CVE-2024-27083Network attack vector

Browser script execution via unescaped next parameter

Published Feb 28, 2024 · Updated Aug 8, 2024

Cross-site scripting in Flask-AppBuilder 4.1.4 through 4.2.0 allows remote attackers to execute JavaScript via an OAuth login URL. The login_oauth.html template applies Jinja's safe filter to the next query parameter before embedding it in JavaScript, suppressing HTML escaping. Exploitation requires OAuth authentication to be enabled and a user to follow the crafted URL; successful code runs in that user's browser.

CVSS severity4.3
Medium
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Flask-AppBuilder 4.1.4 through 4.2.0 allows remote attackers to execute JavaScript via an OAuth login URL. The login_oauth.html template applies Jinja's safe filter to the next query parameter before embedding it in JavaScript, suppressing HTML escaping. Exploitation requires OAuth authentication to be enabled and a user to follow the crafted URL; successful code runs in that user's browser.

The record

CVE
CVE-2024-27083
Published
Feb 28, 2024
Updated
Aug 8, 2024
Vendor
dpgaspar
Product
Flask-AppBuilder
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 8, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 4.1.4, < 4.2.1
  2. Affected versionversion=4.1.4 <4.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

dpgaspar · Flask-AppBuilderversion=>= 4.1.4, < 4.2.1; version=4.1.4 <4.2.1

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

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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