CVE-2026-30048Public exploitNetwork attack vector

Stored XSS via unsanitized chat history rendering

Published Mar 18, 2026 · Updated Mar 18, 2026

Stored XSS in NotChatbot WebChat 1.5.0 and earlier allows remote attackers to execute JavaScript via crafted chat messages. The conversation-history renderer stores message input and later inserts it into the page without output encoding or HTML sanitization. Execution occurs when a user reloads or reopens the affected conversation, exposing browser-accessible data and actions to the injected script.

CVSS severity5.3
Medium
EPSS probability0.25%
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 NotChatbot WebChat 1.5.0 and earlier allows remote attackers to execute JavaScript via crafted chat messages. The conversation-history renderer stores message input and later inserts it into the page without output encoding or HTML sanitization. Execution occurs when a user reloads or reopens the affected conversation, exposing browser-accessible data and actions to the injected script.

The record

CVE
CVE-2026-30048
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

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

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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