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Critical, CVSS 9.9amended

Paperclip: Cross-tenant agent API key IDOR in /agents/:id/keys routes allows full victim-company compromise

GHSA-3xx2-mqjm-hg9x

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@paperclipai/server 2026.416.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
9.9 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary The GET, POST, and DELETE handlers under /agents/:id/keys in the Paperclip control-plane API only call assertBoard(req), which verifies that the caller has a board-type session but does not verify that the caller has access to the company owning the target agent. A board user whose membership is limited to Company A can therefore list, create, or revoke agent API keys for any agent in Company B by supplying the victim agent's UUID in the URL path. The POST handler returns the newly-minted token in cleartext, which authenticates subsequent requests as {type:"agent", companyId:<CompanyB}, giving the attacker full agent-level access inside the victim tenant — a complete cross-tenant compromise. Details The three vulnerable routes are defined in server/src/routes/agents.ts:2050-2087: assertBoard in server/src/routes/authz.ts:4-8 is intentionally narrow: It does not consult req.actor.companyIds or req.actor.isInstanceAdmin. Company-scoping is handled by a separate helper,…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-3xx2-mqjm-hg9x

  2. Revision 2 · amended ·

    Amended from osv record GHSA-3xx2-mqjm-hg9x

  3. Revision 1 · created ·

    Published from ghsa record GHSA-3xx2-mqjm-hg9x

Agent brief

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# Patch Next advisory brief: GHSA-3xx2-mqjm-hg9x

Advisory: Paperclip: Cross-tenant agent API key IDOR in `/agents/:id/keys` routes allows full victim-company compromise
IDs: GHSA-3xx2-mqjm-hg9x
Record: https://patchnext.com/advisories/ghsa-3xx2-mqjm-hg9x (revision 3, source checked 26 Oct 2026, 12:48 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @paperclipai/server 2026.416.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @paperclipai/server: affected < 2026.416.0; fixed in 2026.416.0

## Suggested inspection (read-only)
- `npm ls @paperclipai/server --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @paperclipai/server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-3xx2-mqjm-hg9x (GitHub-reviewed advisory GHSA-3xx2-mqjm-hg9x lists affected ranges: npm @paperclipai/server >=0 <2026.416.0)
- Verified: https://osv.dev/vulnerability/GHSA-3xx2-mqjm-hg9x (OSV record GHSA-3xx2-mqjm-hg9x lists affected ranges: npm @paperclipai/server >=0 <2026.416.0 (fixed))

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