# CVE-2026-121733: Bagisto before 2.4.5 Stored XSS via RMA Conversation Attachment Upload

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

Bagisto before 2.4.5 contains a stored cross-site scripting vulnerability that allows authenticated customers to upload HTML files via the RMA send-message endpoint without type or extension validation. Attackers can upload a .html attachment containing JavaScript served under /storage/rma-conversation/, executing script in the shop's origin when an administrator opens it.

## 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/bagisto/bagisto/commit/204e43c26705b66ef2ddfb2a9eebb25f5e8f6a2c
- 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/bagisto/bagisto/commit/e28db3e8c53a94a99cf153ac338466720acd9004

## Affected products and versions

- Webkul / Bagisto (bagisto/bagisto): ≥ 0; < 2.4.5 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 2.1 (low); CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N; source: CNA: VulnCheck

- CVSS 4.0: 2.1 (low); CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/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: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/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-434

## Exploit evidence

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

## References

- https://github.com/bagisto/bagisto/commit/204e43c26705b66ef2ddfb2a9eebb25f5e8f6a2c (CNA: VulnCheck; patch)

- https://github.com/bagisto/bagisto (CNA: VulnCheck; product)

- https://github.com/bagisto/bagisto/commit/e28db3e8c53a94a99cf153ac338466720acd9004 (CNA: VulnCheck; patch)

- https://github.com/bagisto/bagisto/blob/v2.4.4/packages/Webkul/Shop/src/Http/Controllers/Customer/Account/RMAController.php#L408 (CNA: VulnCheck; technical-description)

- https://github.com/bagisto/bagisto/releases/tag/v2.4.5 (CNA: VulnCheck; release-notes)

- https://www.vulncheck.com/advisories/bagisto-before-2.4.5-stored-xss-via-rma-conversation-attachment-upload (CNA: VulnCheck; third-party-advisory)

- https://github.com/bagisto/bagisto (disclosure@vulncheck.com)

- https://github.com/bagisto/bagisto/blob/v2.4.4/packages/Webkul/Shop/src/Http/Controllers/Customer/Account/RMAController.php#L408 (disclosure@vulncheck.com)

- https://github.com/bagisto/bagisto/commit/204e43c26705b66ef2ddfb2a9eebb25f5e8f6a2c (disclosure@vulncheck.com)

- https://github.com/bagisto/bagisto/commit/e28db3e8c53a94a99cf153ac338466720acd9004 (disclosure@vulncheck.com)

- https://github.com/bagisto/bagisto/releases/tag/v2.4.5 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/bagisto-before-2.4.5-stored-xss-via-rma-conversation-attachment-upload (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121733; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-121733; retrieved 2026-11-04; source updated 2026-11-03

Revision: b10c74222c4b80cc81f2e6bd011410ea429d292e234ecc2f9440e171bfab260a

Canonical: https://y2.dev/cve/CVE-2026-121733

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- 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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