CVE-2023-49276Public exploitNetwork attack vector

Stored XSS via unescaped analytics identifier

Published Dec 1, 2023 · Updated Aug 2, 2024

Stored XSS in Uptime Kuma 1.20.0 through 1.23.6 allows remote authenticated users to run scripts in a status-page visitor's browser. The getGoogleAnalyticsScript function inserts the status page's attacker-controlled tagId into a double-quoted script src attribute after escaping only for JavaScript context. Status-page configuration access is required to save the payload, and code executes only when another user opens the affected page.

CVSS severity6.1
Medium
EPSS probability0.50%
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 Uptime Kuma 1.20.0 through 1.23.6 allows remote authenticated users to run scripts in a status-page visitor's browser. The getGoogleAnalyticsScript function inserts the status page's attacker-controlled tagId into a double-quoted script src attribute after escaping only for JavaScript context. Status-page configuration access is required to save the payload, and code executes only when another user opens the affected page.

The record

CVE
CVE-2023-49276
Published
Dec 1, 2023
Updated
Aug 2, 2024
Vendor
Louis Lam
Product
Uptime Kuma
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=>= 1.20.0, < 1.23.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Louis Lam · Uptime Kumaversion=>= 1.20.0, < 1.23.7

Published CVSS scores

6.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

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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