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CVE-2026-45078
medium
CVSS 5.5
Vulnerability in matrix-synapse (CVE-2026-45078)
Summary
vulnerability in matrix-synapse (CVE-2026-45078). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `1.152.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-45078** has been found in matrix-synapse.
Risk of unauthorized operations or information disclosure. CVSS score: 5.5/10.
What to do: upgrade matrix-synapse to **1.152.1** or later.
If unsure, ask your IT team or search "matrix-synapse CVE-2026-45078" on the vendor's site.
CVE-2026-45078 (matrix-synapse) — CWE-400 / CVSS v3 5.5
Attack vector: local / no user interaction
Patched: `1.152.1` — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (CWE-400) exists in matrix-synapse.
📍 Affected scope
matrix-synapse — .
🔥 Severity
Severity: Medium (CVSS 5.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.152.1**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'matrix-synapse' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'matrix-synapse' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `matrix-synapse` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade matrix-synapse to 1.152.1ステージング環境で 1.152.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
pip
matrix-synapse
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.152.1"}]}]
PyPI
matrix-synapse
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.152.1"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-45078
- package https://github.com/element-hq/synapse
- web https://github.com/element-hq/synapse/security/advisories/GHSA-8q93-326v-3m7g
- web https://github.com/element-hq/synapse/issues/19394
- web https://github.com/element-hq/synapse/commit/3f58bc50dfba5768ee43ce48c5e74c25ba0b078a
- web https://github.com/advisories/GHSA-8q93-326v-3m7g
- web https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2026-191.yaml