CVE-2026-54743 Lemmy: Stored XSS via markdown image alt-text in lemmy-ui html5-embed

Lemmy is a link aggregator and forum for the fediverse. Prior to lemmy-ui 0.19.19-beta.1, LemmyNet/lemmy-ui renders Markdown in src/shared/markdown.ts for post bodies, comment bodies, private messages, and community and site sidebars through mdToHtml, which returns a raw html object that Inferno...

CVE-2026-54743 Lemmy: Stored XSS via markdown image alt-text in lemmy-ui html5-embed

Lemmy is a link aggregator and forum for the fediverse. Prior to lemmy-ui 0.19.19-beta.1, LemmyNet/lemmy-ui renders Markdown in src/shared/markdown.ts for post bodies, comment bodies, private messages, and community and site sidebars through mdToHtml, which returns a raw html object that Inferno...

CVE-2026-54742

Lemmy is a link aggregator and forum for the fediverse. From 0.19.18 until 0.19.19 and 1.0.0-alpha.20, a community moderator can feature or unfeature posts in other communities through federated CollectionAdd and CollectionRemove activities using CollectionType::Featured. After verifymodaction...

CVE-2026-54740

In Lemmy versions prior to 0.19.19 and 1.0.0-alpha.18, the federated ActivityPub handler CollectionRemove::receive in crates/apub/activities/src/community/collection_remove.rs omits the rank check (is_higher_mod_or_admin_check) enforced by the local API, allowing any signed ActivityPub Remove act...

CVE-2026-54740 Lemmy: Lower-ranked federated moderator can remove higher-ranked moderators

Lemmy is a link aggregator and forum for the fediverse. Prior to 0.19.19 and 1.0.0-alpha.18, a lower-ranked remote moderator can remove a higher-ranked moderator by sending a signed ActivityPub Remove activity to the target instance. The local API uses LocalUser::ishighermodoradmincheck to enforc...

CVE-2026-54742

In Lemmy versions 0.19.18 through 0.19.19 and 1.0.0-alpha.20, the CollectionAdd::Featured and CollectionRemove handlers in crates/apub/activities/src/community/collection_add.rs and collection_remove.rs dereference self.object as an ApubPost and update featured_community without verifying post.co...

CVE-2026-54742 Lemmy: `CollectionAdd::Featured` does not check the post is in the community

Lemmy is a link aggregator and forum for the fediverse. From 0.19.18 until 0.19.19 and 1.0.0-alpha.20, a community moderator can feature or unfeature posts in other communities through federated CollectionAdd and CollectionRemove activities using CollectionType::Featured. After verifymodaction...

CVE-2026-54742 Lemmy: `CollectionAdd::Featured` does not check the post is in the community

Lemmy is a link aggregator and forum for the fediverse. From 0.19.18 until 0.19.19 and 1.0.0-alpha.20, a community moderator can feature or unfeature posts in other communities through federated CollectionAdd and CollectionRemove activities using CollectionType::Featured. After verifymodaction...

Security Bulletin: IBM® Db2® federated server is affected by a vulnerability in commons-configuration2-2.10.1 (CVE-2026-45205)

Summary IBM® Db2® federated server is affected by a vulnerability in commons-configuration2-2.10.1 CVE-2026-45205 Vulnerability Details CVEID:CVE-2026-45205 DESCRIPTION: Uncontrolled Recursion vulnerability in Apache Commons. When processing an untrusted configuration file, Commons Configuration...

PT-2026-78675

Name of the Vulnerable Software and Affected Versions Lemmy versions prior to 0.19.19 Lemmy versions prior to 1.0.0-alpha.18 Description A lower-ranked remote moderator can remove a higher-ranked moderator by sending a signed ActivityPub Remove activity to the target instance. While the local API...

PT-2026-78677

Name of the Vulnerable Software and Affected Versions Lemmy versions 0.19.18 through 0.19.18 Lemmy versions 1.0.0-alpha.1 through 1.0.0-alpha.19 Description A community moderator can feature or unfeature posts belonging to other communities. This occurs during federated CollectionAdd and...

PT-2026-78746

Name of the Vulnerable Software and Affected Versions Splunk Enterprise versions prior to 10.4.2 Splunk Enterprise versions prior to 10.2.6 Splunk Enterprise versions prior to 10.0.9 Splunk Enterprise versions prior to 9.4.14 Description A low-privileged user without the fsh manage capability can...

EUVD-2026-58817

A flaw was found in Red Hat Quay's JWT JSON Web Token validation for federated robot accounts and single sign-on SSO authentication. Multiple issues related to audience verification and the enforcement of azp and sub claims were identified. These flaws could allow an attacker with a validly-signe...

CVE-2026-74240

A flaw was found in Red Hat Quay's JWT JSON Web Token validation for federated robot accounts and single sign-on SSO authentication. Multiple issues related to audience verification and the enforcement of azp and sub claims were identified. These flaws could allow an attacker with a validly-signe...

CVE-2026-74240 Quay: jwt claim validation bypasses in quay federated robot and sso authentication

A flaw was found in Red Hat Quay's JWT JSON Web Token validation for federated robot accounts and single sign-on SSO authentication. Multiple issues related to audience verification and the enforcement of azp and sub claims were identified. These flaws could allow an attacker with a validly-signe...

CVE-2026-74240

The CVE concerns Red Hat Quay’s JWT validation for federated robot accounts and SSO, where flawed audience verification and insufficient enforcement of azp and sub allow a token from the same identity provider to bypass security boundaries, potentially leading to unauthorized access where audienc...

CVE-2026-74240

A flaw was found in Red Hat Quay's JWT JSON Web Token validation for federated robot accounts and single sign-on SSO authentication. Multiple issues related to audience verification and the enforcement of azp and sub claims were identified. These flaws could allow an attacker with a validly-signe...

PT-2026-72126

Name of the Vulnerable Software and Affected Versions Red Hat Quay affected versions not specified Description Red Hat Quay contains flaws in the validation of JSON Web Tokens JWT used for single sign-on SSO authentication and federated robot accounts. The issues involve improper audience...

CVE-2026-71467

A flaw was found in search-v2-api. The authentication middleware in the affected component unconditionally skips authentication when a request includes an Upgrade: websocket header. An unauthenticated attacker can exploit this by sending a specially crafted HTTP POST request to the /federated...

EUVD-2026-56900

A flaw was found in acm-search-v2-api-rhel9. When the getFederationConfig function refreshes its cache, it improperly reuses a user's bearer token for all subsequent federated requests until the cache expires. This allows other authenticated users to gain unauthorized access to remote managed hub...