CVE-2026-22881VulnerabilityPublished 2 Feb 2026

CVE-2026-22881: Cybozu Garoon · Cross-site scripting (XSS)

Affects Cybozu GaroonSource CVE Database V5

Not known to be exploited · CVSS 5.7 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.0 base score

5.7Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 16% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 2 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Cybozu, Inc.Cybozu Garoon	Affected =5.15.0 to 6.0.3	Fixed in–

AI-suggested

Organizations should immediately assess their Cybozu Garoon versions and plan to upgrade to a patched version once released by Cybozu, Inc. In the interim, applying strict input validation and sanitization on the Message function can reduce the risk of XSS payloads being processed. Implementing Content Security Policy (CSP) headers can mitigate the impact of injected scripts by restricting script execution sources. Monitoring and alerting on unusual password reset activities or multiple failed login attempts can help detect exploitation attempts early. User education to recognize phishing or suspicious messages is also beneficial given the user interaction requirement. Restricting access to the Garoon platform to trusted networks and enforcing multi-factor authentication (MFA) can further reduce the risk of account compromise. Regular security audits and penetration testing focusing on web application vulnerabilities should be conducted to identify and remediate similar issues proactively.

Description

CVE-2026-22881 is a medium-severity cross-site scripting (XSS) vulnerability in the Message function of Cybozu Garoon versions 5.15.0 to 6.0.3. Exploitation can allow an attacker with limited privileges and requiring user interaction to execute scripts that may reset arbitrary users’ passwords. The vulnerability does not impact confidentiality directly but threatens integrity by enabling unauthorized password resets, potentially leading to account takeover. No known exploits are currently in the wild. European organizations using affected versions of Cybozu Garoon, particularly in countries with significant adoption of this collaboration platform, should prioritize patching or mitigation. The vulnerability requires network access and some privileges, making exploitation feasible but not trivial.

Impact

For European organizations, this vulnerability poses a risk primarily to the integrity of user accounts within Cybozu Garoon deployments. Successful exploitation could lead to unauthorized password resets, enabling attackers to take over user accounts, potentially accessing sensitive internal communications, schedules, and documents. This could facilitate further lateral movement within an organization’s network or data exfiltration. While confidentiality is not directly compromised by the XSS itself, the resulting account takeover can lead to significant data breaches. The requirement for some privileges and user interaction limits mass exploitation but does not eliminate targeted attacks, especially against high-value users such as administrators or executives. Organizations in Europe that use Cybozu Garoon for critical business processes may face operational disruptions and reputational damage if this vulnerability is exploited. Additionally, regulatory compliance risks arise if personal or sensitive data is exposed due to compromised accounts, potentially triggering GDPR-related penalties.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 9 Feb 2026, 10:59 UTC

Technical details

References

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