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CVE-2022-31152

24
FAUCET Score

CVE-2022-31152 affects Synapse, an open-source Matrix homeserver, due to incorrect application of event authorization rules in versions up to 1.61.0. This allows attackers to craft events that Synapse accepts but spec-conformant servers reject, potentially causing room state divergence. Rated 7.5 HIGH, it has a network attack vector, low complexity, and high impact on availability, though confidentiality and integrity are not directly affected. There is no evidence of active exploitation, public exploit code, or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.62.0CPE matchmatch criteria
cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.4MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.94%
Probability of exploitation in next 30 days
EPSS Percentile
57.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0094 is in the 32nd percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: matrix-synapseFixed in: 1.62.0rc1

Vendor Advisories (1)

pipGHSA-jhjh-776m-4765high

Denial of service due to incorrect application of event authorization rules

Aug 31, 2022

References

github.com / matrix-org/synapse/pull/13087
Issue TrackingPatchThird Party Advisory
github.com / matrix-org/synapse/pull/13088
Issue TrackingPatchThird Party Advisory
github.com / matrix-org/synapse/releases/tag/v1.62.0
Release NotesThird Party Advisory
github.com / matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765
Issue TrackingMitigationThird Party Advisory