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Critical, CVSS 9.3Exploited · CISA KEV

Deserialization of Untrusted Data in Liferay Portal

CVE-2020-7961GHSA-w7pm-cc4v-f3g8

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (com.liferay.portal:com.liferay.portal.kernel 4.35.3), 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
Confirmed: listed in the CISA Known Exploited Vulnerabilities catalog.
CVSS 4.0
9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A · score source
EPSS
  • CVE-2020-7961: 99.91% estimated exploitation activity in the next 30 days; percentile 99.97 (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.

Deserialization of Untrusted Data in Liferay Portal prior to 7.2.1 CE GA2 allows remote attackers to execute arbitrary code via JSON web services (JSONWS).

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

    Published from ghsa record GHSA-w7pm-cc4v-f3g8

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-2020-7961

Advisory: Deserialization of Untrusted Data in Liferay Portal
IDs: CVE-2020-7961, GHSA-w7pm-cc4v-f3g8
Record: https://patchnext.com/advisories/cve-2020-7961 (revision 1, source checked 26 Oct 2026, 16:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.3)
Exploitation: confirmed: listed in the CISA Known Exploited Vulnerabilities catalog.
Vendor response: Vendor fix available; fixed versions by package: com.liferay.portal:com.liferay.portal.kernel 4.35.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.liferay.portal:com.liferay.portal.kernel: affected < 4.35.3; fixed in 4.35.3

## Suggested inspection (read-only)
- Maven com.liferay.portal:com.liferay.portal.kernel: 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.liferay.portal:com.liferay.portal.kernel.
- 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?
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-w7pm-cc4v-f3g8 (GitHub-reviewed advisory GHSA-w7pm-cc4v-f3g8 lists affected ranges: Maven com.liferay.portal:com.liferay.portal.kernel >=0 <4.35.3)
- Verified: https://www.cisa.gov/known-exploited-vulnerabilities-catalog (CISA added CVE-2020-7961 to the Known Exploited Vulnerabilities catalog on 2021-11-03.)

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