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HIGH severity

CVE-2021-23335 — is-user-valid

HIGH

CVE-2021-23335 is a high-severity (CVSS 7.5) CWE-74 vulnerability in is-user-valid. 1 public exploit reference exists, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

LDAP Injection in is-user-valid

Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Sep 28, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs72th percentile — riskier than 72% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-23335 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

0other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
is-user-validnpm
1downloads / week

Description

All versions of package is-user-valid are vulnerable to LDAP Injection which can lead to either authentication bypass or information exposure.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
📦npmis-user-validall versionsNo fix

Affected Products

1 product · 1 configurations
Application
is-user-validis-user-valid_project
all
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

All versions of package is-user-valid are vulnerable to LDAP Injection w…

snyk.ioNVDFeb 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for is-user-valid, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    No patched version of is-user-valid has shipped for CVE-2021-23335 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

All versions of package is-user-valid are vulnerable to LDAP Injection which can lead to either authentication bypass or information exposure.
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CVE-2021-23335: is-user-valid: LDAP Injection