VulnerabilityPublished 4 Feb 2026Updated 5 Feb 2026

CVE-2026-25511: Intermesh groupoffice · Server-Side Request Forgery (SSRF)

Affects Intermesh groupofficeSource CVE Database V5

Not known to be exploited · CVSS 8.2 High · fixed in 26.0.5 : patch Intermesh groupoffice soon.

Data as of 26 Oct 2026, 11:42 UTC

CVSS 4.0 base score

8.2High

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

EPSS: 0.4% chance of exploitation in 30 days – higher than 38% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 26.0.5, 25.0.82, 6.8.150

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: High
User Interaction: None
Vulnerable system confidentiality: High
Vulnerable system integrity: None
Vulnerable system availability: None
Subsequent system confidentiality: High
Subsequent system integrity: None
Subsequent system availability: None

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

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, 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: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: High: The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: High: There is a total loss of confidentiality, resulting in all information within the Vulnerable System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
Vulnerable system integrity: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: High: There is a total loss of confidentiality, resulting in all resources within the Subsequent System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 4 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 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 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.

What to do

Upgrade groupoffice and intermesh/groupoffice to 26.0.5, 25.0.82 or 6.8.150.

Affected software

Product	Affected	Fixed in
Intermeshgroupoffice	Affected <26.0.5	Fixed in 26.0.5
Intermeshgroupoffice	Affected <25.0.82	Fixed in 25.0.82
Intermeshgroupoffice	Affected <6.8.150	Fixed in 6.8.150
GitHubintermesh/groupoffice`pkg:github/intermesh/groupoffice`Other threats	Affected <6.8.150 <25.0.82 <26.0.5	Fixed in 6.8.150 25.0.82 26.0.5

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

European organizations should immediately verify their Group-Office versions and upgrade to 6.8.150, 25.0.82, or 26.0.5 or later to remediate this vulnerability. Beyond patching, organizations should enforce strict access controls and monitoring on System Administrator accounts to prevent unauthorized access. Implement multi-factor authentication (MFA) for all administrative users to reduce the risk of credential compromise. Network segmentation should be employed to limit the Group-Office server's ability to access sensitive internal resources, minimizing the impact of SSRF exploitation. Disable or restrict the built-in debug system or ensure it is not accessible in production environments to prevent exfiltration of SSRF responses. Conduct regular audits of server logs for unusual internal requests originating from Group-Office. Finally, consider deploying web application firewalls (WAFs) with rules to detect and block SSRF patterns targeting internal IP ranges.

Description

CVE-2026-25511 is a high-severity Server-Side Request Forgery (SSRF) vulnerability in Intermesh's Group-Office product affecting versions prior to 6.8.150, 25.0.82, and 26.0.5. An authenticated user with System Administrator privileges can exploit the WOPI service discovery URL to perform SSRF attacks, including accessing internal hosts and ports. The vulnerability allows exfiltration of SSRF response bodies via the built-in debug system, effectively making the SSRF visible and enabling full server-side file read. No user interaction is required beyond authentication, and the vulnerability does not require additional privileges beyond System Administrator access.

Impact

For European organizations, this vulnerability poses significant risks, particularly for enterprises relying on Group-Office for CRM and collaboration. Exploitation can lead to unauthorized internal network scanning and access, potentially exposing sensitive internal services and data repositories. The ability to read server-side files can result in leakage of confidential information, including credentials, configuration files, or personal data protected under GDPR. This could lead to regulatory penalties, reputational damage, and operational disruptions. Since the vulnerability requires System Administrator authentication, insider threats or compromised administrator accounts are primary risk vectors. However, given that many organizations use Group-Office in critical business functions, the impact of a successful exploit could be severe, including lateral movement within networks and data exfiltration. The high CVSS score reflects the critical nature of confidentiality breaches and the ease of exploitation once authenticated.

CWE-918Server-Side Request Forgery (SSRF) (opens in a new tab)
Base weaknessCWE Top 25 (2025): #22OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
OWASP Cheat Sheets
Server Side Request Forgery Prevention (opens in a new tab)
Unvalidated Redirects and Forwards (opens in a new tab)
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V12.6.1 (opens in a new tab)
V5.2.6 (opens in a new tab)
Attack patterns
Server Side Request Forgery (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Feb 2026, 07:27 UTC

WeaknessesCWE-918

Technical details

References

Community reviews

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