CVE - CVE-2020-26891

CVE-ID
CVE-2020-26891	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://github.com/matrix-org/synapse/security/advisories/GHSA-3x8c-fmpc-5rmq MISC:https://github.com/matrix-org/synapse/pull/8444 MISC:https://github.com/matrix-org/synapse/releases/tag/v1.21.2 MISC:https://matrix.org/blog/2020/10/15/synapse-1-21-2-released-and-security-advisory
Assigning CNA
MITRE Corporation
Date Record Created
20201008	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20201008)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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