VulnerabilityPublished 27 Nov 2025Updated 28 Nov 2025

CVE-2025-30186: Open-Xchange OX App Suite · Cross-site Scripting

Affects Open-Xchange OX App SuiteSource CVE Database V5

Not known to be exploited · CVSS 5.4 Medium.

Data as of 26 Oct 2026, 09:15 UTC

CVSS 3.1 base score

5.4Medium

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: Low
Integrity: Low
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: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
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: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on 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 27 Nov 2025
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 26 Oct 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.
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
Open-Xchange GmbH OX App Suite	Affected =0	Fixed in–

AI-suggested

European organizations should prioritize the following mitigation steps: 1) Immediately identify and inventory all deployments of OX App Suite within their environment. 2) Apply the vendor-provided patches and updates as soon as they become available to remediate the vulnerability. 3) Implement strict input validation and content sanitization policies on file uploads and web content where possible, to reduce the risk of malicious content execution. 4) Educate users about the risks of clicking on suspicious links, especially those received via email or messaging platforms, to reduce the likelihood of user interaction exploitation. 5) Employ web application firewalls (WAFs) with rules tuned to detect and block XSS attack patterns targeting OX App Suite. 6) Monitor logs and network traffic for unusual activity indicative of exploitation attempts, such as anomalous script execution or data exfiltration. 7) Consider deploying Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts within the application context. 8) Regularly review and update incident response plans to include scenarios involving XSS exploitation in collaboration platforms.

Description

Malicious content uploaded as file can be used to execute script code when following attacker-controlled links. Unintended actions can be executed in the context of the users account, including exfiltration of sensitive information. Please deploy the provided updates and patch releases. No publicly available exploits are known

Impact

For European organizations, the impact of this vulnerability can be significant, especially for enterprises and institutions relying on OX App Suite for email, calendaring, and collaboration. Successful exploitation could lead to unauthorized access to sensitive corporate communications and personal data, potentially violating GDPR requirements around data confidentiality and breach notification. The ability to execute scripts in user sessions can facilitate phishing, session hijacking, and lateral movement within networks. Although the attack requires user interaction, targeted spear-phishing campaigns could exploit this vulnerability to compromise high-value accounts. The medium severity rating suggests moderate risk, but the potential for data leakage and unauthorized actions could have reputational and regulatory consequences. Organizations in sectors such as finance, government, healthcare, and critical infrastructure in Europe, where data protection is paramount, may face elevated risks if this vulnerability is exploited.

References

documentation.open-xchange.com/appsuite/security/advisories/csaf/2025/oxas-adv-2025-0003.json (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Dec 2025, 11:15 UTC

Technical details

References

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