CVE-2026-63095Public exploitNetwork attack vector

Account takeover via unscoped identifier deletion

Published Jul 17, 2026 · Updated Jul 17, 2026

Improper authorization in Dendrite 0.13.8 and earlier allows remote authenticated users to delete other users' email or MSISDN bindings. Forget3PID discards the authenticated device identity and deletes the database row selected only by the attacker-controlled address and medium. Any local account can remove a victim's recovery binding and rebind that address through an identity server to hijack password reset.

CVSS severity7.1
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Dendrite 0.13.8 and earlier allows remote authenticated users to delete other users' email or MSISDN bindings. Forget3PID discards the authenticated device identity and deletes the database row selected only by the attacker-controlled address and medium. Any local account can remove a victim's recovery binding and rebind that address through an identity server to hijack password reset.

The record

CVE
CVE-2026-63095
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Matrix.org Foundation
Product
Dendrite
Classifications
CWE-639, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.13.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Matrix.org Foundation · Dendriteversion=0 <=0.13.8

Published CVSS scores

7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1098Account Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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