CVE-2026-102631 Affecting authd package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2610-AUTHD-21219561
- published18 Oct 2026
- disclosed15 Oct 2026
Introduced: 15 Oct 2026
NewCVE-2026-102631 (opens in a new tab)How to fix?
There is no fixed version for Ubuntu:26.10 authd.
NVD Description
Note: Versions mentioned in the description apply only to the upstream authd package and not the authd package as distributed by Ubuntu.
See How to fix? for Ubuntu:26.10 relevant fixed versions and status.
In authd before 0.7.1, the user identity matching in UpdateUser (internal/users/manager.go) resolves an incoming login by the broker-scoped provider ID, but falls back to matching the username when the provider ID does not belong to any known user, and does not reject a conflicting non-empty provider ID. If an identity provider reassigns an email address, which authd uses as the username, to a new account, the new account inherits the previous user's local UID and home directory on its next login. This allows the new user to access and modify files belonging to the previous user, including credentials such as SSH keys and cloud API tokens, and silently rebinds the local account record to the new identity. As a mitigation, administrators should lock or delete the previous user's local authd account when the corresponding IdP account is removed.