Intermesh GroupOffice up to 6.8.149/25.0.81/26.0.4 WOPI Service server-side request forgery

Summaryinfo

A vulnerability was found in Intermesh GroupOffice up to 6.8.149/25.0.81/26.0.4. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component WOPI Service. Performing a manipulation results in server-side request forgery. This vulnerability is identified as CVE-2026-25511. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Intermesh GroupOffice up to 6.8.149/25.0.81/26.0.4. This affects an unknown function of the component WOPI Service. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.150, 25.0.82, and 26.0.5, an authenticated user within the System Administrator group can trigger a full SSRF via the WOPI service discovery URL, including access to internal hosts/ports. The SSRF response body can be exfiltrated via the built‑in debug system, turning it into a visible SSRF. This also allows full server-side file read. This issue has been patched in versions 6.8.150, 25.0.82, and 26.0.5.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-25511 since 02/02/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation needs additional levels of successful authentication. Neither technical details nor an exploit are publicly available.

Upgrading to version 6.8.150, 25.0.82 or 26.0.5 eliminates this vulnerability. Applying the patch 5ac199dce758e1ce0d1cdb6905df5da3c2af42b3 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• Intermesh

Name

• GroupOffice

Version

• 6.8.149
• 25.0.0
• 25.0.1
• 25.0.2
• 25.0.3
• 25.0.4
• 25.0.5
• 25.0.6
• 25.0.7
• 25.0.8
• 25.0.9
• 25.0.10
• 25.0.11
• 25.0.12
• 25.0.13
• 25.0.14
• 25.0.15
• 25.0.16
• 25.0.17
• 25.0.18
• 25.0.19
• 25.0.20
• 25.0.21
• 25.0.22
• 25.0.23
• 25.0.24
• 25.0.25
• 25.0.26
• 25.0.27
• 25.0.28
• 25.0.29
• 25.0.30
• 25.0.31
• 25.0.32
• 25.0.33
• 25.0.34
• 25.0.35
• 25.0.36
• 25.0.37
• 25.0.38
• 25.0.39
• 25.0.40
• 25.0.41
• 25.0.42
• 25.0.43
• 25.0.44
• 25.0.45
• 25.0.46
• 25.0.47
• 25.0.48
• 25.0.49
• 25.0.50
• 25.0.51
• 25.0.52
• 25.0.53
• 25.0.54
• 25.0.55
• 25.0.56
• 25.0.57
• 25.0.58
• 25.0.59
• 25.0.60
• 25.0.61
• 25.0.62
• 25.0.63
• 25.0.64
• 25.0.65
• 25.0.66
• 25.0.67
• 25.0.68
• 25.0.69
• 25.0.70
• 25.0.71
• 25.0.72
• 25.0.73
• 25.0.74
• 25.0.75
• 25.0.76
• 25.0.77
• 25.0.78
• 25.0.79
• 25.0.80
• 25.0.81
• 26.0.0
• 26.0.1
• 26.0.2
• 26.0.3
• 26.0.4

License

• open-source

Website

• Product: https://github.com/Intermesh/groupoffice/

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Entryinfo

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