Garoon
CVE-2026-20711
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 6.1 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: Required. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability to reset arbitrary users’ passwords. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Cybozu Garoon versions 5.0.0 through 6.0.3 contain a cross-site scripting vulnerability in the email function that enables attackers to reset arbitrary user passwords by crafting malicious email content. The attack requires user interaction to trigger and can affect confidentiality and integrity across security boundaries. No patch is currently available for this vulnerability.
Earlier versions of this analysis (1)
Cross-site scripting vulnerability exists in E-mail function of Cybozu Garoon 5.0.0 to 6.0.3, which may allow an attacker to reset arbitrary users’ passwords. [CVSS 6.1 MEDIUM]
RemediationAI
Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-79 (Cross-site Scripting (XSS)). Affects the E-mail component of Garoon. Cross-site scripting vulnerability exists in E-mail function of Cybozu Garoon 5.0.0 to 6.0.3, which may allow an attacker to reset arbitrary users’ passwords.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionCVE.org
Cross-site scripting vulnerability exists in E-mail function of Cybozu Garoon 5.0.0 to 6.0.3, which may allow an attacker to reset arbitrary users’ passwords.
Executive ViewAI
CVE-2026-20711 presents moderate security risk, a cross-site scripting vulnerability rated CVSS 6.1. Attackers could inject scripts to steal sessions or perform actions as authenticated users. Organizations should apply vendor updates when available and monitor for exploitation.
Apply vendor patch. If patching is delayed: implement CSP headers, enable HttpOnly cookies, deploy WAF XSS rules.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)CVE.org
The CGI component in Cybozu Garoon 3.1.0 through 3.7 SP3 allows remote attackers to execute arbitrary commands via unspe
Cybozu Garoon before 4.2.2 allows remote attackers to bypass login authentication via vectors related to API use. Rated
Cybozu Garoon 4.2.4 to 4.10.1 allow remote attackers to obtain the users' credential information via the authentication
SQL injection vulnerability in the Cybozu Garoon 3.0.0 to 4.2.2 allows remote authenticated attackers to execute arbitra
Cross-site scripting vulnerability in Cybozu Garoon 5.0.0 to 5.15.2 allows a remote authenticated attacker with an admin
SQL injection vulnerability in Cybozu Garoon before 4.2.2. Rated high severity (CVSS 8.8), this vulnerability is remotel
Cybozu Garoon 3.0.0 to 4.2.2 allow remote attackers to obtain CSRF tokens via unspecified vectors. Rated high severity (
SQL injection vulnerability in the Notifications application in the Cybozu Garoon 3.5.0 to 4.6.2 allows remote authentic
SQL injection vulnerability in the Cybozu Garoon 3.5.0 to 4.2.6 allows remote authenticated attackers to execute arbitra
Cybozu Garoon 4.0.0 to 4.6.3 allows authenticated attackers to alter the information with privileges invoking the instal
Cybozu Garoon 3.x through 3.7.5 and 4.x through 4.0.3 allows remote authenticated users to execute arbitrary PHP code vi
The RSS Reader component in Cybozu Garoon 3.x through 3.7.5 and 4.x through 4.0.3 allows remote authenticated users to e
GitHub PoC
Exploit-DB