CVE-2026-62860

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CVE-2026-62860

Summary: Picsou vulnerable to login timing attack

Details: Picsou is a self-hosted personal finance dashboard. In the affected login implementation, the `/api/auth/login` endpoint reveals whether a username exists through a timing discrepancy. In `backend/src/main/java/com/picsou/controller/AuthController.java`, `AuthController.login()` throws `BadCredentialsException` immediately for an unknown username, before `passwordEncoder.matches(...)`, whereas an existing username with an incorrect password incurs the `bcrypt` comparison cost. Both cases return the same generic `HTTP 401` response, but repeated latency measurements disclose valid usernames without credentials. Login rate limiting, a small user population, and deployments inaccessible from outside the local network limit practical exposure; the weakness does not itself read or modify account data, though enumerated usernames can assist credential stuffing or brute-force attacks. This issue is fixed in repository release 1.0.8.

References: https://github.com/Cloeille/picsou-finance/releases/tag/1.0.8, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62860.json, https://github.com/Cloeille/picsou-finance/security/advisories/GHSA-ww5m-pxgq-8qq6, https://nvd.nist.gov/vuln/detail/CVE-2026-62860, https://github.com/Cloeille/picsou-finance/commit/877ac0f7c651612e15f0dbac5de8e96d66bbcf59