matrix-synapse has 33 CVEs on record between 2020 and 2026. The median CVSS is 5.5 (medium). 3% have been exploited in the wild, in line with the corpus average.
CVEs per month
Last 12 months, by publish date
1025/101125/111225/120126/010226/020326/030426/040526/050626/060726/070826/080926/09
- Exploited share
- 3% vs 1% corpus
- Median CVSS
- 5.5
- Publish → KEV
- —
- Last 90 days
- 0 prev 2
Products
- matrix-synapse 33
33
Total CVEs
0
Critical
0
CISA KEV
1
Exploited
Worst active — by depth score
matrix-synapse vulnerabilities
CVEs affecting matrix-synapse, newest first. Open any entry for full detail, references, and exploit status.
33 CVEsRSS
CVE-2020-26257Medium· 6.5Denial of service attack via incorrect parameters in Matrix Synapse
Denial of service attack via incorrect parameters in Matrix Synapse
▾ Sunlitmatrix-synapse · matrix-synapseEPSS 2.4%via OSV
CVE-2020-26890High· 7.5Denial of service attack due to invalid JSON
Denial of service attack due to invalid JSON
▾ Twilightmatrix-synapse · matrix-synapseEPSS 3.0%via OSV
CVE-2020-26891Medium· 6.1Cross-site scripting (XSS) vulnerability in the fallback authentication endpoint
Cross-site scripting (XSS) vulnerability in the fallback authentication endpoint
▾ Sunlitmatrix-synapse · matrix-synapseEPSS 1.9%via OSV