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PatchSiren cyber security CVE debrief

CVE-2026-44785 discourse CVE debrief

CVE-2026-44785 is a vulnerability in the Discourse open-source discussion platform. The AI 'explain' helper only checks can_see? on the post being explained, not its reply_to_post. This allows any authenticated user with access to the AI helper to read the raw contents of a hidden parent post by invoking 'Explain' on a reply to it. The affected versions are from 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1. The issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.

Vendor
discourse
Product
Unknown
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-17
Advisory published
2026-06-12
Advisory updated
2026-06-17

Who should care

Users of Discourse, specifically those with authenticated access to the AI helper, should be aware of this vulnerability and take steps to update to a patched version.

Technical summary

The vulnerability has a CVSS score of 4.3 and a severity of MEDIUM. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N. The weakness is classified as CWE-200.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update to a patched version of Discourse (2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1) to prevent exploitation of this vulnerability.

Evidence notes

The vulnerability was published on June 12, 2026, and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-44785 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-44785

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-44785 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-44785

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.