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Description

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a malicious second factor name on an attacker-controlled account was not escaped in the delete confirmation dialog, allowing stored cross-site scripting when an administrator impersonated that account. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

PUBLISHED Reserved 2026-06-11 | Published 2026-07-09 | Updated 2026-07-14 | Assigner GitHub_M




HIGH: 7.3CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

>= 2026.1.0-latest, < 2026.1.5
affected

>= 2026.4.0-latest, < 2026.4.2
affected

>= 2026.5.0-latest, < 2026.5.1
affected

References

github.com/...course/security/advisories/GHSA-wg5x-7f23-m3r5

github.com/...ommit/40de62cddadc65c328a1028ab999f3fa94adbfed

github.com/...ommit/529e17d4d570a48972e7cf64720e5dd1fdf23ca8

github.com/...ommit/d92973e51a46cf6dd20c71e6068e6769b67eea5b

github.com/...ommit/daea5214d833eacbdd3b1a78d99eb14e9cabd915

github.com/discourse/discourse/releases/tag/v2026.1.5

github.com/discourse/discourse/releases/tag/v2026.4.2

github.com/discourse/discourse/releases/tag/v2026.5.1

github.com/discourse/discourse/releases/tag/v2026.6.0

cve.org (CVE-2026-53963)

nvd.nist.gov (CVE-2026-53963)

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