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Medium, CVSS 6.1

Cross-site Scripting in Nacos

CVE-2021-44667GHSA-4gr7-qw2q-jxh6

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (com.alibaba.nacos:nacos-common 2.1.0-BETA, 1.4.5), 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-2021-44667: 0.83% estimated exploitation activity in the next 30 days; percentile 57.63 (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.

A Cross Site Scripting (XSS) vulnerability exists in Nacos prior to 1.4.5 and 2.1.0-BETA in auth/users via the (1) pageSize and (2) pageNo parameters.

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

    Published from ghsa record GHSA-4gr7-qw2q-jxh6

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-2021-44667

Advisory: Cross-site Scripting in Nacos
IDs: CVE-2021-44667, GHSA-4gr7-qw2q-jxh6
Record: https://patchnext.com/advisories/cve-2021-44667 (revision 1, source checked 26 Oct 2026, 16:39 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.alibaba.nacos:nacos-common 2.1.0-BETA, 1.4.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.alibaba.nacos:nacos-common: affected >= 2.0.0-ALPHA.1, < 2.1.0-BETA; < 1.4.5; fixed in 1.4.5, 2.1.0-BETA

## Suggested inspection (read-only)
- Maven com.alibaba.nacos:nacos-common: 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.alibaba.nacos:nacos-common.
- 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-4gr7-qw2q-jxh6 (GitHub-reviewed advisory GHSA-4gr7-qw2q-jxh6 lists affected ranges: Maven com.alibaba.nacos:nacos-common >=2.0.0-ALPHA.1 =0 <1.4.5)

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