CVE Explorer

CVE-2026-45076

Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This vulnerability is fixed in 1.152.1.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:30601e38422a10480f8488d76ac57749ffd73a3ea1adda3b8b15ce4342e640d8

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"synapse","vendor":"element-hq","versions":[{"status":"affected","version":"< 1.152.1"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:7f132a4df06f5a4bd592709f902c02fd0273b1a00806db563cdb4d15f6e5cbdb · sha256:e632474e38a74772… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","privilegesRequired":"HIGH","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:7f132a4df06f5a4bd592709f902c02fd0273b1a00806db563cdb4d15f6e5cbdb · sha256:e632474e38a74772… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:7f132a4df06f5a4bd592709f902c02fd0273b1a00806db563cdb4d15f6e5cbdb · sha256:e632474e38a74772… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"name":"https://github.com/element-hq/synapse/security/advisories/GHSA-6qf2-7x63-mm6v","tags":["x_refsource_CONFIRM"],"url":"https://github.com/element-hq/synapse/security/advisories/GHSA-6qf2-7x63-mm6v"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:7f132a4df06f5a4bd592709f902c02fd0273b1a00806db563cdb4d15f6e5cbdb · sha256:e632474e38a74772… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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