CyberRota Analysis
AI-GeneratedLemmy versions prior to 0.19.19 and 1.0.0-alpha.18 allow blocked senders to edit previously sent private messages, circumventing the recipient's block list and enabling potential harassment. This vulnerability poses a risk to user privacy and safety, particularly for those who rely on blocking features to manage unwanted interactions. Organizations using affected versions should prioritize updating to the patched releases to mitigate this risk.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Lemmy is a link aggregator and forum for the fediverse. Prior to 0.19.19 and 1.0.0-alpha.18, Lemmy blocks new private messages from a sender after the recipient blocks that sender, but the edit path skips the same block check. create_private_message checks the recipient's block list with PersonActions::read_block before inserting a message, while edit_private_message in crates/api/api_crud/src/private_message/update.rs only checks that the caller is orig_private_message.creator_id. The update then writes new content and returns the modified PrivateMessageView without consulting the recipient's block list, allowing a blocked sender to keep changing an old message that the recipient can still see and providing a post-block harassment path. This issue is fixed in versions 0.19.19 and 1.0.0-alpha.18.