CVE-2020-28337· NVD / CVE Program· CNA mitre

A directory traversal issue in the Utils/Unzip module in Microweber through 1.1.20 allows an authenticated attacker to gain remote code exec

Noroxi assessment

Priority: Monitor (action score 33/100)

Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
Probability of exploitation in the next 30 days: 16.6% (FIRST EPSS); higher than 97% of all records.
Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: microweber/microweber (Packagist) 1.2.3.

Low priority for now. Upgrade to microweber/microweber (Packagist) 1.2.3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A directory traversal issue in the Utils/Unzip module in Microweber through 1.1.20 allows an authenticated attacker to gain remote code execution via the backup restore feature. To exploit the vulnerability, an attacker must have the credentials of an administrative user, upload a maliciously constructed ZIP file with file paths including relative paths (i.e., ../../), move this file into the backup directory, and execute a restore on this file.

HighCVSS 7.2 · v3.1—Proof of concept Fix available

GHSA-pqcf-v8v5-jmcg

Published: Feb 15, 2021
Updated: Jun 16, 2026
EPSS: 16.6% · 97th percentile
CWE: CWE-22

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 28 / 40 · 7.2 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 5 / 30 · 16.6%

Get told when this record changes

Not in KEV: no record of exploitation in the wild
Proof of concept exists, no weaponized module
A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
microweber	microweber	cpe:2.3:a:microweber:microweber

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

microweber microweberup to 1.1.20 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Packagist	microweber/microweber	before 1.2.3	1.2.3

Same product

microweber: all records

Other highest-scoring records for the same primary product.

CVE-2022-0666CRLF Injection leads to Stack Trace Exposure due to lack of filtering at https://demo.microweber.org/ in microweber/microweber
43Plan
CVE-2022-0557OS Command Injection in microweber/microweber
43Plan
CVE-2025-34076Microweber CMS Authenticated Local File Inclusion via Backup API
40Plan

Published before and after this one in the same product

← EarlierCVE-2020-23139Nov 9, 2020 · Microweber 1.1.18 is affected by broken authentication and session management.
22Monitor
← EarlierCVE-2020-23140Nov 9, 2020 · Microweber 1.1.18 is affected by insufficient session expiration.
32Monitor
Later →CVE-2021-33988Oct 19, 2021 · Cross Site Scripting (XSS).
24Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Packagist:microweber/microweber	1.2.3	Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Exploit-DB entry	webapps	2021-05-10

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedFeb 15, 2021
First PoCMay 10, 2021+83 d
TodayOct 23, 2026+2075 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

microweber/microwebercommit 777ee9c

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

—

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

CVE-2020-2313998 days apartMicroweber 1.1.18 is affected by broken authentication and session management.
22Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
Administrator privileges are required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: High
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

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

nvd-primary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const file = path.join(ROOT, req.query.name);
2res.sendFile(file);

Fixed

1const file = path.resolve(ROOT, req.query.name);
2if (!file.startsWith(ROOT + path.sep)) {
3  return res.sendStatus(400);
4}
5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:47 PM UTC

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References

github.com/microweber/microweber/commit/777ee9c3e7519eb3672c79ac41066175b2001b50

Show all references (1 more)

sl1nki.page/advisories/CVE-2020-28337

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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