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Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2020-26891

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 68.7%
CVSS Severity
CVSS v3 Score 6.1
CVSS v2 Score 4.3
Products affected by CVE-2020-26891
  • Matrix » Synapse » Version: N/A
    cpe:2.3:a:matrix:synapse:-
  • Matrix » Synapse » Version: 0.0.1
    cpe:2.3:a:matrix:synapse:0.0.1
  • Matrix » Synapse » Version: 0.1.0
    cpe:2.3:a:matrix:synapse:0.1.0
  • Matrix » Synapse » Version: 0.1.1
    cpe:2.3:a:matrix:synapse:0.1.1
  • Matrix » Synapse » Version: 0.1.2
    cpe:2.3:a:matrix:synapse:0.1.2
  • Matrix » Synapse » Version: 0.10.0
    cpe:2.3:a:matrix:synapse:0.10.0
  • Matrix » Synapse » Version: 0.10.1
    cpe:2.3:a:matrix:synapse:0.10.1
  • Matrix » Synapse » Version: 0.11.0
    cpe:2.3:a:matrix:synapse:0.11.0
  • Matrix » Synapse » Version: 0.11.1
    cpe:2.3:a:matrix:synapse:0.11.1
  • Matrix » Synapse » Version: 0.12.0
    cpe:2.3:a:matrix:synapse:0.12.0
  • Matrix » Synapse » Version: 0.12.1
    cpe:2.3:a:matrix:synapse:0.12.1
  • Matrix » Synapse » Version: 0.13.0
    cpe:2.3:a:matrix:synapse:0.13.0
  • Matrix » Synapse » Version: 0.13.1
    cpe:2.3:a:matrix:synapse:0.13.1
  • Matrix » Synapse » Version: 0.13.2
    cpe:2.3:a:matrix:synapse:0.13.2
  • Matrix » Synapse » Version: 0.13.3
    cpe:2.3:a:matrix:synapse:0.13.3
  • Matrix » Synapse » Version: 0.14.0
    cpe:2.3:a:matrix:synapse:0.14.0
  • Matrix » Synapse » Version: 0.15.0
    cpe:2.3:a:matrix:synapse:0.15.0
  • Matrix » Synapse » Version: 0.16.0
    cpe:2.3:a:matrix:synapse:0.16.0
  • Matrix » Synapse » Version: 0.16.1
    cpe:2.3:a:matrix:synapse:0.16.1
  • Matrix » Synapse » Version: 0.17.0
    cpe:2.3:a:matrix:synapse:0.17.0
  • Matrix » Synapse » Version: 0.17.1
    cpe:2.3:a:matrix:synapse:0.17.1
  • Matrix » Synapse » Version: 0.17.2
    cpe:2.3:a:matrix:synapse:0.17.2
  • Matrix » Synapse » Version: 0.17.3
    cpe:2.3:a:matrix:synapse:0.17.3
  • Matrix » Synapse » Version: 0.18.0
    cpe:2.3:a:matrix:synapse:0.18.0
  • Matrix » Synapse » Version: 0.18.1
    cpe:2.3:a:matrix:synapse:0.18.1
  • Matrix » Synapse » Version: 0.18.2
    cpe:2.3:a:matrix:synapse:0.18.2
  • Matrix » Synapse » Version: 0.18.3
    cpe:2.3:a:matrix:synapse:0.18.3
  • Matrix » Synapse » Version: 0.18.4
    cpe:2.3:a:matrix:synapse:0.18.4
  • Matrix » Synapse » Version: 0.18.5
    cpe:2.3:a:matrix:synapse:0.18.5
  • Matrix » Synapse » Version: 0.18.6
