What’s Vulnerable › Vulnerabilities

CVE-2021-23899

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-13 · updated 2026-06-17
• Weakness: CWE-611

Description

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.

Affected products

• OWASP Json-Sanitizer: before 1.2.2 — fixed in 1.2.2

How to fix

Upgrade to a fixed version: OWASP Json-Sanitizer 1.2.2. Check the vendor advisory for mitigations.

References

• https://github.com/OWASP/json-sanitizer/commit/a37f594f7378a1c76b3283e0dab9e1ab1dc0247e
• https://github.com/OWASP/json-sanitizer/compare/v1.2.1...v1.2.2
• https://groups.google.com/g/json-sanitizer-support/c/dAW1AeNMoA0
• https://github.com/OWASP/json-sanitizer/commit/a37f594f7378a1c76b3283e0dab9e1ab1dc0247e
• https://github.com/OWASP/json-sanitizer/compare/v1.2.1...v1.2.2
• https://groups.google.com/g/json-sanitizer-support/c/dAW1AeNMoA0

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