---
id: CVE-2026-54741
title: Lemmy is a link aggregator and forum for the fediverse
summary: >-
  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_pri…
severity: none
cwe:
  - CWE-862
published: '2026-08-19'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:15:59.613'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54741'
references:
  - url: >-
      https://github.com/LemmyNet/lemmy/commit/051b317c9d14b91972bb372c67f319d6900beb93
    label: security-advisories@github.com
  - url: >-
      https://github.com/LemmyNet/lemmy/commit/2d169d630b86b9351e4b1dca451214b741f46150
    label: security-advisories@github.com
  - url: 'https://github.com/LemmyNet/lemmy/pull/6472'
    label: security-advisories@github.com
  - url: 'https://github.com/LemmyNet/lemmy/pull/6476'
    label: security-advisories@github.com
  - url: 'https://github.com/LemmyNet/lemmy/releases/tag/0.19.19'
    label: security-advisories@github.com
  - url: 'https://github.com/LemmyNet/lemmy/releases/tag/1.0.0-alpha.18'
    label: security-advisories@github.com
  - url: 'https://github.com/LemmyNet/lemmy/security/advisories/GHSA-46g9-847m-qf8r'
    label: security-advisories@github.com
  - url: 'https://github.com/LemmyNet/lemmy/security/advisories/GHSA-46g9-847m-qf8r'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00484
epssPercentile: 0.39002
ingestedAt: '2026-09-09T21:22:45.544Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.