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CVE-2026-40607

MantisBT is Vulnerable to Stored XSS Through its Saved-Filter Owner Column

7.5 HighFix available

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.11.0 through 2.28.1, a Stored XSS vulnerability is caused by incorrect escaping of a saved filter's owner, allowing an attacker to inject arbitrary HTML on systems where $g_show_user_realname = ON. Note that By default, only users with Manager access level or above can save their filters publicly. This issue has been fixed in version 2.28.2. If developers are unable to update immediately, they can work around this issue by preventing display of users' real names (set $g_ show_user_realname = OFF; in configuration), and restricting the ability to store filters (set $g_stored_query_create_threshold / $g_stored_query_create_shared_threshold to NOBODY).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
High
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
Low

Exploit likelihood

0.42%Up 0.4 points since May 23, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

MantisBT is Vulnerable to Stored XSS Through its Saved-Filter Owner Column

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.11.0 through 2.28.1, a Stored XSS vulnerability is caused by incorrect escaping of a saved filter's owner, allowing an attacker to inject arbitrary HTML on systems where $g_show_user_realname = ON. Note that By default, only users with Manager access level or above can save their filters publicly. This issue has been fixed in version 2.28.2. If developers are unable to update immediately, they can work around this issue by preventing display of users' real names (set $g_ show_user_realname = OFF; in configuration), and restricting the ability to store filters (set $g_stored_query_create_threshold / $g_stored_query_create_shared_threshold to NOBODY).

Record
CVE-2026-40607
CVSS 4.0
7.5 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2026-31495 7.5

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.11.0 through 2.28.1, a Stored XSS vulnerability is caused by incorrect escaping of a saved filter's owner, allowing an attacker to inject arbitrary HTML on systems where $g_show_user_realname = ON. Note that By default, only users with Manager access level or above can save their filters publicly. This issue has been fixed in version 2.28.2. If developers are unable to update immediately, they can work around this issue by preventing display of users' real names (set $g_ show_user_realname = OFF; in configuration), and restricting the ability to store filters (set $g_stored_query_create_threshold / $g_stored_query_create_shared_threshold to NOBODY).

Record
EUVD-2026-31495
CVSS 4.0
7.5 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-f633-865q-2mhh 7.5

MantisBT is Vulnerable to Stored XSS in Saved-Filter Owner Column

Incorrect escaping of a saved filter's owner allows an attacker to inject arbitrary HTML on systems where $g_show_user_realname = ON.

Impact

Cross-site scripting (XSS).

Note that By default, only users with Manager access level or above can save their filters publicly

Patches

  • 44f490bcf20fd491c1b8f3fc9dd041d8c2a30010

Workarounds

  • Prevent display of users' real name (set $g_ show_user_realname = OFF; in configuration)
  • Restrict ability to store filters (set $g_stored_query_create_threshold / $g_stored_query_create_shared_threshold to NOBODY

Credits

Thanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.

Record
GHSA-f633-865q-2mhh
CVSS 4.0
7.5 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02
NVD 7.5

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.11.0 through 2.28.1, a Stored XSS vulnerability is caused by incorrect escaping of a saved filter's owner, allowing an attacker to inject arbitrary HTML on systems where $g_show_user_realname = ON. Note that By default, only users with Manager access level or above can save their filters publicly. This issue has been fixed in version 2.28.2. If developers are unable to update immediately, they can work around this issue by preventing display of users' real names (set $g_ show_user_realname = OFF; in configuration), and restricting the ability to store filters (set $g_stored_query_create_threshold / $g_stored_query_create_shared_threshold to NOBODY).

Record
CVE-2026-40607
CVSS 4.0
7.5 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-79
Updated
2026-11-02
OSV 7.5

MantisBT is Vulnerable to Stored XSS Through its Saved-Filter Owner Column

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.11.0 through 2.28.1, a Stored XSS vulnerability is caused by incorrect escaping of a saved filter's owner, allowing an attacker to inject arbitrary HTML on systems where $g_show_user_realname = ON. Note that By default, only users with Manager access level or above can save their filters publicly. This issue has been fixed in version 2.28.2. If developers are unable to update immediately, they can work around this issue by preventing display of users' real names (set $g_ show_user_realname = OFF; in configuration), and restricting the ability to store filters (set $g_stored_query_create_threshold / $g_stored_query_create_shared_threshold to NOBODY).

Record
CVE-2026-40607
CVSS 4.0
7.5 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02
OSVGHSA-f633-865q-2mhh 7.5

MantisBT is Vulnerable to Stored XSS in Saved-Filter Owner Column

Incorrect escaping of a saved filter's owner allows an attacker to inject arbitrary HTML on systems where $g_show_user_realname = ON.

Impact

Cross-site scripting (XSS).

Note that By default, only users with Manager access level or above can save their filters publicly

Patches

  • 44f490bcf20fd491c1b8f3fc9dd041d8c2a30010

Workarounds

  • Prevent display of users' real name (set $g_ show_user_realname = OFF; in configuration)
  • Restrict ability to store filters (set $g_stored_query_create_threshold / $g_stored_query_create_shared_threshold to NOBODY

Credits

Thanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.

Record
GHSA-f633-865q-2mhh
CVSS 4.0
7.5 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mantisbt/mantisbt
Packagist
 2.1.0 to 2.28.1
2.28.2
mantisbt/mantisbt
Packagist
 2.1.0 up to 2.28.2, plus listed versions
2.10.02.10.12.11.02.11.12.12.0
Show 45 moreShow less
2.12.12.12.22.13.02.13.12.13.22.14.02.15.02.15.12.16.02.16.12.17.02.17.12.17.22.18.02.18.12.19.02.19.12.20.02.20.12.21.02.21.12.21.22.21.32.22.02.22.12.22.22.23.02.23.12.24.02.24.12.24.22.24.32.24.42.24.52.25.02.25.12.25.22.25.32.25.42.25.52.25.62.25.72.25.82.26.02.26.1
2.28.2

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-40607 is a high vulnerability (CVSS 7.5) in Mantisbt, published May 11, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.42%, the 36th percentile. Fixed in mantisbt/mantisbt 2.28.2.

References

This page doesn't list everything

Left out here: 26 versions. The JSON record has them.

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