CVE-2026-91134

01/תיאור (מקור, אנגלית)

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the Discourse post sanitizer allowed a stored cross-origin iframe to bypass the allowed_iframes prefix policy when the iframe src contained encoded userinfo. The sanitizer validated a decoded form differently from the stored iframe src, allowing the browser to interpret an attacker-controlled host while the allowlist check accepted the encoded URL as an allowed prefix. An authenticated user with posting privileges could persist the iframe in a post and cause attacker-controlled cross-origin content to be rendered. This issue is fixed in versions 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0.

02/קישורים6

• github.com/discourse/discourse/commit/0a8015e6c7a5079981843721‮…
• github.com/discourse/discourse/commit/1304b0c04f87534053b0d574‮…
• github.com/discourse/discourse/commit/bac7dd120191185146248327‮…
• github.com/discourse/discourse/commit/fed3a58c48412ce7207b72a4‮…
• github.com/discourse/discourse/pull/42882
• github.com/discourse/discourse/security/advisories/GHSA-54vw-c‮…