What is CVE-2023-45966?

CVE-2023-45966 is a high-severity vulnerability in Remark42, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2023-10-23.

How severe is CVE-2023-45966?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2023-45966 known to be exploited?

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

SSRF in Remark42

CVE-2023-45966

umputun remark42 version 1.12.1 and before has a Blind Server-Side Request Forgery (SSRF) vulnerability.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2023-10-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.1th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Remark42

Weakness classification (CWE)

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

Public proof-of-concept exploits

References

github.com/umputun/remark42/issues/1677 (Exploit, Third Party Advisory, Issue Tracking)
github.com/jet-pentest/CVE-2023-45966 (Third Party Advisory)

Frequently asked questions

What is CVE-2023-45966?: CVE-2023-45966 is a high-severity vulnerability in Remark42, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2023-10-23.
How severe is CVE-2023-45966?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2023-45966 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.