Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The swag/paypal Packagist package (Shopware's PayPal integration) is vulnerable in versions before 5.4.4. When JavaScript-based PayPal checkout methods such as PayPal Plus, Smart Payment Buttons, SEPA, Pay Later, Venmo, or credit card are used, the amount and item list sent to PayPal may differ from those in the created order. The source does not describe what an attacker needs to exploit this. Upgrade to version 5.4.4, or disable the affected payment methods or use the Security Plugin version 1.0.21 or later as a workaround.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0030, the 22nd percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:04 UTC First seen by agentprime
- 31 Oct 2026, 14:04 UTC Confirmed by OSV