PYSEC-2026-664 Matrix Synapse Security Filtering Flaw

The ongetmissingevents function in handlers/federation.py in Matrix Synapse before 0.31.1 has a security bug in the getmissingevents federation API where event visibility rules were not applied correctly...

CVE-2026-58593

NodeBB does not bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. The inbound middleware verifies the HTTP-signature actor and checks the origin of object.id, but never validates that attributedTo corresponds to the sender. In the object mock, attributedT...

CVE-2026-58593

NodeBB does not bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. The inbound middleware verifies the HTTP-signature actor and checks the origin of object.id, but never validates that attributedTo corresponds to the sender. In the object mock, attributedT...

CVE-2026-58593 NodeBB - ActivityPub Author Spoofing via Unvalidated attributedTo Mapped to Local User

NodeBB does not bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. The inbound middleware verifies the HTTP-signature actor and checks the origin of object.id, but never validates that attributedTo corresponds to the sender. In the object mock, attributedT...

CVE-2026-58593 NodeBB - ActivityPub Author Spoofing via Unvalidated attributedTo Mapped to Local User

NodeBB does not bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. The inbound middleware verifies the HTTP-signature actor and checks the origin of object.id, but never validates that attributedTo corresponds to the sender. In the object mock, attributedT...

EUVD-2026-41131

NodeBB does not bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. The inbound middleware verifies the HTTP-signature actor and checks the origin of object.id, but never validates that attributedTo corresponds to the sender. In the object mock, attributedT...

CVE-2026-58593

NodeBB is affected by CVE-2026-58593 where inbound ActivityPub objects are not correctly bound to the authenticated remote actor. The middleware verifies the HTTP-signature actor and origin of object.id but does not validate that attributedTo corresponds to the sender, treating attributedTo as a ...

CVE-2026-58593 NodeBB - ActivityPub Author Spoofing via Unvalidated attributedTo Mapped to Local User

NodeBB does not bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. The inbound middleware verifies the HTTP-signature actor and checks the origin of object.id, but never validates that attributedTo corresponds to the sender. In the object mock, attributedT...

CVE-2026-58593: Insufficient Verification of Data Authenticity

NodeBB does not bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. The inbound middleware verifies the HTTP-signature actor and checks the origin of object.id, but never validates that attributedTo corresponds to the sender. In the object mock, attributedT...

PT-2026-54922

Name of the Vulnerable Software and Affected Versions NodeBB affected versions not specified Description NodeBB fails to bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. While the inbound middleware verifies the HTTP-signature actor and the origin of the...

RabbitMQ has predictable credential obfuscation seed value used in Shovel and Federation plugins

Impact Shovel and Federation plugins perform URI obfuscation in their worker link state. The encryption key used to encrypt the URI was seeded with a predictable secret. This means that in case of certain exceptions related to Shovel and Federation plugins, reasonably easily deobfuscatable data...

GHSA-V9GV-XP36-JGJ8 RabbitMQ has predictable credential obfuscation seed value used in Shovel and Federation plugins

Impact Shovel and Federation plugins perform URI obfuscation in their worker link state. The encryption key used to encrypt the URI was seeded with a predictable secret. This means that in case of certain exceptions related to Shovel and Federation plugins, reasonably easily deobfuscatable data...

Improper Authorization

org.openidentityplatform.openam, openam-federation-library is vulnerable to Improper Authorization. The vulnerability is due to improper authorization checks in the Liberty Web Services SOAP receiver, which allows an unauthenticated remote attacker to write persistent entries into the Liberty...

PT-2026-51443

Open Access Management OpenAM is an access management solution. Prior to 16.1.1, certain federation endpoints in a non-default clustered configuration inconsistently encode user-supplied parameters rendered into HTML in the SAML2 cluster cookie-hash redirect path. An unauthenticated attacker can...

GHSA-48PQ-2XQ3-C2M4 CoreWCF: SAML SubjectConfirmation methods and holder-of-key proof keys are not enforced

Impact The relying application is given a ClaimsPrincipal for a subject whose authority over the assertion the sender never proved. There are two distinct exploit shapes: - Holder-of-key downgrade. An attacker who obtains a holder-of-key SAML assertion that was issued without KeyInfo issuer bug,...

PT-2026-51078

Name of the Vulnerable Software and Affected Versions CoreWCF versions prior to 1.8.1 CoreWCF versions prior to 1.9.1 Description SAML token validation in the SamlSecurityTokenHandler does not enforce SubjectConfirmation method URIs or holder-of-key proof keys. This allows an attacker to...

Directory Traversal

Overview Affected versions of this package are vulnerable to Directory Traversal in the FileInfo.Name field during federation sync. An attacker can overwrite or create files in arbitrary locations within the server's filestore by sending specially crafted filenames containing path traversal...

Directory Traversal

Overview github.com/mattermost/mattermost/server/channels/app is a private-cloud Slack alternative Affected versions of this package are vulnerable to Directory Traversal in the FileInfo.Name field during federation sync. An attacker can overwrite or create files in arbitrary locations within the...

Directory Traversal

Overview Affected versions of this package are vulnerable to Directory Traversal in the FileInfo.Name field during federation sync. An attacker can overwrite or create files in arbitrary locations within the server's filestore by sending specially crafted filenames containing path traversal...

Directory Traversal

Overview Affected versions of this package are vulnerable to Directory Traversal in the FileInfo.Name field during federation sync. An attacker can overwrite or create files in arbitrary locations within the server's filestore by sending specially crafted filenames containing path traversal...