ALPINE-CVE-2020-26891

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Source
https://security.alpinelinux.org/vuln/CVE-2020-26891
Import Source
https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json
JSON Data
https://api.osv.dev/v1/vulns/ALPINE-CVE-2020-26891
Upstream
Published
2020-10-19T17:15:13Z
Modified
2026-11-03T06:32:31Z
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

Alpine:v3.13
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"
Alpine:v3.14
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"
Alpine:v3.15
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"
Alpine:v3.16
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"
Alpine:v3.17
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"
Alpine:v3.18
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"
Alpine:v3.19
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"
Alpine:v3.20
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"
Alpine:v3.21
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"
Alpine:v3.22
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"
Alpine:v3.23
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"
Alpine:v3.24
synapse

Package

Name
synapse
Purl
pkg:apk/alpine/synapse?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.21.1-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-26891.json"