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CVE-2026-55704

Discourse: Shared-draft titles and excerpts leak through group post serialization

Medium4.3EPSS 0.27%
Published
Updated
Reserved
Assigned by
GitHub_M

Description

Discourse is an open-source discussion platform. Prior o 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, users who were allowed to view a group’s activity, but were not permitted to see shared drafts, could still receive shared-draft entries through the group posts and group mentions endpoints. This could disclose shared-draft topic titles and post excerpt/content, resulting in an information disclosure of unpublished draft material. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Scores

CVSS scores of CVE-2026-55704, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)3.1Medium4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVDNVD · Deferred3.1Medium4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS (exploitation in 30 days)
0.27% · top 81% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.

Weakness

Affected products

  • discourse · discourse

    • affected < 2026.1.6
    • affected >= 2026.5.0-latest, < 2026.5.2
    • affected >= 2026.6.0-latest, < 2026.6.1

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .