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Vulnerability details: VCID-hjug-mc57-nyaf
Vulnerability ID VCID-hjug-mc57-nyaf
Aliases CVE-2026-34463
GHSA-fvjf-68wh-rwp2
Summary MantisBT is Vulnerable to Stored HTML Injection/XSS in Clone Issue Form 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). ### Impact Cross-site scripting (XSS). This is mitigated by Content Security Policy which restricts scripts execution. ### Patches - df22697ae497ddd93f3d9132fdf4979db8d081cd ### Workarounds Make sure Project names do not contain any HTML tags. ### Credits Thanks to Vishal Shukla for discovering and responsibly reporting the issue. The vulnerability was also identified and independently reported by @siunam321 (Tang Cheuk Hei), prior to this Advisory's publication.
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 0.00017 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://github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2
https://mantisbt.org/bugs/view.php?id=36986
https://nvd.nist.gov/vuln/detail/CVE-2026-34463
GHSA-fvjf-68wh-rwp2 https://github.com/advisories/GHSA-fvjf-68wh-rwp2
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)

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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

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physical

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present

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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

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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)

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adjacent

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physical

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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://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

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Exploit Prediction Scoring System (EPSS)
Percentile 0.04523
EPSS Score 0.00017
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T17:00:37.928084+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-fvjf-68wh-rwp2/GHSA-fvjf-68wh-rwp2.json 38.6.0