Is CVE-2026-34463 actively exploited?

No active exploitation of CVE-2026-34463 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34463 be exploited remotely?

Yes. CVE-2026-34463 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34463?

CVE-2026-34463 has a CVSS score of 8.6 (HIGH).

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HIGH

CVE-2026-34463

CWE-79Published: May 19, 2026· Updated: May 20, 2026

8.6

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:4.6th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-34463 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.High

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X