How severe is CVE-2022-0378?

CVE-2022-0378 has a CVSS score of 7.1/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2022-0378?

CVE-2022-0378 affects the following packages: microweber/microweber (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2022-0378?

Update microweber/microweber to 1.2.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-0378 is resolved across your whole dependency graph.

How do I detect CVE-2022-0378 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-2022-0378 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2022-0378 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2022-0378, 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-2022-0378?

CVE-2022-0378 has an EPSS (Exploit Prediction Scoring System) score of 3.9%, placing it in the 90th 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 indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2022-0378?

CVE-2022-0378 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Is there exploit tooling available for CVE-2022-0378?

A Nuclei detection template exists for CVE-2022-0378, 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-2022-0378 published, and has it been updated?

CVE-2022-0378 was published on January 26, 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-2022-0378 — microweber

HIGHFix: microweber/microweber@fc7e1a0

CVE-2022-0378 is a high-severity (CVSS 7.1) Cross-site Scripting (XSS) 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.

Cross-site Scripting (XSS) - Reflected in microweber/microweber

Also known asGHSA-3j58-p785-f27x

Published

Jan 26, 2022

Updated

Aug 12, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

3.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs90th percentile — riskier than 90% of all scored CVEsHighest risk

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

How urgent is this, really

CVE-2022-0378 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 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

🐘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

Cross-site Scripting (XSS) - Reflected 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.

Cross-site Scripting (XSS) - Reflected in Packagist microweber/microwebe…

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-2022-0378 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

How to detect CVE-2022-0378

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

nuclei -id cve-2022-0378 -u https://target

Template: Microweber Cross-Site Scripting
Severity: medium
Impact: Successful exploitation of this vulnerability could allow an attacker to execute arbitrary JavaScript code in the context of the victim's browser, leading to session hijacking, defacement, or theft of sensitive information.
Remediation: Apply the latest security patch or upgrade to a version that has addressed the vulnerability.

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

Frequently Asked Questions

There is a reflected cross sitem scripting attack in microweber via url parameters.

O3 Security · Impact-Aware SCA

Is CVE-2022-0378 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

7.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

Raw vector

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

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

Timeline

Disclosed

Jan 26, 2022

First exploit

Feb 2, 2022

7 days after disclosure — rapid exploitation

Last updated

Aug 12, 2026

Identifiers

CVE-2022-0378

GHSA-3j58-p785-f27x

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