CVE-2021-36841Network attack vector

Authenticated script execution via unescaped newsletter label

Published Sep 27, 2021 · Updated Apr 28, 2026

Stored XSS in YITH Maintenance Mode 1.3.7 and earlier allows remote authenticated users to execute script in an administrator's browser. The newsletter settings path stores the yith_maintenance_newsletter_submit_label value and renders it in an HTML attribute without context-appropriate escaping. Authentication and a later administrator visit to the Newsletter tab are required; the script runs with that browser session's access.

CVSS severity6.9
Medium
EPSS probability0.63%
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 YITH Maintenance Mode 1.3.7 and earlier allows remote authenticated users to execute script in an administrator's browser. The newsletter settings path stores the yith_maintenance_newsletter_submit_label value and renders it in an HTML attribute without context-appropriate escaping. Authentication and a later administrator visit to the Newsletter tab are required; the script runs with that browser session's access.

The record

CVE
CVE-2021-36841
Published
Sep 27, 2021
Updated
Apr 28, 2026
Vendor
YITH
Product
YITH Maintenance Mode
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record 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=<= 1.3.7 <=1.3.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

YITH · YITH Maintenance Modeversion=<= 1.3.7 <=1.3.7

Published CVSS scores

6.9PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
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

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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