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CVE-2026-63095— Dendrite 0.13.8 Improper Authorization via POST account/3pid/delete Endpoint

CVSS 6.5 · Medium EPSS 0.18% · P8

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
matrix-orgdendrite≤ 0.13.8affected
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I. Basic Information for CVE-2026-63095

Vulnerability Information
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Vulnerability Title
Dendrite 0.13.8 Improper Authorization via POST account/3pid/delete Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Dendrite through 0.13.8 contains an improper authorization vulnerability in the Matrix Client-Server API that allows any authenticated local user to delete third-party identifier bindings belonging to other users by submitting an arbitrary address and medium to the account deletion endpoint without ownership verification. Attackers can exploit the unverified Forget3PID handler to remove a victim's email or MSISDN binding and subsequently rebind the address through an identity server to hijack the victim's password reset flow.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Matrix Dendrite 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matrix Dendrite是Matrix基金会开源的一个用 Go 编写的第二代 Matrix 家庭服务器。 Matrix Dendrite 0.13.8及之前版本存在授权问题漏洞，该漏洞源于Matrix Client-Server API中授权不当，允许任何经过身份验证的本地用户通过向账户删除端点提交任意地址和介质而无需所有权验证，删除其他用户的第三方标识符绑定。攻击者可以利用未验证的Forget3PID处理程序删除受害者的电子邮件或MSISDN绑定，随后通过身份服务器重新绑定该地址，从而劫持受害者的
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
matrix-orgdendrite 0 ~ 0.13.8 -

II. Public POCs for CVE-2026-63095

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III. Intelligence Information for CVE-2026-63095

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Vendor Advisories for CVE-2026-63095 (1)

Security Blog Posts for CVE-2026-63095 (1)

Same Patch Batch · matrix-org · 2026-07-17 · 3 CVEs total

CVE-2026-630965.8 MEDIUMDendrite 0.13.8 SSRF via Unauthenticated Legacy Media Download Endpoint
CVE-2026-630974.3 MEDIUMDendrite 0.13.8 syncapi /context Endpoint Post-Leave State Exposure

IV. Related Vulnerabilities

Same product: dendrite
Same vendor: matrix-org
Same weakness: CWE-639

V. Comments for CVE-2026-63095

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