VulnSocial

CVE-2026-21865Disclosure(discourse / discourse)

LOWCVSS 6.5 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a workaround, site admin can temporarily revoke the moderation role from untrusted moderators or remove the moderator group from the "personal message enabled groups" site setting until the Discourse instance has been upgraded to a version that has been patched.

discourse CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-862

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • discourse

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-01-28); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
discourse
Products
discourse

2 versions affected across 1 product

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-01-28: 1Mentions · 2026-01-29: 101-2801-29
Signal classification1 categories
Disclosure
2100.0%
Referenced assets3 URLs
Full discourse2 posts
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-21865 Discourse Unauthorized Message Conversion Vulnerability in Versio... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-21865 Customizable Vulnerability Alerts: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=4

    Post summary

    The tweet announces CVE-2026-21865 as a Discourse unauthorized message conversion vulnerability and provides a link to a vulnerability details page, but offers no technical, exploit, or patch information.

    0000064
    4.0K followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-21865 Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to publ… https://www.cve.org/CVERecord?id=CVE-2026-21865

    Post summary

    The excerpt announces CVE‑2026‑21865, noting a flaw in earlier Discourse versions that lets moderators convert personal messages to public, but offers no exploitation details, fixes, or verification of active attacks.

    00000203
    56.5K followersView on X
CPE platform detail3 entries

3 of 3 entries

PartVendorProductVersionTarget SWTarget HW
Appdiscoursediscourse---
Appdiscoursediscourse2025.12.0--
Appdiscoursediscourse2026.1.0--

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