Security readout for executives and security teams
Plain-English summary
CVE-2021-36739 is a medium-severity cross-site scripting issue in Apache Pluto’s MVCBean JSP portlet Maven archetype 3.1.0. The vulnerable first-name and last-name fields could let attacker-supplied script run in a user’s browser if a user interacts with affected deployed portlet code.
Executive priority
Treat as a scoped medium-risk web application issue. Prioritize confirmation of exposure first; escalate if the generated portlet code is internet-facing, used by privileged users, or embedded in a sensitive portal.
Technical view
The CVE describes CWE-79 XSS in org.apache.portals.pluto.archetype:mvcbean-jsp-portlet-archetype 3.1.0. CVSS 3.1 is 6.1: network attack vector, low complexity, no privileges, required user interaction, changed scope, low confidentiality and integrity impact, and no availability impact.
Likely exposure
Exposure is likely limited to applications or examples generated from the Apache Pluto MVCBean JSP portlet Maven archetype version 3.1.0 and deployed with the affected first-name and last-name fields reachable by users.
Exploitation context
The provided sources do not show known active exploitation, and the CVE is not listed as KEV. Exploitation requires user interaction and a reachable vulnerable portlet workflow, so urgency depends on whether generated archetype code was deployed beyond development or demonstration use.
Researcher notes
Evidence is narrow: the bundle names the vulnerable archetype, version 3.1.0, fields, CWE-79, and CVSS vector. It does not provide exploit details, observed exploitation, or a specific fixed version. Avoid broad claims about all Apache Portals deployments.
Mitigation direction
- Inventory Maven usage for mvcbean-jsp-portlet-archetype version 3.1.0.
- Identify deployed portlets generated from the affected archetype.
- Check Apache advisory guidance before selecting a fix path.
- Apply vendor-recommended updates or code changes when confirmed.
- Reduce untrusted access to affected workflows until remediation is complete.
Validation and detection
- Search dependency and build files for the affected Maven artifact and version.
- Review deployed portlet code for first-name and last-name field handling.
- Confirm whether affected generated code is externally reachable.
- Verify remediation against Apache’s published CVE or advisory information.
- Retest the relevant form workflow after remediation.
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-36739 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://lists.apache.org/thread/m5j87nn1lmvzp8b9lmh7gqq68g5lnb7pCVE reference · x_refsource_MISC
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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.