What is CVE-2023-4878?

CVE-2023-4878 is a medium-severity vulnerability in Instantcms, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.4/10. Published 2023-09-10.

How severe is CVE-2023-4878?

Medium severity. CVSS v3 base score is 5.4 out of 10.

SSRF in Instantcms

CVE-2023-4878

Server-Side Request Forgery (SSRF) in GitHub repository instantsoft/icms2 prior to 2.16.1-git.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2023-09-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (29.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Instantcms
Instantsoft Instantsoft/icms2 — versions unspecified

Weakness classification (CWE)

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

References

huntr.dev/bounties/655c4f77-04b2-4220-bfaf-a4d99fe86703 (Exploit, Patch, Third Party Advisory, Issue Tracking)
github.com/instantsoft/icms2/commit/d0aeeaf5979fbdbf80dc3a3227d6c58442ab7487 (Patch)

Frequently asked questions

What is CVE-2023-4878?: CVE-2023-4878 is a medium-severity vulnerability in Instantcms, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.4/10. Published 2023-09-10.
How severe is CVE-2023-4878?: Medium severity. CVSS v3 base score is 5.4 out of 10.