CVE-2020-26891

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.

Risk Information

Base Score

6.1

MODERATE

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Score

Exploitation Probability

0.616

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2020-26891 are fixed in Python-matrix-synapse 1.21.0	Windows
Vulnerabilities CVE-2020-26891 are fixed in Python-matrix-synapse for linux 1.21.0	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234