CVE-2018-13879 — A reflected XSS issue was discovered in the registration form in Rocket.Chat before 0.66

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MEDIUM

A reflected XSS issue was discovered in the registration form in Rocket.Chat before 0.66

Published Jul 11, 2018

5.4

MEDIUM

CVSS 3.0

EPSS 0.62%

Description

A reflected XSS issue was discovered in the registration form in Rocket.Chat before 0.66. When one creates an account, the next step will ask for a username. This field will not save HTML control characters but an error will be displayed that shows the attempted username unescaped via packages/rocketchat-ui-login/client/username/username.js in packages/rocketchat-ui-login/client/username/username.html.

Affected products

Remediation

No remediation recorded yet.

Metrics

0.62% 0.00618

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00618

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.62% (0.00618)	47.69th	v5 (v2026.06.15)
Sep 20, 2026	0.62% (0.00618)	48.21th	v5 (v2026.06.15)
Jul 20, 2024	0.05% (0.00054)	23.20th	v3 (v2023.03.01)
Apr 25, 2024	0.05% (0.00054)	21.42th	v3 (v2023.03.01)
Feb 8, 2024	0.05% (0.00053)	18.08th	v3 (v2023.03.01)
Mar 7, 2023	0.05% (0.00054)	20.65th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	0.42% (0.00416)	10.04th	v5 (v2026.06.15)
Apr 14, 2021	0.42% (0.00416)	0.00th	v1