# CVE-2026-71531: PrestaShop Webservice API Authorization Bypass via id_shop Parameter

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

PrestaShop before 8.2.9 and 9.2.1 contains an authorization flaw in the Webservice API that allows an attacker holding a key restricted to one shop to act on data of every shop by submitting requests with id_shop=all or id_shop_group=N, which expand the shop context without validating the key's actual shop associations and cause shopHasRight() to evaluate the expanded set as a disjunction. Attackers can exploit this flaw via classes/webservice/WebserviceRequest.php to read, modify, or delete data belonging to shops they are not authorized for, including full customer records such as email addresses, secure_key, and password hashes across the installation.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/PrestaShop/PrestaShop/releases/tag/9.2.1
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/PrestaShop/PrestaShop/releases/tag/8.2.9

## Affected products and versions

- PrestaShop / PrestaShop (PrestaShop/PrestaShop): ≥ 0; < 8.2.9 (affected, semver); ≥ 9.0.0; < 9.2.1 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.6 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N; source: CNA: VulnCheck

- CVSS 4.0: 8.6 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-863

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/PrestaShop/PrestaShop/security/advisories/GHSA-3f36-4qv4-vfgh (CNA: VulnCheck; vendor-advisory)

- https://github.com/PrestaShop/PrestaShop/releases/tag/9.2.1 (CNA: VulnCheck; release-notes, patch)

- https://github.com/PrestaShop/PrestaShop/releases/tag/8.2.9 (CNA: VulnCheck; release-notes, patch)

- https://www.vulncheck.com/advisories/prestashop-webservice-api-authorization-bypass-via-id-shop-parameter (CNA: VulnCheck; third-party-advisory)

- https://github.com/PrestaShop/PrestaShop/releases/tag/8.2.9 (disclosure@vulncheck.com)

- https://github.com/PrestaShop/PrestaShop/releases/tag/9.2.1 (disclosure@vulncheck.com)

- https://github.com/PrestaShop/PrestaShop/security/advisories/GHSA-3f36-4qv4-vfgh (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/prestashop-webservice-api-authorization-bypass-via-id-shop-parameter (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-71531; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-71531; retrieved 2026-11-14; source updated 2026-11-13

Revision: e97da2f76d2be167fd64bd1a8c61e71d315cd7218f9e2e31a67501b822a409a7

Canonical: https://y2.dev/cve/CVE-2026-71531

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