EUVD-2026-36543Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable, no-auth endpoint; S:C because leaked client_secret directly impacts the external identity provider; A:N as no availability impact is described.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Unauthenticated access to the POST /openid/config endpoint in Actual Budget sync-server versions <= 26.4.0 exposes the full OpenID Connect configuration-including the OAuth2 client_secret-to any caller who can supply the bootstrap password. Because the endpoint enforces no rate limiting, the bootstrap password itself is brute-forceable, compounding the exposure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The `POST /openid/config` endpoint must be network-reachable from the attacker. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.9 (Medium) with vector AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N reflects network-accessible exploitation requiring no privileges or user interaction, though AT:P acknowledges that the bootstrap password represents a real (if weak) attack prerequisite given the absence of rate limiting. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker scans for internet-facing Actual Budget sync-server instances and sends automated POST requests to `/openid/config` with sequentially guessed bootstrap passwords; the absence of rate limiting permits thousands of attempts per second. Once the correct password is identified, the attacker retrieves the complete OIDC configuration including the OAuth2 `client_secret` and uses it to impersonate the Actual Budget application in OAuth2 flows against the configured identity provider, potentially obtaining access tokens for user accounts. |
| Remediation | Upgrade Actual Budget sync-server to version 26.5.0, which resolves the issue per the vendor security advisory at https://github.com/actualbudget/actual/security/advisories/GHSA-49v6-pqjq-xw55 and the release notes at https://actualbudget.org/blog/release-26.5.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
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