    cpe:2.3:a:matrix:synapse:0.18.6
  • Matrix » Synapse » Version: 0.18.7
    cpe:2.3:a:matrix:synapse:0.18.7
  • Matrix » Synapse » Version: 0.19.0
    cpe:2.3:a:matrix:synapse:0.19.0
  • Matrix » Synapse » Version: 0.19.1
    cpe:2.3:a:matrix:synapse:0.19.1
  • Matrix » Synapse » Version: 0.19.2
    cpe:2.3:a:matrix:synapse:0.19.2
  • Matrix » Synapse » Version: 0.19.3
    cpe:2.3:a:matrix:synapse:0.19.3
  • Matrix » Synapse » Version: 0.2.0
    cpe:2.3:a:matrix:synapse:0.2.0
  • Matrix » Synapse » Version: 0.2.1
    cpe:2.3:a:matrix:synapse:0.2.1
  • Matrix » Synapse » Version: 0.2.2
    cpe:2.3:a:matrix:synapse:0.2.2
  • Matrix » Synapse » Version: 0.2.3
    cpe:2.3:a:matrix:synapse:0.2.3
  • Matrix » Synapse » Version: 0.20.0
    cpe:2.3:a:matrix:synapse:0.20.0
  • Matrix » Synapse » Version: 0.21.0
    cpe:2.3:a:matrix:synapse:0.21.0
  • Matrix » Synapse » Version: 0.21.1
    cpe:2.3:a:matrix:synapse:0.21.1
  • Matrix » Synapse » Version: 0.22.0
    cpe:2.3:a:matrix:synapse:0.22.0
  • Matrix » Synapse » Version: 0.22.1
    cpe:2.3:a:matrix:synapse:0.22.1
  • Matrix » Synapse » Version: 0.23.0
    cpe:2.3:a:matrix:synapse:0.23.0
  • Matrix » Synapse » Version: 0.23.1
    cpe:2.3:a:matrix:synapse:0.23.1
  • Matrix » Synapse » Version: 0.24.0
    cpe:2.3:a:matrix:synapse:0.24.0
  • Matrix » Synapse » Version: 0.24.1
    cpe:2.3:a:matrix:synapse:0.24.1
  • Matrix » Synapse » Version: 0.25.0
    cpe:2.3:a:matrix:synapse:0.25.0
  • Matrix » Synapse » Version: 0.25.1
    cpe:2.3:a:matrix:synapse:0.25.1
  • Matrix » Synapse » Version: 0.26.0
    cpe:2.3:a:matrix:synapse:0.26.0
  • Matrix » Synapse » Version: 0.26.1
    cpe:2.3:a:matrix:synapse:0.26.1
  • Matrix » Synapse » Version: 0.27.0
    cpe:2.3:a:matrix:synapse:0.27.0
  • Matrix » Synapse » Version: 0.27.1
    cpe:2.3:a:matrix:synapse:0.27.1
  • Matrix » Synapse » Version: 0.27.2
    cpe:2.3:a:matrix:synapse:0.27.2
  • Matrix » Synapse » Version: 0.27.3
    cpe:2.3:a:matrix:synapse:0.27.3
  • Matrix » Synapse » Version: 0.27.4
    cpe:2.3:a:matrix:synapse:0.27.4
  • Matrix » Synapse » Version: 0.28.0
    cpe:2.3:a:matrix:synapse:0.28.0
  • Matrix » Synapse » Version: 0.28.1
    cpe:2.3:a:matrix:synapse:0.28.1
  • Matrix » Synapse » Version: 0.29.0
    cpe:2.3:a:matrix:synapse:0.29.0
  • Matrix » Synapse » Version: 0.29.1
    cpe:2.3:a:matrix:synapse:0.29.1
  • Matrix » Synapse » Version: 0.3.0
    cpe:2.3:a:matrix:synapse:0.3.0
  • Matrix » Synapse » Version: 0.3.1
    cpe:2.3:a:matrix:synapse:0.3.1
