How severe is CVE-2022-0666?

CVE-2022-0666 has a CVSS score of 7.6/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2022-0666?

CVE-2022-0666 affects the following packages: microweber/microweber (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2022-0666?

Update microweber/microweber to 1.2.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-0666 is resolved across your whole dependency graph.

How do I detect CVE-2022-0666 in my Packagist dependencies?

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

How do I mitigate CVE-2022-0666 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2022-0666 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2022-0666, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2022-0666?

CVE-2022-0666 has an EPSS (Exploit Prediction Scoring System) score of 44.3%, placing it in the 99th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

What type of vulnerability is CVE-2022-0666?

CVE-2022-0666 is classified as CWE-93 (CWE-93). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Is there exploit tooling available for CVE-2022-0666?

A Nuclei detection template exists for CVE-2022-0666, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2022-0666 published, and has it been updated?

CVE-2022-0666 was published on February 18, 2022 and was last updated on August 12, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

HIGH severity

CVE-2022-0666 — microweber

HIGHFix: microweber/microweber@f0e338f

CVE-2022-0666 is a high-severity (CVSS 7.6) CWE-93 vulnerability in microweber/microweber. 1 public exploit reference exists, so weaponization risk is real. A fix is available for microweber/microweber — see the affected versions and patch details below.

CRLF Injection leads to Stack Trace Exposure due to lack of filtering at https://demo.microweber.org/ in microweber/microweber

Also known asGHSA-3wwj-wh2w-g4xp

Published

Feb 18, 2022

Updated

Aug 12, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

44.3%probability of exploitation in next 30 days

High Risk0.00%

Lower risk than most CVEs99th percentile — riskier than 99% of all scored CVEsHighest risk

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

How urgent is this, really

CVE-2022-0666 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 10–50% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

🐘microweber/microweber

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

CRLF Injection leads to Stack Trace Exposure due to lack of filtering at https://demo.microweber.org/ in Packagist microweber/microweber prior to 1.2.11.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`microweber/microweber`	all versions	1.2.11`composer require microweber/microweber:^1.2.11`

Affected Products

1 product · 1 configurations

Application

microwebermicroweber

< 1.2.11

range

Exploits & PoCs

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

CRLF Injection leads to Stack Trace Exposure due to lack of filtering at…

huntr.devNVDFeb 2022

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for microweber/microweber, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update microweber/microweber to 1.2.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-0666 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How to detect CVE-2022-0666

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2022-0666 -u https://target

Template: Microweber < 1.2.11 - CRLF Injection
Severity: high
Impact: Attackers can inject CRLF sequences via the redirect_to parameter to set arbitrary cookies or inject additional HTTP headers, potentially facilitating session hijacking or cache poisoning attacks.
Remediation: Upgrade to Microweber version 1.2.11 or later.

Template by ProjectDiscovery nuclei-templates (ritikchaddha), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

CRLF Injection leads to Stack Trace Exposure due to lack of filtering at https://demo.microweber.org/ in Packagist microweber/microweber prior to 1.2.11.

O3 Security · Impact-Aware SCA

Is CVE-2022-0666 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

7.6/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

High

Raw vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

CWE Classification

Weaponization

OpenSSF Scorecard

Package health score

microweber

3.8/10

Code-Review0/10

Maintained0/10

Branch-ProtectionN/A

Assessed Oct 5, 2026

Timeline

Disclosed

Feb 18, 2022

First exploit

Feb 26, 2022

Last updated

Aug 12, 2026

Identifiers

CVE-2022-0666

GHSA-3wwj-wh2w-g4xp

References

Advisorygithub.com Advisorynvd.nist.gov Fixgithub.com Webhuntr.dev Packagegithub.com

Related vulnerabilities

This CVE is high severity — higher than any of the other 8 CVEs affecting microweber/microweber (highest there: moderate).

CVE-2026-12198CVE-2025-70791CVE-2025-70792CVE-2025-51504CVE-2025-51501CVE-2025-51502CVE-2025-51503CVE-2025-34076

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedAug 12, 2026