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TI-2026-30884 Aliases CVE-2026-42604

Actual has an OpenID `client_secret` Disclosure via Broken Authorization Guard in `/openid/config`

Priority LOW 33CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

Actual is a local-first personal finance tool. The `POST /openid/config` endpoint in Actual Budget's sync-server versions <= 26.4.0 exposes the full OpenID Connect configuration—including the OAuth2 `client_secret`—to any caller who knows the bootstrap password. The endpoint also lacks authentication and rate limiting, making the bootstrap password brute-forceable. Version 26.5.0 fixes the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.004 34th percentileScored 2026-11-07
Fix Fixed actual (actualbudget): 26.5.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
actualbudgetactualbefore 26.5.026.5.0Patch availableCNA
  • actual Vendoractualbudget Affected before 26.5.0 Fixed in 26.5.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:actualbudget:actual:*:*:*:*:*:*:*:*——actualbudget
  • cpe:2.3:a:actualbudget:actual:*:*:*:*:*:*:*:* Versions — — ·actualbudget

Remediation

  • Fix · CNA actual (actualbudget) Fixed in 26.5.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42604

References

Other 2

  • TI-2026-21972 ActualBudget server is Missing Authentication for SimpleFIN and Pluggy AI bank sync endpoints CVSS 4.0CRITICAL 9.2
  • TI-2026-25729 Actual has Privilege Escalation via 'change-password' Endpoint on OpenID-Migrated Servers CVSS 3.1HIGH 8.8
  • TI-2026-36430 Actual: Disabled OpenID users keep access through existing session tokens CVSS 3.1HIGH 8.3
  • TI-2026-36833 Actual: Shared users can perform owner-only file management actions CVSS 4.0HIGH 7.2
  • TI-2026-22020 ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode CVSS 4.0MEDIUM 5.7
  • TI-2026-41382 Information disclosure in actualbudget actual CVSS 4.0HIGH 7.1
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences