VulnerabilityAnalyzed
CVE-2026-27570
As a workaround, tighten access by changing the `ai_bot_public_sharing_allowed_groups` site setting.
MEDIUM 5.1EPSS 0.35%
Does this matter?
Lower severity and a low EPSS score (0.35%). Track it; it rarely justifies an emergency change on its own.
Description
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, the onebox method in the SharedAiConversation model renders the conversation title directly into HTML without proper sanitization. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, tighten access by changing the `ai_bot_public_sharing_allowed_groups` site setting.
- CVSS 4.0
- 5.1 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.35% probability · 28th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- discourse/discourse
- Source
- security-advisories@github.com
References
- https://github.com/discourse/discourse/commit/43a5a60b595f0120e6adfc131f2408508fe341f1Patch
- https://github.com/discourse/discourse/commit/c14f8f52b7999328bd9f8665f2ecfa24dadc4bf1Patch
- https://github.com/discourse/discourse/commit/f2aafa5c7467c94fcd4ebd36785a98e77ca088ccPatch
- https://github.com/discourse/discourse/security/advisories/GHSA-hfxw-89hw-vwmvVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.