XXE in Owasp Json-Sanitizer
CVE-2021-23899
OWASP json-sanitizer before 1.2.2 may emit closing SCRIPT tags and CDATA section delimiters for crafted input. This allows an attacker to inject arbitrary HTML or XML into embedding documents.
Vulnerability class: XXE (XML External Entity)
EPSS: 0.021 (79.4th percentile) — read the EPSS interpretation.
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.
Affected products
- Owasp Json-sanitizer
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-23899?
- CVE-2021-23899 is a critical-severity vulnerability in Owasp Json-Sanitizer, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.8/10. Published 2021-01-13.
- How severe is CVE-2021-23899?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-23899 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.