# CVE-2026-121945: CoopCycle coopcycle-web before 6.20.1 IDOR via Incident Resource and Action Endpoint

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

CoopCycle coopcycle-web before 6.20.1 contains a broken access control vulnerability that allows any courier to read and modify every incident because Incident operations only check ROLE_COURIER. Attackers can enumerate sequential incident ids and use PUT /api/incidents/{id}/action to re-price, cancel or reschedule other stores' orders and tasks.

## 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/coopcycle/coopcycle-web/commit/d997393d128afa1febe34e8f295b9511c12d19a0

## Affected products and versions

- CoopCycle / coopcycle-web (coopcycle/coopcycle-web): ≥ 0; < 6.20.1 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.2 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.6 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-639

## Exploit evidence

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

## References

- https://github.com/coopcycle/coopcycle-web/issues/5390 (CNA: VulnCheck; issue-tracking)

- https://hackmd.io/@hieund/coopcycle-incident-courier-cross-tenant-bola (CNA: VulnCheck; third-party-advisory)

- https://github.com/coopcycle/coopcycle-web/commit/d997393d128afa1febe34e8f295b9511c12d19a0 (CNA: VulnCheck; patch)

- https://github.com/coopcycle/coopcycle-web/blob/v6.19.1/src/Entity/Incident/Incident.php#L43-L71 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/coopcycle-coopcycle-web-before-6.20.1-idor-via-incident-resource-and-action-endpoint (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121945; retrieved 2026-11-04; source updated 2026-11-04

Revision: f1dd8ac3c3a3f097c9101a1cd5c4393125776deb3c8ea61d307a8edc699c06af

Canonical: https://y2.dev/cve/CVE-2026-121945

## 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.

Collected public records only. Check source status for coverage and freshness.