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Fencer Intel
high 7.2

CVE-2020-28337 in the critical feed json

Zip slip in Microweber

published 5y ago modified 4mo ago also GHSA-pqcf-v8v5-jmcg , EUVD-2022-1133

cvss
7.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
16.6%
EPSS 16.6% chance of exploitation in 30 days, percentile 97%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • packagist microweber/microweber 1.2.3

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Timeline

  1. Published
  2. First public exploit (EDB-49856)

Exploit prediction

16.61% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-49856 Microweber CMS 1.1.20 - Remote Code Execution (Authenticated) webapps, 2021-05-10
  • sl1nki.page https://sl1nki.page/blog/2021/02/01/microweber-zip-slip referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/162514/Microweber-CMS-1.1.20-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P
GitHub 3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist microweber/microweber
<1.2.3
1.2.3

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.