Moderate severityNVD Advisory· Published Oct 19, 2020· Updated Aug 4, 2024
CVE-2020-26891
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-synapsePyPI | < 1.21.0 | 1.21.0 |
Affected products
3- Matrix/Synapsedescription
- ghsa-coords2 versions
< 1.21.0+ 1 more
- (no CPE)range: < 1.21.0
- (no CPE)range: < 1.43.0-1.1
Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-3x8c-fmpc-5rmqghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2020-26891ghsaADVISORY
- github.com/matrix-org/synapse/pull/8444ghsax_refsource_MISCWEB
- github.com/matrix-org/synapse/releasesghsaWEB
- github.com/matrix-org/synapse/releases/tag/v1.21.2ghsax_refsource_MISCWEB
- github.com/matrix-org/synapse/security/advisories/GHSA-3x8c-fmpc-5rmqghsax_refsource_CONFIRMWEB
- github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2020-238.yamlghsaWEB
- matrix.org/blog/2020/10/15/synapse-1-21-2-released-and-security-advisoryghsax_refsource_MISCWEB
News mentions
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