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CVE-2026-40596· NVD / CVE Program· CNA GitHub_M

MantisBT is vulnerable to XSS and potential account takeover via user font family preference update

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.11.0 through 2.28.1 allow any authenticated user to inject arbitrary HTML by updating their account's font family. Upon exploitation, an XSS payload would be reflected on every MantisBT page. Leveraging another vulnerability (CSP bypass, see GHSA-9c3j-xm6v-j7j3), the attacker could achieve account takeover. This issue has been fixed in version 2.28.2.

HighCVSS 7.2 · v4.0—No exploit Fix available

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Published
May 22, 2026
Updated
Jul 23, 2026
EPSS
0.5% · 40th percentile
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Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.2
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • mantisbt mantisbt

    • >= 2.11.0, < 2.28.2affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Packagistmantisbt/mantisbtfrom 2.11.0 · before 2.28.22.28.2
Packagistmantisbt/mantisbtbefore 2.28.22.28.2

Same product

mantisbt: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-7615MantisBT through 2.3.0 allows arbitrary password reset and unauthenticated admin access via an empty confirm_hash value to verify.php.
    62This week
  • CVE-2014-7146The XmlImportExport plugin in MantisBT 1.2.17 and earlier allows remote attackers to execute arbitrary PHP code via a crafted (1) descriptio
    45Plan
  • CVE-2019-15074The Timeline feature in my_view_page.php in MantisBT through 2.21.1 has a stored cross-site scripting (XSS) vulnerability, allowing executio
    39Monitor
  • CVE-2026-30849MantisBT SOAP API has an authentication bypass vulnerability on MySQL
    38Monitor
  • CVE-2026-47156MantisBT: SOAP API Authentication Bypass with Privilege Escalation to Administrator
    37Monitor
  • CVE-2019-15715MantisBT before 1.3.20 and 2.22.1 allows Post Authentication Command Injection, leading to Remote Code Execution.
    37Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
mantisbt mantisbt2.28.2 · descriptionVendor (CNA)
Packagist:mantisbt/mantisbt2.28.2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-344633 days apartMantisBT has Stored HTML Injection/XSS via Clone Issue Form
    34Monitor
  • CVE-2026-446556 days apartMantisBT: Stored XSS on Move Attachments Admin Page
    34Monitor
  • CVE-2026-3351760 days apartMantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation
    34Monitor
  • CVE-2026-3354860 days apartMantisBT has Stored HTML Injection / XSS when displaying Tags in Timeline
    34Monitor
  • CVE-2026-405970 days apartMantisBT has a Content Security Policy bypass via attachments
    30Monitor
  • CVE-2026-406070 days apartMantisBT is Vulnerable to Stored XSS Through its Saved-Filter Owner Column
    30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
P
Scope
X

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L/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

nvd-secondary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records