  • Matrix » Synapse » Version: 0.3.2
    cpe:2.3:a:matrix:synapse:0.3.2
  • Matrix » Synapse » Version: 0.3.3
    cpe:2.3:a:matrix:synapse:0.3.3
  • Matrix » Synapse » Version: 0.3.4
    cpe:2.3:a:matrix:synapse:0.3.4
  • Matrix » Synapse » Version: 0.30.0
    cpe:2.3:a:matrix:synapse:0.30.0
  • Matrix » Synapse » Version: 0.31.0
    cpe:2.3:a:matrix:synapse:0.31.0
  • Matrix » Synapse » Version: 0.31.1
    cpe:2.3:a:matrix:synapse:0.31.1
  • Matrix » Synapse » Version: 0.31.2
    cpe:2.3:a:matrix:synapse:0.31.2
  • Matrix » Synapse » Version: 0.32.0
    cpe:2.3:a:matrix:synapse:0.32.0
  • Matrix » Synapse » Version: 0.32.1
    cpe:2.3:a:matrix:synapse:0.32.1
  • Matrix » Synapse » Version: 0.32.2
    cpe:2.3:a:matrix:synapse:0.32.2
  • Matrix » Synapse » Version: 0.33.0
    cpe:2.3:a:matrix:synapse:0.33.0
  • Matrix » Synapse » Version: 0.33.1
    cpe:2.3:a:matrix:synapse:0.33.1
  • Matrix » Synapse » Version: 0.33.2
    cpe:2.3:a:matrix:synapse:0.33.2
  • Matrix » Synapse » Version: 0.33.2.1
    cpe:2.3:a:matrix:synapse:0.33.2.1
  • Matrix » Synapse » Version: 0.33.3
    cpe:2.3:a:matrix:synapse:0.33.3
  • Matrix » Synapse » Version: 0.33.3.1
    cpe:2.3:a:matrix:synapse:0.33.3.1
  • Matrix » Synapse » Version: 0.33.4
    cpe:2.3:a:matrix:synapse:0.33.4
  • Matrix » Synapse » Version: 0.33.5
    cpe:2.3:a:matrix:synapse:0.33.5
  • Matrix » Synapse » Version: 0.33.5.1
    cpe:2.3:a:matrix:synapse:0.33.5.1
  • Matrix » Synapse » Version: 0.33.6
    cpe:2.3:a:matrix:synapse:0.33.6
  • Matrix » Synapse » Version: 0.33.7
    cpe:2.3:a:matrix:synapse:0.33.7
  • Matrix » Synapse » Version: 0.33.8
    cpe:2.3:a:matrix:synapse:0.33.8
  • Matrix » Synapse » Version: 0.33.9
    cpe:2.3:a:matrix:synapse:0.33.9
  • Matrix » Synapse » Version: 0.34.0
    cpe:2.3:a:matrix:synapse:0.34.0
  • Matrix » Synapse » Version: 0.34.0.1
    cpe:2.3:a:matrix:synapse:0.34.0.1
  • Matrix » Synapse » Version: 0.34.1
    cpe:2.3:a:matrix:synapse:0.34.1
  • Matrix » Synapse » Version: 0.34.1.1
    cpe:2.3:a:matrix:synapse:0.34.1.1
  • Matrix » Synapse » Version: 0.4.0
    cpe:2.3:a:matrix:synapse:0.4.0
  • Matrix » Synapse » Version: 0.4.1
    cpe:2.3:a:matrix:synapse:0.4.1
  • Matrix » Synapse » Version: 0.4.2
    cpe:2.3:a:matrix:synapse:0.4.2
  • Matrix » Synapse » Version: 0.5.0
    cpe:2.3:a:matrix:synapse:0.5.0
  • Matrix » Synapse » Version: 0.5.1
    cpe:2.3:a:matrix:synapse:0.5.1
  • Matrix » Synapse » Version: 0.5.2
    cpe:2.3:a:matrix:synapse:0.5.2
