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Vulnerability details: VCID-njtb-g25z-u3e1
Vulnerability ID VCID-njtb-g25z-u3e1
Aliases CVE-2026-34463
GHSA-fvjf-68wh-rwp2
Summary Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior contain a Stored XSS vulnerability. When cloning an issue originating from a Project other than the current one, the clone form (bug_report_page.php) prepends the source Project name before the category selector without proper escaping, allowing an attacker able to to inject HTML if they can set the Project's name (which typically requires manager or administrator access level). This issue has been resolved in version 2.28.2.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00017 https://api.first.org/data/v1/epss?cve=CVE-2026-34463
epss 0.00017 https://api.first.org/data/v1/epss?cve=CVE-2026-34463
epss 0.00017 https://api.first.org/data/v1/epss?cve=CVE-2026-34463
epss 0.00017 https://api.first.org/data/v1/epss?cve=CVE-2026-34463
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-fvjf-68wh-rwp2
cvssv4 8.6 https://github.com/mantisbt/mantisbt
generic_textual HIGH https://github.com/mantisbt/mantisbt
cvssv4 8.6 https://github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd
generic_textual HIGH https://github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd
ssvc Track https://github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd
cvssv3.1_qr HIGH https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2
cvssv4 8.6 https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2
generic_textual HIGH https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2
ssvc Track https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2
cvssv4 8.6 https://mantisbt.org/bugs/view.php?id=36986
generic_textual HIGH https://mantisbt.org/bugs/view.php?id=36986
ssvc Track https://mantisbt.org/bugs/view.php?id=36986
cvssv4 8.6 https://nvd.nist.gov/vuln/detail/CVE-2026-34463
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-34463
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-34463
https://github.com/mantisbt/mantisbt
https://nvd.nist.gov/vuln/detail/CVE-2026-34463
df22697ae497ddd93f3d9132fdf4979db8d081cd https://github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd
GHSA-fvjf-68wh-rwp2 https://github.com/advisories/GHSA-fvjf-68wh-rwp2
GHSA-fvjf-68wh-rwp2 https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2
view.php?id=36986 https://mantisbt.org/bugs/view.php?id=36986
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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)

network

adjacent

local

physical

low

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passive

active

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd
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

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low

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-20T13:36:36Z/ Found at https://github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2
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

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-20T13:36:36Z/ Found at https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://mantisbt.org/bugs/view.php?id=36986
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

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low

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none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-20T13:36:36Z/ Found at https://mantisbt.org/bugs/view.php?id=36986
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-34463
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

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low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.04518
EPSS Score 0.00017
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:47:17.447812+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/34xxx/CVE-2026-34463.json 38.6.0