CVE-2026-52847

CRITICALPre-NVD 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: —CVSS: —Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

MantisBT: Reflected XSS in admin/install.php

MantisBT 2.28.3 and earlier contains six reflected XSS injection points in /admin/install.php. User-supplied parameters are echoed into HTML without escaping via print_test_result(). No authentication is required.

A Content Security Policy (script-src 'self') prevents inline JavaScript execution, but the CSP is missing a form-action directive, allowing exploitation via credential-phishing form injection and open redirects.

Impact

  • Credential phishing: Attacker crafts a URL that renders a fake login form on the real MantisBT admin page. Admin credentials are submitted to an attacker-controlled server.
  • Open redirect: Victim is silently redirected to a phishing or malware site.
  • UI manipulation: CSS injection can hide legitimate page content and overlay attacker-controlled HTML, enabling social engineering.

Patches

  • https://github.com/mantisbt/mantisbt/commit/0f32ceabadc745239754962df91a51d5d51e3fd7
  • https://github.com/mantisbt/mantisbt/commit/f2191a0d8ce438bf74171d496cf721dae025a5c0

Workarounds

Remove the /admin directory, as recommended in the Admin Guide

Resources

Credits

McCaulay Hudson (@_McCaulay) of watchTowr

CVSS v3
—
EG Score
0.0(none)
EPSS
—
KEV
Not listed

Published

July 15, 2026

Last Modified

July 15, 2026

Vendor Advisories for CVE-2026-52847(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 1× in last 7d / 1× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 18:54 UTCEG score recompute

Frequently asked(3)

What is CVE-2026-52847?
CVE-2026-52847 is a critical vulnerability published on July 15, 2026. MantisBT: Reflected XSS in admin/install.php MantisBT 2.28.3 and earlier contains six reflected XSS injection points in /admin/install.php. User-supplied parameters are echoed into HTML without escaping via printtestresult(). No authentication is required. A Content Security Policy (script-src…
When was CVE-2026-52847 disclosed?
CVE-2026-52847 was first published in the National Vulnerability Database on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
How do I remediate CVE-2026-52847?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52847, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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