CVE-2021-23899 json
Arbitrary code injection in json-sanitizer
published 2021-01-13 5 y ago modified 2026-06-17 4 mo ago also GHSA-mm8j-9x84-m9cv , EUVD-2021-1360
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.1%
- EPSS 2.1% chance of exploitation in 30 days, percentile 81%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- maven com.mikesamuel:json-sanitizer 1.2.2
- owasp json-sanitizer 1.2.2
Exploit prediction
2.09% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | com.mikesamuel:json-sanitizer | <1.2.2 |
1.2.2 |
Classification
- Weakness
-
- CWE-611 Improper Restriction of XML External Entity Reference
References
-
github.com
/OWASP/json-sanitizer/commit/a37f594f7378a1c76b3283e0dab9e1ab1dc0247e
web, patch, third-party-advisory
-
github.com
/OWASP/json-sanitizer/compare/v1.2.1...v1.2.2
web, patch, third-party-advisory
-
groups.google.com
/g/json-sanitizer-support/c/dAW1AeNMoA0
web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-23899
advisory
Sources
- CVE List CVE-2021-23899
- GitHub Advisory GHSA-mm8j-9x84-m9cv
- NVD CVE-2021-23899
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