Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-f633-865q-2mhh
Advisory ID github_osv/GHSA-f633-865q-2mhh
Aliases CVE-2026-40607
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
cvssv4 7.5 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-f633-865q-2mhh/GHSA-f633-865q-2mhh.json
generic_textual HIGH
Reference id Reference type URL
https://github.com/mantisbt/mantisbt
https://github.com/mantisbt/mantisbt/commit/44f490bcf20fd491c1b8f3fc9dd041d8c2a30010
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-f633-865q-2mhh
https://mantisbt.org/bugs/view.php?id=37015
CVE-2026-40607 https://nvd.nist.gov/vuln/detail/CVE-2026-40607
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-f633-865q-2mhh/GHSA-f633-865q-2mhh.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.