CVE-2023-49802Network attack vector

Stored XSS via misencoded linked-field values

Published Dec 11, 2023 · Updated Aug 28, 2024

Stored XSS in MantisBT LinkedCustomFields before 2.0.1 allows remote authenticated users to run JavaScript via crafted field values. JavascriptUtils::toJSArray places string_attribute output inside a hand-built, double-quoted JavaScript array instead of JSON-encoding the values. High-privilege custom-field access is required to store the payload, which executes when a linked field appears on a new-issue or edit form.

CVSS severity6.7
Medium
EPSS probability0.66%
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 MantisBT LinkedCustomFields before 2.0.1 allows remote authenticated users to run JavaScript via crafted field values. JavascriptUtils::toJSArray places string_attribute output inside a hand-built, double-quoted JavaScript array instead of JSON-encoding the values. High-privilege custom-field access is required to store the payload, which executes when a linked field appears on a new-issue or edit form.

The record

CVE
CVE-2023-49802
Published
Dec 11, 2023
Updated
Aug 28, 2024
Vendor
MantisBT
Product
LinkedCustomFields
Classifications
CWE-80, CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2024Record 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=< 2.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MantisBT · LinkedCustomFieldsversion=< 2.0.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L

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-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
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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