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CVE-2026-70617— Spacebar Server Missing Authorization via Group DM Recipient Endpoint

CVSS 8.1 · High

Possible ATT&CK Techniques 1AI

T1528 · Steal Application Access Token
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I. Basic Information for CVE-2026-70617

Vulnerability Information
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Vulnerability Title
Spacebar Server Missing Authorization via Group DM Recipient Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Spacebar Server before commit dcfd910 contains a missing authorization vulnerability that allows any authenticated attacker to add themselves to arbitrary group DM channels by sending a PUT request to the channels recipient endpoint without membership verification. Attackers can exploit the unguarded PUT /channels/{channel_id}/recipients/{user_id} handler to join private group DMs, read complete message history, post messages as a participant, and force-add third-party users without their consent.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
Spacebar ServerSpacebar Server 0 ~ dcfd91035e3da42abf5f32d8d86a35219225b3d4 -

II. Public POCs for CVE-2026-70617

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 7654 chars
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III. Intelligence Information for CVE-2026-70617

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Patches & Fixes for CVE-2026-70617 (1)

Vendor Advisories for CVE-2026-70617 (2)

IV. Related Vulnerabilities

Same product: Spacebar Server
Same vendor: Spacebar Server
Same weakness: CWE-862

V. Comments for CVE-2026-70617

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