CVE-2026-128047 PUBLISHED

OpenMage magento-lts before 20.18.2 Account Takeover via Predictable Confirmation Key

Assigner: VulnCheck
Reserved: 12.11.2026 Published: 13.11.2026 Updated: 13.11.2026

OpenMage magento-lts before 20.18.2 and 21.0.0-beta pre-releases before 21.0.0-beta3 generate customer email-confirmation keys with md5(uniqid()) and customer and administrator password-reset tokens with the non-cryptographic uniqHash(). Unauthenticated attackers can brute-force the roughly 20-bit confirmation key via the unrate-limited confirmAction endpoint to log in as pending customers, or predict administrator reset tokens after recovering generator state.

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	High	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 8.1

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	OpenMage
Product	magento-lts
Versions	Default: unaffected affected from 0 to 20.18.2 (excl.) Version 20.18.2 is unaffected

Vendor	OpenMage
Product	magento-lts
Versions	Default: unaffected affected from 21.0.0-beta1 to 21.0.0-beta3 (excl.) Version 21.0.0-beta3 is unaffected

Credits

alimony reporter
Abhi-Hackz reporter
hariprasanth9317-tech finder
philipsorensen remediation developer
colinmollenhour remediation developer

References

Problem Types

Use of Insufficiently Random Values CWE