What is CVE-2023-45554?

CVE-2023-45554 is a critical-severity vulnerability in Zzzcms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2023-10-25.

How severe is CVE-2023-45554?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-45554 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Arbitrary file upload in Zzzcms

CVE-2023-45554

File Upload vulnerability in zzzCMS v.2.1.9 allows a remote attacker to execute arbitrary code via modification of the imageext parameter from jpg, jpeg,gif, and png to jpg, jpeg,gif, png, pphphp.

Vulnerability class: Unrestricted File Upload

Published 2023-10-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (73.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Zzzcms — versions 2.1.9

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

Public proof-of-concept exploits

References

github.com/96xiaopang/Vulnerabilities/blob/main/zzzcms任意文件上传_en.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-45554?: CVE-2023-45554 is a critical-severity vulnerability in Zzzcms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2023-10-25.
How severe is CVE-2023-45554?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-45554 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.