CVE-2026-4054: Improper Check for Unusual or Exceptional Conditions

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13, 11.4.x = 11.4.3 Fail to validate the response body of proxied images, which allows a remote attacker to enact client-side DoS via an SVG file served from an attacker-controlled origin under a non-SVG Content-Type header e.g. image/png...

CVE-2026-42181: Server-Side Request Forgery (SSRF)

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 page URL is checked against internal IP...

PT-2026-36864

Summary 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 page URL is checked against internal IP ranges, the extracted og:image URL is not subject to the same restriction...

BugPoC: LFI to steal /etc/passwd - Bypass filter in the <meta property="og:image"> tag via redirect and much more

Hey Team, Good &simple challenge. Wasn't able to find time to attempt this initially but was able to go about it today. The explanation of the bug with the POC is hosted on bugpoc.com Here is the id & password as requested - BugPoC ID : bp-wHwB2qAF - Password : dARKlYbAnana89 POC Screenshot using...