Incorrect Implementation of Authentication Algorithm Affecting dovecot package, versions [2.3.13,2.4.5)
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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- published24 Sept 2026
- disclosed28 Aug 2026
- creditUnknown
Introduced: 28 Aug 2026
CVE-2026-73208 (opens in a new tab)How to fix?
Upgrade dovecot to version 2.4.5 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Implementation of Authentication Algorithm in the OAuth2 token validation process. An attacker can gain unauthorized access by presenting a token intended for a different audience when the scope claim is missing, causing the system to incorrectly use the audience claim for authorization checks. This may allow access even if the token does not grant the necessary permissions.
Workaround
This vulnerability can be mitigated by ensuring the identity provider issues a scope claim for all tokens and verifying that configured scope names do not match audience values from the identity provider. A restart of the service may be required for configuration changes to take effect.