EUVD-2026-17565Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an authenticated user can obtain shared draft topic titles by sending an inline onebox request with a category_id parameter matching the shared drafts category. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.
AnalysisAI
Discourse versions 2026.1.0 through 2026.1.2, 2026.2.0 through 2026.2.1, and 2026.3.0 prior to patching allow authenticated users to disclose shared draft topic titles via specially crafted inline onebox requests that reference the shared drafts category. An attacker with valid Discourse credentials can enumerate and read draft titles not intended for their access, violating information confidentiality. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Vulnerability AssessmentAI
| Risk Assessment | The CVSS score of 4.3 reflects low-to-medium severity: the attack vector is network (AV:N) and requires low complexity (AC:L), but critically requires an authenticated login (PR:L), and the impact is confined to confidentiality only (C:L; no integrity or availability impact). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated regular user with valid Discourse credentials discovers the inline onebox endpoint and observes that requests accept a category_id parameter. The user obtains or guesses the numeric ID of the shared drafts category (often a lower number in typical Discourse setups) and sends a crafted onebox request with that category_id. … |
| Remediation | Upgrade Discourse to patched versions 2026.1.3, 2026.2.2, or 2026.3.0 or later, depending on the currently deployed release track. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
More from same product – last 7 days
Information disclosure in Discourse discussion platform allows any MessageBus subscriber to receive real-time chat messa
Path traversal in Discourse's backup download handler allows an authenticated administrator on one site within a multisi
Discourse group owners can retrieve plaintext SMTP credentials - including passwords, usernames, server, port, and SSL m
Whisper channel access control in Discourse can be bypassed by any authenticated forum user, allowing injection of conte
Discourse chat plugin across versions 2026.1.0-2026.4.x contains four authorization deficiencies (CWE-862) enabling both
Share
External POC / Exploit Code
Leaving vuln.today