UBUNTU-CVE-2020-26891

See a problem?
Source
https://ubuntu.com/security/notices/UBUNTU-CVE-2020-26891
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-26891.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-26891
Related
Published
2020-10-19T17:15:00Z
Modified
2020-10-19T17:15:00Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
[none]
Details

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

Affected packages

Ubuntu:Pro:18.04:LTS / matrix-synapse

Package

Name
matrix-synapse

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.19.2+dfsg-6
0.24.0+dfsg-1
0.24.0+dfsg-1ubuntu0.1~esm1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:20.04:LTS / matrix-synapse

Package

Name
matrix-synapse

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.3.0-1
1.4.0-1
1.5.0-1
1.5.1-1
1.6.0-1
1.6.1-1
1.7.0-2
1.7.1-1
1.7.2-1
1.7.3-1
1.8.0-1
1.9.0-1
1.9.1-1
1.10.0-1
1.10.0-2
1.11.0-1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:22.04:LTS / matrix-synapse

Package

Name
matrix-synapse

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.39.0-1
1.47.0-2
1.47.1-1
1.48.0-1
1.49.0-1
1.49.2-1
1.50.1-1
1.50.2-1
1.51.0-1
1.52.0-1
1.53.0-1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}