How severe is CVE-2018-13879?

CVE-2018-13879 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-13879 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-13879?

CVE-2018-13879 affects Rocket.chat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-13879?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-13879 published?

CVE-2018-13879 was published on 2018-07-11 and last updated on 2026-06-17.

CVE-2018-13879

CVE-2018-13879 is a medium-severity vulnerability in Rocket.chat with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Rocket.chat
Published: 2018-07-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2018-13879?: 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.
How severe is CVE-2018-13879?: CVE-2018-13879 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-13879 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-13879?: CVE-2018-13879 affects Rocket.chat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-13879?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-13879 published?: CVE-2018-13879 was published on 2018-07-11 and last updated on 2026-06-17.

References

https://github.com/RocketChat/Rocket.Chat/issues/10795

Affected products (1)

cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*

More vulnerabilities in Rocket.chat

CVE-2026-29198 — Critical (CVSS 9.8): In Rocket.Chat <8.3.0, <8.2.1, <8.1.2, <8.0.3, <7.13.5, <7.12.6, <7.11.6, and <7.10.9, a NoSQL injection vulnerability…
CVE-2026-30831 — Critical (CVSS 9.8): Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to versions 7.10.8, 7.11.5,…
CVE-2026-28514 — Critical (CVSS 9.8): Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to versions 7.8.6, 7.9.8,…
CVE-2023-28316 — Critical (CVSS 9.8): A security vulnerability has been discovered in the implementation of 2FA on the rocket.chat platform, where other…
CVE-2022-44567 — Critical (CVSS 9.8): A command injection vulnerability exists in Rocket.Chat-Desktop <3.8.14 that could allow an attacker to pass a…
CVE-2021-22910 — Critical (CVSS 9.8): A sanitization vulnerability exists in Rocket.Chat server versions <3.13.2, <3.12.4, <3.11.4 that allowed queries to an…

All CVEs affecting Rocket.chat →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →