MantisBT has Stored XSS on Move Attachments Admin Page
Unescaped Project Name allows an attacker that can set it (which typically requires manager or administrator access level) to inject HTML in Move Attachments admin page. ### Impact Cross-site scripting (XSS). This is mitigated by Content Security Policy which restricts scripts execution. ### Patches - 5cb4b469295889f5d2b01677c9bf82c143e0fdaa ### Wo...
CVSS 7.5 LOW. SENTINEL APEX recommends immediate patch evaluation. Intelligence from 1 confirmed source(s).
📋 Executive Summary
This report analyzes CVE-2026-44655 affecting composer mantisbt/mantisbt. Composite threat score: 44/100. Intelligence corroborated across 1 source(s): github_advisories. CVSS base score: 7.5. No confirmed in-the-wild exploitation at the time of writing; prioritize on exposure, privilege, and CVSS.
⚠️ Business Impact Analysis
- ⚠️ composer mantisbt/mantisbt users face material security risk requiring immediate remediation
🔗 Representative Attack Path
A typical attack path for this vulnerability class, mapped to MITRE ATT&CK — a representative model to guide detection and defense, not a claim of observed activity against a specific target. Confirm specifics against the primary sources below.
| # | Phase | Attacker Action | MITRE |
|---|---|---|---|
1 |
Reconnaissance | Attacker identifies exposed mantisbt/mantisbt instances via Shodan, Censys, or targeted scanning | TA0043 |
2 |
Initial Access | Spear-phishing with malicious attachment or link targeting the affected vendor’s users | T1566 |
3 |
Persistence | Backdoor, scheduled task, or new admin account created for persistent access | T1053 |
4 |
Command & Control | Attacker establishes persistent C2 channel using HTTPS or DNS tunneling | T1071 |
5 |
Impact / Objectives | Intellectual property theft, espionage, cryptomining, or preparation for future attack stage | T1657 |
⚠ Deep Dive Analysis
This high-severity vulnerability in composer mantisbt/mantisbt (CVSS 7.5) represents a significant attack surface. SENTINEL APEX assesses exploitation to be technically feasible with moderate effort. Organizations running mantisbt/mantisbt in internet-facing or privileged positions face immediate risk.
SENTINEL APEX URGENCY: ELEVATED. Score: 44/100 LOW. Patch before exploitation activity begins.
🎯 MITRE ATT&CK Mapping
| Category | Mapping |
|---|---|
| Primary Tactic | Initial Access |
| Primary Technique | T1190 — Exploit Public-Facing Application |
| Sub-Technique | T1203 — Exploitation for Client Execution |
| Weakness (CWE) | CWE-79 |
| Intel Type | 🔴 CVE ANALYSIS |
| Source(s) | github_advisories |
🔴 CVE Reference
| CVE ID | Reference | Score |
|---|---|---|
| CVE-2026-44655 | NVD → | 7.5 |
| CVE-2026-44655 | NVD → | 7.5 |
🏷️ Indicators of Compromise — Enriched IOC Feed
Normalized IOCs with confidence scoring. Block immediately across all enforcement points. SOC Pro subscribers receive enriched IOC bundles with full attribution and STIX/TAXII feeds.
| Indicator Value | Type | Confidence | First Seen |
|---|---|---|---|
| 5cb4b469295889f5d2b01677c9bf82c143e0fdaa | sha1 | 90% | 2026-05-11 |
🔍 Detection Rules — Sigma (SIEM)
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📡 Detection Rules — YARA (Endpoint)
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🛡️ SOC Response Playbook
- 1IMMEDIATE (0-1hr): Identify all instances of mantisbt/mantisbt in your environment via CMDB/asset inventory
- 2IMMEDIATE: Block all 1 IOCs in this report at firewall, proxy, DNS, and EDR simultaneously
- 3IMMEDIATE (0-1hr): Apply vendor patch — no maintenance window exception for LOW threats
- 4IMMEDIATE (1-2hr): If no patch available: implement WAF rules, ACLs, or network-level compensating controls
- 5SHORT-TERM (2-4hr): Deploy Sigma detection rule to SIEM — validate alert generation in test environment
- 6SHORT-TERM (4-8hr): Review logs for exploitation indicators (anomalous mantisbt/mantisbt requests, error spikes)
- 7SHORT-TERM (8-24hr): Hunt for post-exploitation: new admin accounts, scheduled tasks, lateral movement
- 8MONITOR: Subscribe to composer security advisories for patch updates
- 9ONGOING: Track SENTINEL APEX intelligence feed for follow-on campaigns targeting mantisbt/mantisbt
📎 Intelligence References
- github.com/advisories/GHSA-7mqj-8gj2-cg59
- github.com/mantisbt/mantisbt/security/advisories/GHSA-7mqj-8gj2-cg59
- github.com/mantisbt/mantisbt/commit/5cb4b469295889f5d2b01677c9bf82c143
- mantisbt.org/bugs/view.php?id=37099
- github.com/advisories/GHSA-7mqj-8gj2-cg59
- 📌 NVD — CVE-2026-44655
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Report ID: SENTINEL-CVE-2026-44655-2026-05-11 | Priority: 44/100 LOW | Sources: 1
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