An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. (CVE-2026-47087)
Description
Cyrus IMAP through version 3.12.2 contains a vulnerability in the URLAUTH feature where revoked authorizer access is not honored. URLs minted while the authorizer had access remain valid even after the access is revoked, potentially allowing continued unauthorized access. The vulnerability has a medium severity with a CVSS score of 3.5.
CVSS v3.1
Score 3.5low
Affected software
pkg:deb/ubuntu/cyrus-imapd?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/cyrus-imapd?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/cyrus-imapd?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/cyrus-imapd?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/cyrus-imapd?arch=source&distro=stonkingpkg:deb/ubuntu/cyrus-imapd?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-47087 affects cyrus-imapd in Cyrus IMAP versions through 3.12.2. The issue lies in the URLAUTH mechanism, which does not properly invalidate URLs when the authorizer's access is revoked. As a result, a URLAUTH URL created during a time when the authorizer had access continues to function despite the revocation, potentially allowing unauthorized access to resources.
Potential Impact
The vulnerability allows continued use of URLAUTH URLs after the authorizer's access has been revoked, which may lead to limited unauthorized access to IMAP resources. The CVSS score of 3.5 indicates a medium impact primarily on confidentiality with no impact on integrity or availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor vendor communications for updates and consider restricting URLAUTH usage or revoking URLs manually if possible until a fix is available.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-47087
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f64c2cdf04f656665858
Added to database: 10/17/2026, 22:27:24 UTC
Last enriched: 10/18/2026, 01:23:24 UTC
Last updated: 10/18/2026, 01:23:24 UTC
Views: 3
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