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8 vulnerabilities found for dendrite by matrix-org
CVE-2026-63097 (GCVE-0-2026-63097)
Vulnerability from nvd – Published: 2026-07-17 15:32 – Updated: 2026-07-17 15:32 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
Dendrite 0.13.8 syncapi /context Endpoint Post-Leave State Exposure
Summary
Dendrite through 0.13.8 contains an improper access control vulnerability in the syncapi /context endpoint (syncapi/routing/context.go) that allows authenticated local users to access post-leave room state events by exploiting a flawed membership check that evaluates only the RoomExists field while ignoring IsInRoom, HasBeenInRoom, and Membership fields. Attackers who have left a room can call the rooms context API endpoint for a previously permitted event and receive unfiltered current room state that the /messages and /sync endpoints correctly withhold.
Severity
4.3 (Medium)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/geo-chen/oss/blob/main/dendrit… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/dendrite-syn… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| matrix-org | dendrite |
Affected:
0 , ≤ 0.13.8
(semver)
|
Date Public
2026-07-16 00:00
Credits
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CVE-2026-63096 (GCVE-0-2026-63096)
Vulnerability from nvd – Published: 2026-07-17 15:30 – Updated: 2026-07-17 18:05 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
Dendrite 0.13.8 SSRF via Unauthenticated Legacy Media Download Endpoint
Summary
Dendrite through 0.13.8 contains a server-side request forgery vulnerability that allows unauthenticated attackers to cause the server to open outbound TLS connections to arbitrary hosts and ports by supplying an unvalidated serverName parameter to the legacy media download endpoint. Attackers can exploit distinguishable error response classes and leaked internal IP addresses in error messages to perform blind port scanning and enumerate internal network topology.
Severity
5.8 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/geo-chen/oss/blob/main/dendrit… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/dendrite-ssr… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| matrix-org | dendrite |
Affected:
0 , ≤ 0.13.8
(semver)
|
Date Public
2026-07-16 00:00
Credits
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CVE-2026-63095 (GCVE-0-2026-63095)
Vulnerability from nvd – Published: 2026-07-17 15:27 – Updated: 2026-07-17 16:00 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
Dendrite 0.13.8 Improper Authorization via POST account/3pid/delete Endpoint
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/geo-chen/oss/blob/main/dendrit… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/dendrite-imp… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| matrix-org | dendrite |
Affected:
0 , ≤ 0.13.8
(semver)
|
Date Public
2026-07-16 00:00
Credits
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CVE-2022-39200 (GCVE-0-2022-39200)
Vulnerability from nvd – Published: 2022-09-12 20:10 – Updated: 2025-04-23 17:12
VLAI
EPSS
VEX
Title
Signature checks not applied to some retrieved missing events
Summary
Dendrite is a Matrix homeserver written in Go. In affected versions events retrieved from a remote homeserver using the `/get_missing_events` path did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint. Note that this does not apply to events retrieved through other endpoints (e.g. `/event`, `/state`) as they have been correctly verified. Homeservers that have federation disabled are not vulnerable. The problem has been fixed in Dendrite 0.9.8. Users are advised to upgrade. There are no known workarounds for this issue.
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/matrix-org/dendrite/security/a… | x_refsource_CONFIRM |
| https://github.com/matrix-org/dendrite/commit/279… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| matrix-org | dendrite |
Affected:
< 0.9.8
|
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CVE-2026-63097 (GCVE-0-2026-63097)
Vulnerability from cvelistv5 – Published: 2026-07-17 15:32 – Updated: 2026-07-17 15:32 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
Dendrite 0.13.8 syncapi /context Endpoint Post-Leave State Exposure
Summary
Dendrite through 0.13.8 contains an improper access control vulnerability in the syncapi /context endpoint (syncapi/routing/context.go) that allows authenticated local users to access post-leave room state events by exploiting a flawed membership check that evaluates only the RoomExists field while ignoring IsInRoom, HasBeenInRoom, and Membership fields. Attackers who have left a room can call the rooms context API endpoint for a previously permitted event and receive unfiltered current room state that the /messages and /sync endpoints correctly withhold.
Severity
4.3 (Medium)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/geo-chen/oss/blob/main/dendrit… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/dendrite-syn… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| matrix-org | dendrite |
Affected:
0 , ≤ 0.13.8
(semver)
|
Date Public
2026-07-16 00:00
Credits
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CVE-2026-63096 (GCVE-0-2026-63096)
Vulnerability from cvelistv5 – Published: 2026-07-17 15:30 – Updated: 2026-07-17 18:05 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
Dendrite 0.13.8 SSRF via Unauthenticated Legacy Media Download Endpoint
Summary
Dendrite through 0.13.8 contains a server-side request forgery vulnerability that allows unauthenticated attackers to cause the server to open outbound TLS connections to arbitrary hosts and ports by supplying an unvalidated serverName parameter to the legacy media download endpoint. Attackers can exploit distinguishable error response classes and leaked internal IP addresses in error messages to perform blind port scanning and enumerate internal network topology.
Severity
5.8 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/geo-chen/oss/blob/main/dendrit… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/dendrite-ssr… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| matrix-org | dendrite |
Affected:
0 , ≤ 0.13.8
(semver)
|
Date Public
2026-07-16 00:00
Credits
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CVE-2026-63095 (GCVE-0-2026-63095)
Vulnerability from cvelistv5 – Published: 2026-07-17 15:27 – Updated: 2026-07-17 16:00 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
Dendrite 0.13.8 Improper Authorization via POST account/3pid/delete Endpoint
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/geo-chen/oss/blob/main/dendrit… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/dendrite-imp… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| matrix-org | dendrite |
Affected:
0 , ≤ 0.13.8
(semver)
|
Date Public
2026-07-16 00:00
Credits
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CVE-2022-39200 (GCVE-0-2022-39200)
Vulnerability from cvelistv5 – Published: 2022-09-12 20:10 – Updated: 2025-04-23 17:12
VLAI
EPSS
VEX
Title
Signature checks not applied to some retrieved missing events
Summary
Dendrite is a Matrix homeserver written in Go. In affected versions events retrieved from a remote homeserver using the `/get_missing_events` path did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint. Note that this does not apply to events retrieved through other endpoints (e.g. `/event`, `/state`) as they have been correctly verified. Homeservers that have federation disabled are not vulnerable. The problem has been fixed in Dendrite 0.9.8. Users are advised to upgrade. There are no known workarounds for this issue.
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/matrix-org/dendrite/security/a… | x_refsource_CONFIRM |
| https://github.com/matrix-org/dendrite/commit/279… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| matrix-org | dendrite |
Affected:
< 0.9.8
|
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