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CVE-2026-59830— Discourse: Stored XSS via unescaped actor name in post actions

Quick assessment

Affected
discourse discourse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could

CVSS 5.4 · Medium EPSS 0.29% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
discourse discourse < 2026.7.0 affected
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I. Basic Information for CVE-2026-59830

Vulnerability Information

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Vulnerability Title
Discourse: Stored XSS via unescaped actor name in post actions
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action descriptions. Viewing the affected user activity streams could execute attacker-controlled script in another user's browser. This issue is fixed in version 2026.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
discourse discourse < 2026.7.0 -

II. Public POCs for CVE-2026-59830

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III. Intelligence Information for CVE-2026-59830

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Patches & Fixes for CVE-2026-59830 (1)

Other References for CVE-2026-59830 (2)

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-79

V. Comments for CVE-2026-59830

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