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Medium, CVSS 6.1

Cross-site scripting in json-sanitizer

CVE-2020-13973GHSA-g8jj-899q-8x3j

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (com.mikesamuel:json-sanitizer 1.2.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
  • CVE-2020-13973: 1.12% estimated exploitation activity in the next 30 days; percentile 66.29 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

OWASP json-sanitizer before 1.2.1 allows XSS. An attacker who controls a substring of the input JSON, and controls another substring adjacent to a SCRIPT element in which the output is embedded as JavaScript, may be able to confuse the HTML parser as to where the SCRIPT element ends, and cause non-script content to be interpreted as JavaScript.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-g8jj-899q-8x3j

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2020-13973

Advisory: Cross-site scripting in json-sanitizer
IDs: CVE-2020-13973, GHSA-g8jj-899q-8x3j
Record: https://patchnext.com/advisories/cve-2020-13973 (revision 1, source checked 26 Oct 2026, 16:06 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: com.mikesamuel:json-sanitizer 1.2.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.mikesamuel:json-sanitizer: affected < 1.2.1; fixed in 1.2.1

## Suggested inspection (read-only)
- Maven com.mikesamuel:json-sanitizer: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on com.mikesamuel:json-sanitizer.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-g8jj-899q-8x3j (GitHub-reviewed advisory GHSA-g8jj-899q-8x3j lists affected ranges: Maven com.mikesamuel:json-sanitizer >=0 <1.2.1)

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