Mail disclosure via stale URLAUTH authorization
Published Jul 16, 2026 · Updated Jul 16, 2026
Authorization failure in Cyrus IMAP before 3.12.3 allows remote authenticated users to read mail through a previously issued URLAUTH URL. The URLAUTH redemption path accepts an already minted URL without rechecking whether its authorizer still has access to the referenced mailbox. Exploitation requires possession of a URL minted before access was revoked; the URL continues to expose the delegated mail content afterward.
Summary
What happened
Authorization failure in Cyrus IMAP before 3.12.3 allows remote authenticated users to read mail through a previously issued URLAUTH URL. The URLAUTH redemption path accepts an already minted URL without rechecking whether its authorizer still has access to the referenced mailbox. Exploitation requires possession of a URL minted before access was revoked; the URL continues to expose the delegated mail content afterward.
The record
- CVE
- CVE-2026-47087
- Published
- Jul 16, 2026
- Updated
- Jul 16, 2026
- Vendor
- Project Cyrus
- Product
- Cyrus IMAP
- Classifications
- CWE-672, T1550.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 16, 2026CVE publishedPublication date reported by the CVE source.
- Jul 16, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.12.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
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Your stack
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