  • Matrix » Synapse » Version: 0.5.3
    cpe:2.3:a:matrix:synapse:0.5.3
  • Matrix » Synapse » Version: 0.5.4
    cpe:2.3:a:matrix:synapse:0.5.4
  • Matrix » Synapse » Version: 0.6.0
    cpe:2.3:a:matrix:synapse:0.6.0
  • Matrix » Synapse » Version: 0.6.1
    cpe:2.3:a:matrix:synapse:0.6.1
  • Matrix » Synapse » Version: 0.7.0
    cpe:2.3:a:matrix:synapse:0.7.0
  • Matrix » Synapse » Version: 0.7.1
    cpe:2.3:a:matrix:synapse:0.7.1
  • Matrix » Synapse » Version: 0.8.0
    cpe:2.3:a:matrix:synapse:0.8.0
  • Matrix » Synapse » Version: 0.8.1
    cpe:2.3:a:matrix:synapse:0.8.1
  • Matrix » Synapse » Version: 0.88.5.1
    cpe:2.3:a:matrix:synapse:0.88.5.1
  • Matrix » Synapse » Version: 0.9.0
    cpe:2.3:a:matrix:synapse:0.9.0
  • Matrix » Synapse » Version: 0.9.1
    cpe:2.3:a:matrix:synapse:0.9.1
  • Matrix » Synapse » Version: 0.9.2
    cpe:2.3:a:matrix:synapse:0.9.2
  • Matrix » Synapse » Version: 0.9.3
    cpe:2.3:a:matrix:synapse:0.9.3
  • Matrix » Synapse » Version: 0.9.4
    cpe:2.3:a:matrix:synapse:0.9.4
  • Matrix » Synapse » Version: 0.99.0
    cpe:2.3:a:matrix:synapse:0.99.0
  • Matrix » Synapse » Version: 0.99.1
    cpe:2.3:a:matrix:synapse:0.99.1
  • Matrix » Synapse » Version: 0.99.1.1
    cpe:2.3:a:matrix:synapse:0.99.1.1
  • Matrix » Synapse » Version: 0.99.2
    cpe:2.3:a:matrix:synapse:0.99.2
  • Matrix » Synapse » Version: 0.99.3
    cpe:2.3:a:matrix:synapse:0.99.3
  • Matrix » Synapse » Version: 0.99.3.1
    cpe:2.3:a:matrix:synapse:0.99.3.1
  • Matrix » Synapse » Version: 0.99.3.2
    cpe:2.3:a:matrix:synapse:0.99.3.2
  • Matrix » Synapse » Version: 0.99.4
    cpe:2.3:a:matrix:synapse:0.99.4
  • Matrix » Synapse » Version: 0.99.5
    cpe:2.3:a:matrix:synapse:0.99.5
  • Matrix » Synapse » Version: 0.99.5.2
    cpe:2.3:a:matrix:synapse:0.99.5.2
  • Matrix » Synapse » Version: 1.0.0
    cpe:2.3:a:matrix:synapse:1.0.0
  • Matrix » Synapse » Version: 1.1.0
    cpe:2.3:a:matrix:synapse:1.1.0
  • Matrix » Synapse » Version: 1.10.0
    cpe:2.3:a:matrix:synapse:1.10.0
  • Matrix » Synapse » Version: 1.10.1
    cpe:2.3:a:matrix:synapse:1.10.1
  • Matrix » Synapse » Version: 1.11.0
    cpe:2.3:a:matrix:synapse:1.11.0
  • Matrix » Synapse » Version: 1.11.1
    cpe:2.3:a:matrix:synapse:1.11.1
  • Matrix » Synapse » Version: 1.12.0
    cpe:2.3:a:matrix:synapse:1.12.0
  • Matrix » Synapse » Version: 1.12.1
    cpe:2.3:a:matrix:synapse:1.12.1
  • Matrix » Synapse » Version: 1.12.2
    cpe:2.3:a:matrix:synapse:1.12.2
