CVE-2026-109848
Deferred Deferred - Pending Action

Authorization Bypass in GROWI via Tag and Page Update APIs

Publication date: 2026-10-28

Last updated on: 2026-10-28

Assigner: JPCERT/CC

Description
GROWI contains an authorization bypass vulnerability in its tag update API and the page update API due to improper use of a user-controlled key. By exploiting this vulnerability, an attacker who can log in to the product may obtain the contents of pages without the required read permission and save them to pages that the attacker can edit.

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Meta Information

Published
2026-10-28
Last Modified
2026-10-28
Generated
2026-10-28
AI Q&A
2026-10-28
EPSS Evaluated
N/A
NVD
CVE-2026-109848
EUVD
EUVD-2026-111556

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
GROWI, Inc. GROWI v4.5.5

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

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Executive Summary

GROWI has an authorization bypass flaw in its tag update and page update APIs. This happens because the system improperly uses a user-controlled key, allowing attackers with login access to read pages they shouldn't and save content to pages they can edit.

Impact Analysis

An attacker could access sensitive page contents without permission and modify pages they control. This may lead to data leaks, unauthorized changes, or further system compromise depending on the affected pages.

Mitigation Strategies

Apply the latest security patches or updates provided by GROWI to fix the authorization bypass issue in the tag and page update APIs. Ensure proper access controls are enforced to prevent unauthorized read or write operations.

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