CVE-2023-33962Public exploitNetwork attack vector

Cross-site scripting via unescaped single quotes

Published May 30, 2023 · Updated Jan 10, 2025

Cross-site scripting in JStachio before 1.0.1 allows attackers to execute JavaScript in other users' browsers via crafted template data. HtmlEscaper passes single quotes in interpolated values through unchanged, so a value can terminate a single-quoted HTML attribute and inject an event handler. Exploitation requires an application to place attacker-controlled data in such an attribute and another user to render the resulting page; impact is limited to that browser context.

CVSS severity5.4
Medium
EPSS probability0.58%
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 JStachio before 1.0.1 allows attackers to execute JavaScript in other users' browsers via crafted template data. HtmlEscaper passes single quotes in interpolated values through unchanged, so a value can terminate a single-quoted HTML attribute and inject an event handler. Exploitation requires an application to place attacker-controlled data in such an attribute and another user to render the resulting page; impact is limited to that browser context.

The record

CVE
CVE-2023-33962
Published
May 30, 2023
Updated
Jan 10, 2025
Vendor
JStachio
Product
JStachio
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. May 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 10, 2025Record 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=< 1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

JStachio · JStachioversion=< 1.0.1

Published CVSS scores

5.4GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.1NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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
PrivilegesUnavailable
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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