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CVE-2026-49256

Discourse: Hidden tag names leaked via category serializers

Medium6.3EPSS 0.51%
Published
Updated
Reserved
Assigned by
GitHub_M

Description

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, restricted tag and tag-group names attached to publicly readable categories as allowed_tags, allowed_tag_groups, or required tag groups could leak to anonymous and unauthorized users through category and group endpoints. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

Scores

CVSS scores of CVE-2026-49256, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)4.0Medium6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
NVDNVD · Analyzed4.0Medium6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.51% · top 56% 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 6.3.

Weakness

Affected products

  • discourse · discourse

    • affected >= 2026.1.0-latest, < 2026.1.5
    • affected >= 2026.4.0-latest, < 2026.4.2
    • affected >= 2026.5.0-latest, < 2026.5.1

References (5)

Sources

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

Badge for a README or a ticket

CVE-2026-49256 badge
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Record last updated .