CVE-2021-23899
CRITICAL
9.8
CVSS Score
Published: January 13, 2021 at 03:49 PM UTC
Updated: June 17, 2026 at 03:39 AM UTC
1 product affected across 1 vendorJSON Sanitizer
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Severity
CRITICAL9.8
Exploit prediction
EPSS 2%
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
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 1.2.2
Affected range stops below 1.2.2, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (3)
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/OWASP/json-sanitizer/commit/a37f594f7378a1c76b3283e0dab9e1ab1dc0247ex_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/OWASP/json-sanitizer/compare/v1.2.1...v1.2.2x_refsource_MISCThird Party Advisory
Source: [email protected]
https://groups.google.com/g/json-sanitizer-support/c/dAW1AeNMoA0CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-611
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