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High, CVSS 7.5

XSS in enshrined/svg-sanitize due to mishandled script and data values in attributes

CVE-2019-18857GHSA-gf8j-v8x5-h9qp

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (enshrined/svg-sanitize 0.12.0), 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
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
  • CVE-2019-18857: 1.04% estimated exploitation activity in the next 30 days; percentile 63.95 (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.

enshrined/svg-sanitize before 0.12.0 mishandles script and data values in attributes, as demonstrated by unexpected whitespace such as in the javascript	:alert substring.

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

    Published from ghsa record GHSA-gf8j-v8x5-h9qp

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-2019-18857

Advisory: XSS in enshrined/svg-sanitize due to mishandled script and data values in attributes
IDs: CVE-2019-18857, GHSA-gf8j-v8x5-h9qp
Record: https://patchnext.com/advisories/cve-2019-18857 (revision 1, source checked 26 Oct 2026, 13:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: enshrined/svg-sanitize 0.12.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist enshrined/svg-sanitize: affected < 0.12.0; fixed in 0.12.0

## Suggested inspection (read-only)
- Packagist enshrined/svg-sanitize: 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 enshrined/svg-sanitize.
- 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-gf8j-v8x5-h9qp (GitHub-reviewed advisory GHSA-gf8j-v8x5-h9qp lists affected ranges: Packagist enshrined/svg-sanitize >=0 <0.12.0)

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