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Vulnerability details: VCID-xymn-y9me-kbh9
Vulnerability ID VCID-xymn-y9me-kbh9
Aliases CVE-2026-40607
GHSA-f633-865q-2mhh
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 None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2026-40607
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2026-40607
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2026-40607
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-f633-865q-2mhh
cvssv4 7.5 https://github.com/mantisbt/mantisbt
generic_textual HIGH https://github.com/mantisbt/mantisbt
cvssv4 7.5 https://github.com/mantisbt/mantisbt/commit/44f490bcf20fd491c1b8f3fc9dd041d8c2a30010
generic_textual HIGH https://github.com/mantisbt/mantisbt/commit/44f490bcf20fd491c1b8f3fc9dd041d8c2a30010
ssvc Track https://github.com/mantisbt/mantisbt/commit/44f490bcf20fd491c1b8f3fc9dd041d8c2a30010
cvssv3.1_qr HIGH https://github.com/mantisbt/mantisbt/security/advisories/GHSA-f633-865q-2mhh
cvssv4 7.5 https://github.com/mantisbt/mantisbt/security/advisories/GHSA-f633-865q-2mhh
generic_textual HIGH https://github.com/mantisbt/mantisbt/security/advisories/GHSA-f633-865q-2mhh
ssvc Track https://github.com/mantisbt/mantisbt/security/advisories/GHSA-f633-865q-2mhh
cvssv4 7.5 https://mantisbt.org/bugs/view.php?id=37015
generic_textual HIGH https://mantisbt.org/bugs/view.php?id=37015
ssvc Track https://mantisbt.org/bugs/view.php?id=37015
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-40607
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
GHSA-f633-865q-2mhh https://github.com/advisories/GHSA-f633-865q-2mhh
No exploits are available.
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/mantisbt/mantisbt
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)

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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/mantisbt/mantisbt/commit/44f490bcf20fd491c1b8f3fc9dd041d8c2a30010
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)

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-26T18:51:03Z/ Found at https://github.com/mantisbt/mantisbt/commit/44f490bcf20fd491c1b8f3fc9dd041d8c2a30010
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/mantisbt/mantisbt/security/advisories/GHSA-f633-865q-2mhh
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

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physical

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present

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passive

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-26T18:51:03Z/ Found at https://github.com/mantisbt/mantisbt/security/advisories/GHSA-f633-865q-2mhh
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://mantisbt.org/bugs/view.php?id=37015
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

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present

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passive

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-26T18:51:03Z/ Found at https://mantisbt.org/bugs/view.php?id=37015
Exploit Prediction Scoring System (EPSS)
Percentile 0.17138
EPSS Score 0.00054
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T17:03:52.131196+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-f633-865q-2mhh/GHSA-f633-865q-2mhh.json 38.6.0