CVE-2026-54742— Lemmy 未验证帖子所属社区漏洞
可能的 ATT&CK 技术 1AI
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一、 漏洞 CVE-2026-54742 基础信息
漏洞信息
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Vulnerability Title
Lemmy: `CollectionAdd::Featured` does not check the post is in the community
来源: CVE Program / CVE List V5
Vulnerability Description
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 verify_mod_action authorizes the actor against self.community(), the receive handlers in crates/apub/activities/src/community/collection_add.rs and crates/apub/activities/src/community/collection_remove.rs dereference self.object as an ApubPost and update featured_community without verifying that post.community_id equals community.id. A moderator can therefore target an unrelated post owned by another community, push it into featured feeds and listings, or undo another community's legitimate curation decision. This issue is fixed in versions 0.19.19 and 1.0.0-alpha.20.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-54742 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC高级
未找到公开 POC。
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CVE-2026-54742 补丁与修复 (2)
CVE-2026-54742 厂商安全公告 (1)
CVE-2026-54742 厂商页面 (3)
- 🔗 Release 0.19.19 · LemmyNet/lemmy · GitHubx_refsource_MISC
- 🔗 Release 1.0.0-alpha.20 · LemmyNet/lemmy · GitHubx_refsource_MISC
同批安全公告 · LemmyNet · 2026-08-19 · 共 6 条
| CVE-2026-54739 | 6.9 MEDIUM | Lemmy 登录端点用户枚举漏洞 |
| CVE-2026-54740 | 6.5 MEDIUM | Lemmy 低权限联邦版主可移除高级版主漏洞 |
| CVE-2026-54738 | 6.5 MEDIUM | Lemmy 通过伪造 X-Forwarded-For 头绕过限速 |
| CVE-2026-54743 | 6.4 MEDIUM | Lemmy 存储型XSS漏洞（通过markdown图片alt-text在lemmy-ui html5-embed中） |
| CVE-2026-54741 | 5.3 MEDIUM | Lemmy 被屏蔽用户可编辑封禁前私信漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-54742
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