What is CVE-2018-18753?

CVE-2018-18753 is a critical-severity vulnerability in Typecho, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2018-10-29.

How severe is CVE-2018-18753?

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

Is CVE-2018-18753 known to be exploited?

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

SSRF in Typecho

CVE-2018-18753

Typecho V1.1 allows remote attackers to send shell commands via base64-encoded serialized data, as demonstrated by SSRF.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2018-10-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.035 (88.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.035 · newest: 0.035 · change: 0.000

Affected products

Typecho — versions 1.1

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

Public proof-of-concept exploits

References

github.com/wuzhicms/wuzhicms/issues/157 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-18753?: CVE-2018-18753 is a critical-severity vulnerability in Typecho, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2018-10-29.
How severe is CVE-2018-18753?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-18753 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.