CVE-2021-29432— Malicious users could control the content of invitation emails
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I. Basic Information for CVE-2021-29432
Vulnerability Information
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Vulnerability Title
Malicious users could control the content of invitation emails
Source: NVD (National Vulnerability Database)
Vulnerability Description
Sydent is a reference matrix identity server. A malicious user could abuse Sydent to send out arbitrary emails from the Sydent email address. This could be used to construct plausible phishing emails, for example. This issue has been fixed in 4469d1d.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Matrix Sydent 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matrix Sydent是英国Matrix.org基金会的一款Matrix身份验证服务器API的实现。 Sydent 存在安全漏洞，攻击者可利用该漏洞从Sydent电子邮件地址发送任意电子邮件。
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| matrix-org | sydent | < 2.3.0 | - |
II. Public POCs for CVE-2021-29432
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://pypi.org/project/matrix-sydent/x_refsource_MISC
- https://github.com/matrix-org/sydent/releases/tag/v2.3.0x_refsource_MISC
- https://github.com/matrix-org/sydent/security/advisories/GHSA-mh74-4m5g-fcjxx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2021-29432
Same Patch Batch · matrix-org · 2021-04-15 · 4 CVEs total
| CVE-2021-29431 | 7.7 HIGH | SSRF in Sydent due to missing validation of hostnames |
| CVE-2021-29430 | 7.5 HIGH | Denial of service attack via memory exhaustion |
| CVE-2021-29433 | 4.3 MEDIUM | Denial of service (via resource exhaustion) due to improper input validation |
IV. Related Vulnerabilities
Same vendor: matrix-org
- CVE-2025-66622
matrix-sdk-base is vulnerable to DoS via custom m.room.join_ - CVE-2025-59160
matrix-js-sdk has insufficient validation when considering a - CVE-2025-59047
matrix-sdk-base has panic in the `RoomMember::normalized_pow - CVE-2025-53549
Matrix Rust SDK allows SQL injection in the EventCache imple - CVE-2025-48937
matrix-sdk-crypto vulnerable to sender of encrypted events b
Same weakness: CWE-20
V. Comments for CVE-2021-29432
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