CVE-2026-45078 — MEDIUM (5.5)

Q: How severe is CVE-2026-45078?

CVE-2026-45078 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-45078?

Check the references section above for vendor advisories and patch information. Affected products include: Element Synapse.

Vulnerability Description

Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, local authenticated users can cause Synapse to starve other requests of CPU and lead to other requests failing, causing other users to be denied service. This vulnerability is fixed in 1.152.1.

CVSS Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Element	Synapse	< 1.152.1

Related Weaknesses (CWE)

CWE-770

References

https://github.com/element-hq/synapse/security/advisories/GHSA-8q93-326v-3m7gMitigationVendor Advisory

FAQ

What is CVE-2026-45078?

CVE-2026-45078 is a vulnerability with a CVSS score of 5.5 (MEDIUM). Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, local authenticated users can cause Synapse to starve other requests of CPU and lead to other requests failing, causing ot...

How severe is CVE-2026-45078?

CVE-2026-45078 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-45078?

Check the references section above for vendor advisories and patch information. Affected products include: Element Synapse.