CVE-2023-24540

Improper handling of JavaScript whitespace in html/template

Critical · published May 11, 2023

CVSS v3.1
9.8
EPSS
2%
Percentile
75.0
In the wild
Unconfirmed
What it is

🔥 A peculiar twist in JavaScript's whitespace handling has emerged! Not all valid whitespace characters are cleaned up properly during template execution, leaving doors open for sneaky exploits. Think of it like a restaurant that only checks for main ingredients but ignores some sneaky garnishes that could be harmful. Just because a dish looks good doesn’t mean it’s safe to serve – similar to how this vulnerability lets potentially problematic whitespace slip through the cracks. An attacker can leverage this flaw to inject malicious code into templates, which could lead to disastrous consequences like data leaks or unauthorized actions. This exploit could jeopardize the integrity of your entire application, rendering it vulnerable to various attacks!

Put simply

Think of it like a restaurant that only checks for main ingredients but ignores some sneaky garnishes that could be harmful. Just because a dish looks good doesn’t mean it’s safe to serve – similar to how this vulnerability lets potentially problematic whitespace slip through the cracks. This vulnerability occurs because certain valid JavaScript whitespace characters are not properly sanitized during template execution. If the context involves actions, this can lead to unexpected behavior and possible code execution.

What to do

An attacker can leverage this flaw to inject malicious code into templates, which could lead to disastrous consequences like data leaks or unauthorized actions. This exploit could jeopardize the integrity of your entire application, rendering it vulnerable to various attacks! Update to the patched version as soon as it becomes available. Review and sanitize input data thoroughly, ensuring that all whitespace characters are accounted for in templates to prevent injection risks. This is fixable! Stay vigilant, and you'll have your defenses up in no time! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01560 · 75.0th percentile
Published
2023-05-11T15:29Z
EPSS history
Timeline
  • 11 MAY 15:29Z
    Improper handling of JavaScript whitespace in html/template
    cvelistv5