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Medium 6.3
Lemmy: SSRF in /api/v3/post via Webmention dispatch
Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.19.18, Lemmy allows an authenticated low-privileged user to create a link post through POST /api/v3/post. When a post is created in a public community, the backend asynchronously sends…
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Medium 6.5
Lemmy: SSRF and internal image disclosure in post link metadata via unvalidated og:image
Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.19.18, Lemmy fetches metadata for user-supplied post URLs and, under the default StoreLinkPreviews image mode, downloads the preview image through local pict-rs. While the top-level pa…