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 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.
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.
- 🔗 github.com/discourse/discourse/security/advisories/G…
- 🔗 github.com/discourse/discourse/pull/42882
- 🔗 github.com/discourse/discourse/commit/042d7b159beda4…
- 🔗 github.com/discourse/discourse/commit/097ce5600a2d74…
- 🔗 github.com/discourse/discourse/commit/0b5a27e689925e…
- 🔗 github.com/discourse/discourse/commit/142f5155ad8e56…
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📊 Historien-Charts — Criticals-Trend · Vendors · EPSS-Verteilung
| Tier | 2026-09-13 | 2026-09-26 |
|---|---|---|
| ≥90 % | 0 | 497 |
| ≥50 % | 0 | 1467 |
| ≥10 % | 0 | 1 |
| <10 % | 300 | 0 |
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 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.
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 the
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