What is CVE-2023-40876?

CVE-2023-40876 is a medium-severity vulnerability in Dedecms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-08-24.

How severe is CVE-2023-40876?

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

Is CVE-2023-40876 known to be exploited?

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

XSS in Dedecms

CVE-2023-40876

DedeCMS up to and including 5.7.110 was discovered to contain a cross-site scripting (XSS) vulnerability at /dede/freelist_add.php via the title parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-08-24 · 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:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.4% 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: 0.004 · change: 0.000

Affected products

Dedecms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/DiliLearngent/BugReport/blob/main/php/DedeCMS/xss3.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-40876?: CVE-2023-40876 is a medium-severity vulnerability in Dedecms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-08-24.
How severe is CVE-2023-40876?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2023-40876 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.