CVE-2026-49391Network attack vectorHinoki check available

Stored XSS via unescaped import column headers

Published Aug 6, 2026 · Updated Aug 6, 2026

Stored XSS in Frappe Framework before 15.109.0 and 16.0.0-beta.1 through 16.18.x allows remote authenticated users to run scripts. Data Import inserts header_title values into preview labels and warning messages without HTML escaping; the patch applies escape_html at each render site. An authenticated user with Data Import access must upload a crafted column header, and execution occurs when another user opens the preview or results interface.

CVSS severity5.1
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in Frappe Framework before 15.109.0 and 16.0.0-beta.1 through 16.18.x allows remote authenticated users to run scripts. Data Import inserts header_title values into preview labels and warning messages without HTML escaping; the patch applies escape_html at each render site. An authenticated user with Data Import access must upload a crafted column header, and execution occurs when another user opens the preview or results interface.

The record

CVE
CVE-2026-49391
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
Frappe Technologies Pvt. Ltd.
Product
Frappe Framework
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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=< 15.109.0
  2. Affected versionversion=>= 16.0.0-beta.1, < 16.19.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Frappe Technologies Pvt. Ltd. · Frappe Frameworkversion=< 15.109.0; version=>= 16.0.0-beta.1, < 16.19.0

Published CVSS scores

5.1GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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