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VulnerabilityPublished

CVE-2026-128042: OpenMage magento-lts · Race Condition

Affects OpenMage magento-ltsSource CVE Database V5

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Not known to be exploited · CVSS 6.3 Medium : upgrade to 20.19.0 when convenient.

Data as of 13 Nov 2026, 09:59 UTC

CVSS 4.0 base score
6.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (VulnCheck)CVSS 4.06.3
CNA (VulnCheck)CVSS 3.13.7
Patch
Available – fixed in 20.19.0, 21.0.0-beta3
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade magento-lts to 20.19.0; magento-lts to 21.0.0-beta3; openmage/magento-lts to 21.0.0-beta3 or 20.19.0.

Affected software

ProductAffectedFixed in
OpenMagemagento-ltsAffected
  • <20.19.0
Fixed in
  • 20.19.0
OpenMagemagento-ltsAffected
  • >=21.0.0-beta1 <21.0.0-beta3
Fixed in
  • 21.0.0-beta3
GitHubopenmage/magento-ltspkg:github/openmage/magento-ltsOther threatsAffected
  • <20.19.0
  • >=21.0.0-beta1 <21.0.0-beta3
Fixed in
  • 20.19.0
  • 21.0.0-beta3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

The issue is fixed in OpenMage magento-lts versions 20.19.0 and 21.0.0-beta3. Users should upgrade to these or later versions to remediate the vulnerability. No additional mitigations are indicated by the vendor advisory.

Description

OpenMage magento-lts versions before 20.19.0 and 21.0.0-beta3 contain a race condition in the shopping cart price rule usage limits. This flaw allows unauthenticated attackers, including guest shoppers, to exploit concurrent checkouts to redeem limited-use coupons more times than intended. The issue arises because the coupon usage counters are checked and incremented without proper synchronization, leading to improper enforcement of coupon limits.

References

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