CVE-2026-40607Network attack vector

Stored XSS via unescaped saved-filter owner

Published May 22, 2026 · Updated May 22, 2026

Stored XSS in MantisBT 2.1.0 through 2.28.1 allows remote authenticated users to inject HTML through a public saved-filter owner. The table_print_filter_row() function in manage_filter_page.php writes user_get_name() directly into the owner table cell without HTML escaping. Manager-level access is required by default to save a public filter, and exploitation also requires show_user_realname to be enabled; viewing the filter list executes the stored markup in another user's session.

CVSS severity7.3
High
EPSS probability0.42%
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 2.1.0 through 2.28.1 allows remote authenticated users to inject HTML through a public saved-filter owner. The table_print_filter_row() function in manage_filter_page.php writes user_get_name() directly into the owner table cell without HTML escaping. Manager-level access is required by default to save a public filter, and exploitation also requires show_user_realname to be enabled; viewing the filter list executes the stored markup in another user's session.

The record

CVE
CVE-2026-40607
Published
May 22, 2026
Updated
May 22, 2026
Vendor
MantisBT
Product
MantisBT
Classifications
CWE-79, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 22, 2026CVE publishedPublication date reported by the CVE source.
  2. May 22, 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=>= 2.1.0, < 2.28.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MantisBT · MantisBTversion=>= 2.1.0, < 2.28.2

Published CVSS scores

7.3GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1190Exploit Public-Facing Application

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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