Security readout for executives and security teams
Plain-English summary
think-helper, a helper library for ThinkJS, had a prototype pollution flaw before version 1.1.3. If an application let upstream-controlled input update object attributes, attackers could alter inherited object behavior and cause integrity impacts. The source bundle names version 1.1.3 as patched.
Executive priority
Treat as high priority for affected internet-facing services because the flaw needs no privileges or user interaction and can affect data integrity. Scope first; patch confirmed vulnerable deployments promptly.
Technical view
CVE-2021-32736 is CWE-1321 prototype pollution in thinkjs/think-helper versions before 1.1.3. CVSS 3.1 is 7.5, network-accessible, low complexity, no privileges, no user interaction, with high integrity impact. Sources do not provide exploit details.
Likely exposure
Exposure is likely limited to ThinkJS or Node.js applications that include think-helper below 1.1.3 and pass upstream-controlled attribute data into affected helper functions.
Exploitation context
The provided bundle does not show CISA KEV listing or cited evidence of active exploitation. It supports a plausible remote integrity risk, but not confirmed exploitation in the wild.
Researcher notes
The source bundle identifies product, affected range, fixed version, CWE, and CVSS vector, but does not include proof-of-concept behavior, exploit preconditions beyond upstream-controlled attributes, or confirmed active exploitation.
Mitigation direction
- Upgrade think-helper to version 1.1.3 or later.
- Review dependency lockfiles for transitive think-helper versions below 1.1.3.
- Check the GitHub advisory for any updated vendor guidance.
- Prioritize applications that process external object-shaped input.
Validation and detection
- Inventory applications using ThinkJS or think-helper.
- Confirm installed think-helper versions in package manifests and lockfiles.
- Identify code paths passing untrusted attributes into helper object-update logic.
- Run regression tests covering object merge and request input handling.
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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CWE-1321: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-32736 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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:N/S:U/C:N/I:H/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/thinkjs/think-helper/security/advisories/GHSA-vr5m-3h59-7jcpCVE reference · x_refsource_CONFIRM
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.
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.