CVSS base score is 7.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Web Shell (T1505.003); ranked at the 27.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-29850

Vulnerability details

Heym before 0.0.21 contains a path traversal vulnerability in the file upload endpoint that allows authenticated users to write attacker-controlled files to arbitrary locations by supplying a crafted filename with traversal sequences. Attackers can exploit the unvalidated filename parameter in…

the upload_file() handler to bypass path restrictions and write, read, or delete files outside the intended storage directory.

CWE(s): CWE-22

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1505.003 Web Shell Persistence

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

attack.mitre.org →

T1070.004 File Deletion Stealth

Adversaries may delete files left behind by the actions of their intrusion activity.

attack.mitre.org →

Why these techniques?

Path traversal in authenticated file upload directly enables arbitrary file write/read/delete, facilitating web shell deployment (T1100/T1505.003) and file deletion for defense evasion (T1070.004).

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