CVE-2026-44785 | Discourse: Hidden reply-to post raw can be disclosed through AI explain prompts

Discourse is an open-source discussion platform. From versions 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 AI "explain" helper only checks can_see? on the post being explained, not its reply_to_post, so any authenticated user with access to the AI helper could read the raw contents of a hidden parent post by invoking "Explain" on a reply to it. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.

Published: 2026-06-12 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-44785 is rated Low Risk (19.9/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.18%). Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-44785

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.03% 0.18% +0.15%
2 2026-06-12 — 0.03% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-44785

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 1.4 [email protected]

Weakness enumeration for CVE-2026-44785

Affected software / configurations for CVE-2026-44785

Vendor Product Version Raw CPE
discourse discourse < 2026.1.0 cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
discourse discourse >= 2026.1.0, < 2026.1.4 cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
discourse discourse >= 2026.3.0, < 2026.3.1 cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
discourse discourse >= 2026.4.0, < 2026.4.1 cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
discourse discourse 2026.5.0 cpe:2.3:a:discourse:discourse:2026.5.0:*:*:*:latest:*:*:*

References for CVE-2026-44785

cvelogic Threat Intelligence