CVE-2026-53963

HIGH 7.3

Discourse: Stored-XSS in 2FA delete confirmation modal

CVSS Score

7.3

EPSS Score

0.4%

EPSS Percentile

31th

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.

CWE	CWE-79
Vendor	discourse
Product	discourse
Published	Jul 9, 2026
Last Updated	Jul 14, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

discourse / discourse

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

References

NVD ↗ CVE.org ↗ EPSS Data ↗