CVE-2026-34838
CRITICALGroup-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`
Title source: cnaExploitation Summary
EIP tracks 2 public exploits for CVE-2026-34838. PoCs published by adminlove520, bamuwe.
AI-analyzed exploit summary This repository contains a functional exploit for CVE-2026-34838, a PHP deserialization vulnerability in Group-Office. The exploit chains a GuzzleHttp CookieJar gadget to achieve arbitrary file write and RCE via a crafted serialized payload.
Description
Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.156, 25.0.90, and 26.0.12, a vulnerability in the AbstractSettingsCollection model leads to insecure deserialization when these settings are loaded. By injecting a serialized FileCookieJar object into a setting string, an authenticated attacker can achieve Arbitrary File Write, leading directly to Remote Code Execution (RCE) on the server. This issue has been patched in versions 6.8.156, 25.0.90, and 26.0.12.
Exploits (2)
This repository contains a functional exploit for CVE-2026-34838, a PHP deserialization vulnerability in Group-Office. The exploit chains a GuzzleHttp CookieJar gadget to achieve arbitrary file write and RCE via a crafted serialized payload.
This repository contains a functional exploit for CVE-2026-34838, demonstrating an RCE vulnerability in Group-Office via PHP deserialization. The PoC constructs a malicious gadget chain using GuzzleHttp's FileCookieJar to achieve arbitrary file write and subsequent code execution.
References (4)
Scores
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H