Magento Signature verification bypass

published 2020-06-26 6 y ago modified 2026-09-08 2 mo ago also BIT-magento-2020-9588 , EUVD-2022-4261 , GHSA-j2r4-2cr6-h3r3

cvss: 7.2; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.9%; EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits: 0; none known

Magento versions 2.3.4 and earlier, 2.2.11 and earlier (see note), 1.14.4.4 and earlier, and 1.9.4.4 and earlier have an observable timing discrepancy vulnerability. Successful exploitation could lead to signature verification bypass.

Patch / fix

fixed in 3

packagist magento/community-edition 2.3.4-p2
packagist magento/core 1.9.4.5
bitnami magento 2.2.12, 2.3.5

Exploit prediction

2.92% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
GitHub	3.1	7.2	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
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
OSV	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	magento/community-edition	<2.3.4-p2	2.3.4-p2
packagist	magento/core	<1.9.4.5	1.9.4.5
packagist	magento/project-community-edition	<=2.0.2	no fix listed
bitnami	magento	>=2.2.0, <2.2.12 >=2.3.0, <2.3.5	2.2.12 2.3.5

Affected products

Adobe Magento

Classification

Weakness

CWE-203 Observable Discrepancy

References

helpx.adobe.com /security/products/magento/apsb20-22.html
web, vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2020-9588
advisory, web

Sources

Fencer Vulns 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.

Summary