What is CVE-2023-4655?

CVE-2023-4655 is a medium-severity vulnerability in Instantcms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-08-31.

How severe is CVE-2023-4655?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Instantcms

CVE-2023-4655

Cross-site Scripting (XSS) - Reflected in GitHub repository instantsoft/icms2 prior to 2.16.1.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-08-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (38.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001

Affected products

Instantcms
Instantsoft Instantsoft/icms2 — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

huntr.dev/bounties/e2189ad5-b665-4ba5-b6c4-112e58ae9a97 (Exploit, Patch, Third Party Advisory)
github.com/instantsoft/icms2/commit/a6a30e7bc96cd2081707388046c0259870533da6 (Patch)

Frequently asked questions

What is CVE-2023-4655?: CVE-2023-4655 is a medium-severity vulnerability in Instantcms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-08-31.
How severe is CVE-2023-4655?: Medium severity. CVSS v3 base score is 6.1 out of 10.