Dashboard / CVE-2026-45076

CVE-2026-45076

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 55/100
Published: 2026-05-28 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: High
UI: None
S: X
AT: None
VC: None
VI: None
VA: Low

Description

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
element synapse < 1.152.1

References & Advisories (1)

Bug Bounty Relevance

55 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

5.1 / 10.0 v4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.37%
Raw Score 0.003690
Percentile 30.7%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00369
2026-10-28
0.00369

Intelligence Sources

nvd ref →

External Links