Security readout for executives and security teams
Plain-English summary
This is a cross-site scripting flaw in Liferay’s Asset Publisher. A remote attacker could cause affected Liferay pages to render attacker-controlled script or HTML through a specific Asset Publisher parameter. That can threaten portal users and sessions, but the bundle provides no CVSS score and no evidence of active exploitation.
Executive priority
Treat this as a normal-priority web application patching item unless the affected portal is internet-facing, handles sensitive sessions, or is heavily used by privileged users. Escalate if vulnerable versions are confirmed on public portals.
Technical view
CVE-2021-29051 affects Liferay Portal 7.2.1 through 7.3.5 and Liferay DXP 7.1 before FP21, 7.2 before FP10, and 7.3 before FP1. The vulnerable input is the Asset Publisher assetEntryId parameter, enabling arbitrary web script or HTML injection.
Likely exposure
Organizations running the listed Liferay Portal or DXP versions with Asset Publisher pages exposed to users or the internet are the likely exposure group. The source bundle does not identify affected CPEs or deployment prerequisites beyond product versions.
Exploitation context
The sources describe remote attacker capability for script or HTML injection. They do not state authentication requirements, exploitation in the wild, public exploit availability, or CISA KEV listing. Active exploitation should not be assumed from this bundle.
Researcher notes
The bundle lacks CVSS, CWE, authentication details, and proof-of-concept status. Validation should focus on version and component exposure, not exploit reproduction. The affected parameter name indicates the vulnerable path is within Asset Publisher request handling.
Mitigation direction
- Upgrade Liferay DXP to the named fixed fix pack level or later.
- For Liferay Portal, check Liferay’s advisory for the appropriate fixed release path.
- Reduce public exposure of vulnerable Asset Publisher pages where feasible.
- Apply standard XSS monitoring and session protection controls while patching.
Validation and detection
- Inventory Liferay Portal and DXP versions across production and staging.
- Identify pages using the Asset Publisher app in affected versions.
- Confirm DXP fix pack levels meet or exceed the advisory thresholds.
- Review web logs for suspicious Asset Publisher assetEntryId requests.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-2021-29051 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
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ADP provider summaries
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.