CVE-2026-63095
Dendrite 0.13.8 Improper Authorization via POST account/3pid/delete Endpoint
- State
- Published
- Severity
- 7.1 High
- Published
- Jul 17, 2026
- Updated
- Jul 28, 2026
- Reserved
- Jul 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N | VulnCheck |
Weaknesses
- CWE-639 Authorization Bypass Through User-Controlled Key
Affected Products
| Product | Versions |
|---|---|
dendritematrix-org |
|
References
- Researcher Disclosuretechnical-descriptionexploit
- https://www.vulncheck.com/advisories/dendrite-improper-authorization-via-post-account-3pid-delete-endpointthird-party-advisory
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