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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-45076

16
FAUCET Score

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.

First published: May 28, 2026Last modified: May 28, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 1.152.1CPE matchmatch criteria
cpe:2.3:a:element:synapse:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

5.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 45th percentile among its peer group of 708 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.0 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

pippatch availablevia ghsa
Product: matrix-synapseFixed in: 1.152.1
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

pipGHSA-6qf2-7x63-mm6vmedium

Synapse pagination Denial of Service

May 14, 2026

References

github.com / element-hq/synapse/security/advisories/GHSA-6qf2-7x63-mm6v
Vendor Advisory