Unauthenticated attachment disclosure via skipped permission check
Published Aug 25, 2026 · Updated Aug 25, 2026
Missing authorization in GROWI before 8.0.2 allows remote attackers to retrieve private attachments by supplying an attachment identifier. The retrieveAttachmentFromIdParam handler checks page-viewer permission only when req.user is non-null, so sessionless requests to /attachment/:id or /download/:id skip authorization and return the file. An attachment identifier is required, but revoked users or other recipients of a previously exposed identifier can read the associated private file without authentication.
Summary
What happened
Missing authorization in GROWI before 8.0.2 allows remote attackers to retrieve private attachments by supplying an attachment identifier. The retrieveAttachmentFromIdParam handler checks page-viewer permission only when req.user is non-null, so sessionless requests to /attachment/:id or /download/:id skip authorization and return the file. An attachment identifier is required, but revoked users or other recipients of a previously exposed identifier can read the associated private file without authentication.
The record
- CVE
- CVE-2026-80191
- Published
- Aug 25, 2026
- Updated
- Aug 25, 2026
- Vendor
- WESEEK, Inc.
- Product
- GROWI
- Classifications
- CWE-862, T1213
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 25, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 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 <8.0.2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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