# CVE-2026-128028: OpenMage magento-lts before 20.18.2 Stored XSS via Product Custom Option SVG Upload

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

OpenMage magento-lts before 20.18.2 and 21.0.0-beta1 before 21.0.0-beta3 contains a stored cross-site scripting vulnerability in Mage_Catalog_Model_Product_Option_Type_File, which accepts guest SVG, XHTML, or XML uploads through product File custom options with an empty allowed-extension list. Unauthenticated attackers can send the file URL under media/custom_options/ to victims, executing script in the store origin and exposing administrator sessions when the admin panel shares that origin.

## 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/OpenMage/magento-lts/commit/5b6f985785245a964aa3dc78609f6af44d9d5e27
- 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/OpenMage/magento-lts/commit/dd692b825ba50f196bcc20ae67fbed48dd95da56
- 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/OpenMage/magento-lts/commit/5896b2a60b10e892cec594391b2612ab53a4ce59

## Affected products and versions

- OpenMage / magento-lts: ≥ 0; < 20.18.2 (affected, semver); 20.18.2 (unaffected, semver). Source: CNA: VulnCheck
- OpenMage / magento-lts: ≥ 21.0.0-beta1; < 21.0.0-beta3 (affected, semver); 21.0.0-beta3 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 2.3 (low); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 4.7 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N; source: CNA: VulnCheck

- CVSS 4.0: 2.3 (low); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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: 4.7 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-79

## Exploit evidence

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

## References

- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-v7mx-rv47-452m (CNA: VulnCheck; vendor-advisory)

- https://github.com/OpenMage/magento-lts/commit/5b6f985785245a964aa3dc78609f6af44d9d5e27 (CNA: VulnCheck; patch)

- https://github.com/OpenMage/magento-lts/commit/dd692b825ba50f196bcc20ae67fbed48dd95da56 (CNA: VulnCheck; patch)

- https://github.com/OpenMage/magento-lts/commit/5896b2a60b10e892cec594391b2612ab53a4ce59 (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.18.2-stored-xss-via-product-custom-option-svg-upload (CNA: VulnCheck; third-party-advisory)

- https://github.com/OpenMage/magento-lts/commit/5896b2a60b10e892cec594391b2612ab53a4ce59 (disclosure@vulncheck.com)

- https://github.com/OpenMage/magento-lts/commit/5b6f985785245a964aa3dc78609f6af44d9d5e27 (disclosure@vulncheck.com)

- https://github.com/OpenMage/magento-lts/commit/dd692b825ba50f196bcc20ae67fbed48dd95da56 (disclosure@vulncheck.com)

- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-v7mx-rv47-452m (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.18.2-stored-xss-via-product-custom-option-svg-upload (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-128028; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-128028; retrieved 2026-11-13; source updated 2026-11-13

Revision: 54197aee3cff15478c9c3dabdad50cd27f94f37c7983fcd379d5a8c472f9c1b9

Canonical: https://y2.dev/cve/CVE-2026-128028

## Agent and API access

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- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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