CVE WatchSep 24, 2026

CVE-2026-91134

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

CVSS

5.4

Medium

EPSS

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KEV

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Exploit Today

0-100

Published: Sep 24, 2026 · Last modified: Sep 24, 2026 · CWE-20

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

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