CVE-2026-47156

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Source
https://cve.org/CVERecord?id=CVE-2026-47156
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47156.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-47156
Aliases
Published
2026-09-09T16:06:40Z
Modified
2026-09-12T03:30:19Z
Severity
  • 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
MantisBT: SOAP API Authentication Bypass with Privilege Escalation to Administrator
Details

MantisBT is an open source bug tracker. Versions 2.28.3 and earlier contain a critical authentication bypass in the SOAP API's mci_check_login() function. Any user knowing any valid cookie_string can authenticate as any other user (knowing their username), including the administrator, without knowing the target's password. The vulnerability is exploitable with zero prior access on default MantisBT installations because self-registration is enabled by default ($g_allow_signup = ON). A self-registered user can use their own cookie_string (readable from their browser's MANTIS_STRING_COOKIE cookie after login) to impersonate the administrator via the SOAP API. The REST API is NOT affected. The REST API's AuthMiddleware derives the username server-side from the API token or session cookie, so the username cannot be spoofed. The Web UI is NOT affected. The Web UI authenticates via PHP session cookies (PHPSESSID) and validates the MANTIS_STRING_COOKIE against the logged-in user through auth_is_cookie_valid(). The username is derived server-side from the cookie, not supplied by the client. Version 2.28.4 contains a patch. No known workarounds are available.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-287",
        "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47156.json"
}
References

Affected packages

Git / github.com/mantisbt/mantisbt

Affected ranges

Type
GIT
Repo
https://github.com/mantisbt/mantisbt
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
e3571c319b1721b41b0dc4b5b5203cbdcbe0c2ee
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.28.4"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

release-1.*
release-1.2.0a1
release-1.2.0a2
release-1.2.0a3
release-1.2.0rc1
release-1.3.0-beta.1
release-1.3.0-beta.2
release-1.3.0-beta.3
release-1.3.0-rc.1
release-1.3.0-rc.2
release-2.*
release-2.0.0
release-2.0.0-beta.1
release-2.0.0-beta.2
release-2.0.0-beta.3
release-2.0.0-rc.1
release-2.0.0-rc.2
release-2.1.0
release-2.10.0
release-2.11.0
release-2.12.0
release-2.13.0
release-2.14.0
release-2.15.0
release-2.16.0
release-2.17.0
release-2.18.0
release-2.19.0
release-2.2.0
release-2.20.0
release-2.21.0
release-2.22.0
release-2.23.0
release-2.24.0
release-2.25.0
release-2.26.0
release-2.27.0
release-2.28.0
release-2.28.1
release-2.28.2
release-2.28.3
release-2.3.0
release-2.4.0
release-2.5.0
release-2.6.0
release-2.7.0
release-2.8.0
release-2.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47156.json"