  • Matrix » Synapse » Version: 1.12.3
    cpe:2.3:a:matrix:synapse:1.12.3
  • Matrix » Synapse » Version: 1.12.4
    cpe:2.3:a:matrix:synapse:1.12.4
  • Matrix » Synapse » Version: 1.13.0
    cpe:2.3:a:matrix:synapse:1.13.0
  • Matrix » Synapse » Version: 1.14.0
    cpe:2.3:a:matrix:synapse:1.14.0
  • Matrix » Synapse » Version: 1.15.0
    cpe:2.3:a:matrix:synapse:1.15.0
  • Matrix » Synapse » Version: 1.15.1
    cpe:2.3:a:matrix:synapse:1.15.1
  • Matrix » Synapse » Version: 1.15.2
    cpe:2.3:a:matrix:synapse:1.15.2
  • Matrix » Synapse » Version: 1.16.0
    cpe:2.3:a:matrix:synapse:1.16.0
  • Matrix » Synapse » Version: 1.16.1
    cpe:2.3:a:matrix:synapse:1.16.1
  • Matrix » Synapse » Version: 1.17.0
    cpe:2.3:a:matrix:synapse:1.17.0
  • Matrix » Synapse » Version: 1.18.0
    cpe:2.3:a:matrix:synapse:1.18.0
  • Matrix » Synapse » Version: 1.19.0
    cpe:2.3:a:matrix:synapse:1.19.0
  • Matrix » Synapse » Version: 1.19.1
    cpe:2.3:a:matrix:synapse:1.19.1
  • Matrix » Synapse » Version: 1.19.2
    cpe:2.3:a:matrix:synapse:1.19.2
  • Matrix » Synapse » Version: 1.19.3
    cpe:2.3:a:matrix:synapse:1.19.3
  • Matrix » Synapse » Version: 1.2.0
    cpe:2.3:a:matrix:synapse:1.2.0
  • Matrix » Synapse » Version: 1.2.1
    cpe:2.3:a:matrix:synapse:1.2.1
  • Matrix » Synapse » Version: 1.20.0
    cpe:2.3:a:matrix:synapse:1.20.0
  • Matrix » Synapse » Version: 1.3.0
    cpe:2.3:a:matrix:synapse:1.3.0
  • Matrix » Synapse » Version: 1.3.1
    cpe:2.3:a:matrix:synapse:1.3.1
  • Matrix » Synapse » Version: 1.4.0
    cpe:2.3:a:matrix:synapse:1.4.0
  • Matrix » Synapse » Version: 1.4.1
    cpe:2.3:a:matrix:synapse:1.4.1
  • Matrix » Synapse » Version: 1.5.0
    cpe:2.3:a:matrix:synapse:1.5.0
  • Matrix » Synapse » Version: 1.5.1
    cpe:2.3:a:matrix:synapse:1.5.1
  • Matrix » Synapse » Version: 1.6.0
    cpe:2.3:a:matrix:synapse:1.6.0
  • Matrix » Synapse » Version: 1.6.1
    cpe:2.3:a:matrix:synapse:1.6.1
  • Matrix » Synapse » Version: 1.7.0
    cpe:2.3:a:matrix:synapse:1.7.0
  • Matrix » Synapse » Version: 1.7.1
    cpe:2.3:a:matrix:synapse:1.7.1
  • Matrix » Synapse » Version: 1.7.2
    cpe:2.3:a:matrix:synapse:1.7.2
  • Matrix » Synapse » Version: 1.7.3
    cpe:2.3:a:matrix:synapse:1.7.3
  • Matrix » Synapse » Version: 1.8.0
    cpe:2.3:a:matrix:synapse:1.8.0
  • Matrix » Synapse » Version: 1.9.0
    cpe:2.3:a:matrix:synapse:1.9.0
  • Matrix » Synapse » Version: 1.9.1
    cpe:2.3:a:matrix:synapse:1.9.1


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