CVE-2026-54739mediumCWE-204

CVE-2026-54739: fallo de gravedad media en LemmyNet lemmy

Lemmy: Login Endpoint User Enumeration via HTTP Response Code Differential

Publicada el · Actualizada el

Seguir esta CVE+ Monitorear lemmy

Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.

13Vexday Risk Score

Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.

ssvc Trackcvss 6.9epss 0.6%
Lemmy is a link aggregator and forum for the fediverse. Prior to 0.19.19 and 1.0.0-beta.1, Lemmy's login endpoint in crates/api/api/src/local_user/login.rs returns different errors depending on whether the username_or_email value exists. LocalUserView::find_by_email_or_name propagates a NotFound response for an unknown account, while an existing account with a wrong password returns LemmyErrorType::IncorrectLogin. This observable response discrepancy, including HTTP 404 for a nonexistent account and HTTP 400 for an incorrect password on an existing account, allows an unauthenticated attacker to confirm registered usernames or email addresses and use the results for targeted credential attacks or social engineering. This issue is fixed in versions 0.19.19 and 1.0.0-beta.1.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Productos afectados
LemmyNet · lemmy
CVEs relacionadas — LemmyNet lemmy

En el mismo producto, de las más peligrosas a las menos.

CVE-2026-54738MEDIUMLemmy: Rate limit bypass via X-Forwarded-For header spoofing in actix-web ConnectionInfoEPSS 0.6%CVE-2026-54742MEDIUMLemmy: `CollectionAdd::Featured` does not check the post is in the communityEPSS 0.5%CVE-2026-54743MEDIUMLemmy: Stored XSS via markdown image alt-text in lemmy-ui html5-embedEPSS 0.5%CVE-2024-23649HIGHAny authenticated user may obtain private message details from other users on the same instanceEPSS 0.5%CVE-2026-54741MEDIUMLemmy: Blocked users can edit private messages sent before the blockEPSS 0.5%CVE-2026-54740MEDIUMLemmy: Lower-ranked federated moderator can remove higher-ranked moderatorsEPSS 0.4%