Activepieces: Cross-tenant file download via missing JWT audience check on step-files signed URL
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-345.
Summary
Activepieces is an open source AI workflow automation platform. Prior to 0.83.0, the /v1/step-files/signed download endpoint verified the supplied JWT against the shared signing secret but did not check the token's audience, and combined with a missing null-check on the decoded fileId, this allowed any caller holding any valid Activepieces JWT (including a freshly created user's own access token) to receive a step-file belonging to another tenant. The file returned was whatever PostgreSQL happened to scan first for type = FLOW_STEP_FILE, varying over time as the database changed, so an authenticated user could obtain step-file attachments belonging to other tenants on the same instance; the attacker could not target a specific victim or file, and the access was read-only with no integrity or availability impact. This issue is fixed in version 0.83.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| activepieces | activepieces | before 0.83.0 | 0.83.0 | Patch available | CNA |
- activepieces Vendoractivepieces Affected before 0.83.0 Fixed in 0.83.0 Patch available CNA
Remediation
- Fix · CNA activepieces (activepieces) Fixed in 0.83.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-53536
References
Other 4
- https://github.com/activepieces/activepieces/security/advisories/GHSA-9723-fmff-mc24
- https://github.com/activepieces/activepieces/commit/2cb6148010a6c2a22900f4c8b08d75cc5c921d1c
- https://github.com/activepieces/activepieces/commit/afe852f60e39fcc6273d41e11f0765586b5a0e49
- https://github.com/activepieces/activepieces/releases/tag/0.83.0
More activepieces vulnerabilities
- TI-2026-35860 Activepieces: Cross-tenant data exposure and code injection via the Code piece sandbox cache CVSS 4.0CRITICAL 9.3
- TI-2026-51288 Activepieces: Remote Code Execution via Command Injection in Code Step Name CVSS 4.0HIGH 8.7
- TI-2026-51290 Activepieces: V8 Isolate Sandbox Bypass via importFresh Module Loading CVSS 4.0HIGH 7.6
- TI-2026-38608 Activepieces: Arbitrary file write in git-sync via path traversal and symlinks CVSS 4.0MEDIUM 5.9
- TI-2026-51291 Activepieces: Reflected Cross-Site Scripting in OAuth Redirect Endpoint CVSS 3.1MEDIUM 6.1
- TI-2026-51289 Activepieces: Server-side request forgery in MCP tool validation endpoint CVSS 4.0MEDIUM 5.3
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences