Description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.27.1 and below allow attackers to permanently corrupt issue activity logs by submitting extremely long notes (tested with 4,788,761 characters) due to a lack of server-side validation of note length. Once such a note is added, the activity stream UI fails to render; therefore, new notes cannot be displayed, effectively breaking all future collaboration on the issue. This issue is fixed in version 2.27.2.
References (4)
Core 4
Core References
Vendor Advisory x_refsource_confirm
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5
Patch x_refsource_misc
https://github.com/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead9864234
Patch x_refsource_misc
https://github.com/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa4238
Scores
CVSS v3
6.5
EPSS
0.0006
EPSS Percentile
17.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-770
Status
published
Products (2)
mantisbt/mantisbt
< 2.27.2
mantisbt/mantisbt
0 - 2.27.2Packagist
Published
Nov 04, 2025
Tracked Since
Feb 18, 2026