Vulnerability · Published Mar 26, 2021 · Assigned by GitHub_M
CVE-2021-21332Cross-site scripting (XSS) vulnerability in the password reset endpoint
Medium 6.9
In plain English
A medium-severity cross-site scripting in synapse from matrix-org. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.27.0, the password reset endpoint served via Synapse was vulnerable to cross-site scripting (XSS) attacks. The impact depends on the configuration of the domain that Synapse is deployed on, but may allow access to cookies and other browser data, CSRF vulnerabilities, and access to other resources served on the same domain or parent domains. This is fixed in version 1.27.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | matrix-synapse | 1.27.0-1 | DEBIAN-CVE-2021-21332 |
| PyPI | matrix-synapse | 1.27.0 | GHSA-246w-56m2-5899 |
| PyPI | matrix-synapse | 1.27.0 | PYSEC-2021-133 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| matrix-org | synapse | < 1.27.0 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
References
- https://github.com/matrix-org/synapse/security/advisories/GHSA-246w-56m2-5899 x_refsource_CONFIRM
- https://github.com/matrix-org/synapse/releases/tag/v1.27.0 x_refsource_MISC
- https://github.com/matrix-org/synapse/pull/9200 x_refsource_MISC
- https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df x_refsource_MISC
- FEDORA-2021-a627cfd31e vendor-advisory, x_refsource_FEDORA