CVE-2021-23899
Arbitrary code injection in json-sanitizer
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-23899- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-611
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-23899- Updated
- 2026-11-02
EUVDEUVD-2021-1360 No score
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.
- Record
EUVD-2021-1360- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-mm8j-9x84-m9cv
Arbitrary code injection in json-sanitizer
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.
- Record
GHSA-mm8j-9x84-m9cv- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-611
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-23899- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-mm8j-9x84-m9cv
Arbitrary code injection in json-sanitizer
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.
- Record
GHSA-mm8j-9x84-m9cv- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-611
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
com.mikesamuel:json-sanitizerMaven |
before 1.2.2 | 1.2.2 |
com.mikesamuel:json-sanitizerMaven |
before 1.2.2, plus listed versions 1.01.11.2.01.2.1 |
1.2.2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-23899 is a critical vulnerability (CVSS 9.8) in Owasp Json-sanitizer, published January 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.09%, the 81st percentile. Fixed in com.mikesamuel:json-sanitizer 1.2.2.