Advisory details:
github_osv / GHSA-fvjf-68wh-rwp2
| Advisory ID | github_osv/GHSA-fvjf-68wh-rwp2 |
| Aliases |
CVE-2026-34463
|
| 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 | 0.5 |
| Weighted Severity | 7.7 |
| Risk | 3.9 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv4 | 8.6 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-fvjf-68wh-rwp2/GHSA-fvjf-68wh-rwp2.json |
| generic_textual | HIGH |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| 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 |
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-20T13:36:36Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/34xxx/CVE-2026-34463.json
Source Advisory: vulnrichment/CVE-2026-34463
[{'Exploitation': 'none'},
{'Automatable': 'no'},
{'Technical Impact': 'total'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]