VulnerabilityPublished 10 Aug 2026

CVE-2026-57279: Cybozu Garoon · Cross-site Scripting (XSS)

Affects Cybozu GaroonSource CVE Database V5

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Not known to be exploited · CVSS 6.8 Medium.

Data as of 8 Nov 2026, 23:24 UTC

CVSS 3.0 base score

6.8Medium

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

EPSS: 0.3% chance of exploitation in 30 days – higher than 24% 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:C/C:N/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Scope: Changed
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: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
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 10 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 8 Nov 2026.

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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity 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.

ghsa-52jw-w52q-hj2v

What to do

Affected software

Product	Affected	Fixed in
Cybozu, IncCybozu Garoon	Affected >=6.17.0 <=6.17.1	Fixed in–

AI-suggested

Until a fix is available, users should exercise caution with untrusted content and links within the application. Monitor official Cybozu communications for updates.

Description

Cybozu Garoon version 6.17.0 contains a cross-site scripting (XSS) vulnerability that allows execution of arbitrary scripts in the browser of authenticated users. This vulnerability has a medium severity rating with a CVSS score of 6.8. Exploitation requires user interaction and privileges, and no official patch or remediation guidance has been provided yet.

Impact

If exploited, an attacker can execute arbitrary scripts in the web browser of an authenticated user, potentially leading to unauthorized actions performed with the user's privileges. There is no indication of impact on confidentiality or availability. No known exploits are reported in the wild.

Summary

CVE-2026-57279 is a cross-site scripting vulnerability in Cybozu Garoon 6.17.0. Successful exploitation enables an attacker to execute arbitrary scripts in the context of a logged-in user's browser. The vulnerability has a CVSS 3.0 base score of 6.8, indicating medium severity, with attack vector network, low attack complexity, requiring privileges and user interaction, and causing impact on integrity but not confidentiality or availability.

References

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