CVE-2021-42365Network attack vector

Stored XSS via unescaped forum name

Published Nov 29, 2021 · Updated Feb 13, 2025

Stored XSS in Asgaros Forum 1.15.13 and earlier allows remote authenticated users to inject scripts through a crafted forum name. The administration structure table renders the stored name parameter without sufficient output escaping, allowing markup to execute when the entry is viewed. Exploitation requires administrative access and affects multisite installations, or sites where administrators lack unfiltered_html, with execution occurring in another user's browser.

CVSS severity4.8
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Asgaros Forum 1.15.13 and earlier allows remote authenticated users to inject scripts through a crafted forum name. The administration structure table renders the stored name parameter without sufficient output escaping, allowing markup to execute when the entry is viewed. Exploitation requires administrative access and affects multisite installations, or sites where administrators lack unfiltered_html, with execution occurring in another user's browser.

The record

CVE
CVE-2021-42365
Published
Nov 29, 2021
Updated
Feb 13, 2025
Vendor
Asgaros
Product
Asgaros Forum
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.15.13 <=1.15.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Asgaros · Asgaros Forumversion=1.15.13 <=1.15.13

Published CVSS scores

4.8WordfenceCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
2.1NIST NVDAV:N/AC:H/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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