What is CVE-2023-49733?

CVE-2023-49733 is a critical-severity vulnerability in Apache Cocoon, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.8/10. Published 2023-11-30.

How severe is CVE-2023-49733?

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

XXE in Apache Cocoon

CVE-2023-49733

Improper Restriction of XML External Entity Reference vulnerability in Apache Cocoon.This issue affects Apache Cocoon: from 2.2.0 before 2.3.0. Users are recommended to upgrade to version 2.3.0, which fixes the issue.

Vulnerability class: XXE (XML External Entity)

Published 2023-11-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.8th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Apache Cocoon
Apache Software Foundation Cocoon — versions 2.2.0

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

lists.apache.org/thread/t87nntzt6dxw354zbqr9k7l7o1x8gq11 (vendor-advisory, Mailing List, Vendor Advisory)
www.openwall.com/lists/oss-security/2023/11/30/5 (Mailing List)

Frequently asked questions

What is CVE-2023-49733?: CVE-2023-49733 is a critical-severity vulnerability in Apache Cocoon, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.8/10. Published 2023-11-30.
How severe is CVE-2023-49733?: Critical severity. CVSS v3 base score is 9.8 out of 10.