CVE-2020-26891
MEDIUM6.1EPSS 0.44%Cross-site scripting (XSS) vulnerability in the fallback authentication endpoint
發布日:2020/10/16修改日:2026/5/20
描述
AuthRestServlet in Matrix Synapse before 1.21.0 is vulnerable to XSS due to unsafe interpolation of the session GET parameter. This allows a remote attacker to execute an XSS attack on the domain Synapse is hosted on, by supplying the victim user with a malicious URL to the /_matrix/client/r0/auth/*/fallback/web or /_matrix/client/unstable/auth/*/fallback/web Synapse endpoints.
受影響套件(3)
- Debian/matrix-synapsefrom 0, < 1.21.1-1
- PyPI/matrix-synapsefrom 0, < 1.21.0
- PyPI/matrix-synapsefrom 0, < 1.21.0
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N |
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
參考連結(9)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2020-26891
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2020-26891
- PATCHhttps://github.com/matrix-org/synapse
- WEBhttps://github.com/matrix-org/synapse/pull/8444
- WEBhttps://github.com/matrix-org/synapse/releases
- WEBhttps://github.com/matrix-org/synapse/releases/tag/v1.21.2
- WEBhttps://github.com/matrix-org/synapse/security/advisories/GHSA-3x8c-fmpc-5rmq
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2020-238.yaml
- WEBhttps://matrix.org/blog/2020/10/15/synapse-1-21-2-released-and-security-advisory