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FORENSIA

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Verdict

HIGH SEVERITY (CVSS 8.1)

What is this: Impact: The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did… (CWE-94) Affects Lodash Lodash.
Should you care: Rated high severity — CVSS 8.1.
What to do: Patch when able.

OBSERVEDMODERATE EVIDENCE COVERAGEDeterministic · stored evidence only

Vulnerability investigation

Prioritize by applicability, impact, and exploitation evidence

The available snapshot does not list this vulnerability in CISA KEV; that is not proof exploitation has not occurred. NVD rates the technical severity high at CVSS 8.1. These are public vulnerability signals, not proof that a specific environment runs an affected version.

Exploitation status

No KEV listing in available snapshot

Absence from KEV does not establish absence of exploitation.

30-day exploitation likelihood

Unavailable

FIRST EPSS did not return a score.

Technical severity

8.1 · high

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected surface

4 parsed products

Lodash Lodash, Lodash Lodash-Amd, Lodash Lodash-Es

Weakness class

CWE-94

CWE describes the weakness category, not whether a deployed product is reachable or exploitable.

Corpus evidence

1 connectors · 37 citations

No related report text is available in the local corpus.

What the evidence supports

Findings stay bounded to named sources and observable infrastructure.

2 findings

CVSS 8.1 high technical impact

HIGH

Network · High · None

NIST NVD CVSS

CVSS measures technical severity and prerequisites; it does not measure observed exploitation likelihood.

4 affected product mappings

MODERATE

Lodash Lodash, Lodash Lodash-Amd, Lodash Lodash-Es, Lodash Lodash.Template

NVD CPE / CISA product metadata

Product names are candidate applicability pivots. Confirm exact deployed versions and vendor ranges before remediation decisions.

What remains unknown

Whether your environment runs an affected product and version is not established by this public lookup.
Reachability, compensating controls, and successful exploitation in a specific environment are not checked.
CISA KEV absence is a point-in-time catalog result, not evidence that exploitation has never occurred.
No locally ingested public report supplies exploit, actor, or campaign context for this CVE.

What this is

Impact: The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. Both paths flow into the same Function() constructor sink. When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time. Additionally, _.template uses assignInWith to merge imports, which enumerates inherited properties via for..in. If Object.prototype has been polluted by any other vector, the polluted keys are copied into the imports object and passed to Function(). Patches: Users should upgrade to version 4.18.0. Workarounds: Do not pass untrusted input as key names in options.imports. Only use developer-controlled, static key names.

Evidence readiness

The base CVE appears first. Independent evidence is added without blocking the page.

Investigation status

Checking for newly completed evidence

Refreshing

NIST NVD

NVD evidence is available in this response

Ready

CISA KEV

Known-exploitation catalog check is pending

Pending

FIRST EPSS

Forensia does not request or publish EPSS while source rights are under review

Rights pending

Reports

Report links are still being resolved

Pending

Relationships

Product and vulnerability relationships are still being prepared

Pending

Vulnerability intel

Local EPSS row, KEV flag, and catalog notes from stored metadata only.

Not in KEV

CVE: CVE-2026-4800
EPSS probability: not fetched / unavailable
EPSS fetched_at: 2026-08-11T10:44:17.711697Z

Affected products

Vendor/product strings parsed from local CPE URIs (no inferred ATT&CK).

Product	CPE (truncated)
Lodash Lodash.Template	cpe:2.3:a:lodash:lodash.template::::::node.js::*
Lodash Lodash-Es	cpe:2.3:a:lodash:lodash-es::::::node.js::*
Lodash Lodash-Amd	cpe:2.3:a:lodash:lodash-amd::::::node.js::*
Lodash Lodash	cpe:2.3:a:lodash:lodash::::::node.js::*

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