Description
MantisBT before 1.2.18 uses the public_key parameter value as the key to the CAPTCHA answer, which allows remote attackers to bypass the CAPTCHA protection mechanism by leveraging knowledge of a CAPTCHA answer for a public_key parameter value, as demonstrated by E4652 for the public_key value 0.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | mantis | 1.2.18-1 | DSA-3120-1 |
Advisories 1
- DSA-3120-1 mantis - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- 71321 vdb-entry
- mantisbt-cve20149117-sec-bypass(99004) vdb-entry
- [oss-security] 20141126 CVE Request: CAPTCHA bypass in MantisBT mailing-list
- [oss-security] 20141126 Re: CVE Request: CAPTCHA bypass in MantisBT mailing-list
- 62101 third-party-advisory
- https://www.mantisbt.org/bugs/view.php?id=17811
- https://github.com/mantisbt/mantisbt/commit/7bb78e45
- DSA-3120 vendor-advisory