CVE WatchSep 24, 2026

CVE-2026-91123

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the iframe src traversal guard did not

CVSS

7.2

High

EPSS

0.3%

p20

KEV

—

Exploit Today

0-100

Published: Sep 24, 2026 · Last modified: Sep 24, 2026 · CWE-22

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-09-252026-10-19

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 iframe src traversal guard did not treat literal backslashes as path separators after decoded dot segments. A crafted source could therefore pass an allowed_iframes subpath check while browser URL normalization moved the iframe outside the intended allowed path. The resulting iframe could load content from a location that the administrator did not allow. This issue is fixed in versions 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0.

Official references

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