Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-3nh1-gqxv-jyce
Vulnerability ID VCID-3nh1-gqxv-jyce
Aliases CVE-2026-34754
GHSA-h4x5-gvx6-3rwc
Summary MantisBT has an Authorization Bypass that Allows Uploading Attachments to Private Issues via REST API ### Impact MantisBT allows an authenticated user to upload attachments to private Issues they are not authorized to access. ### Patches - b262b4d2835b81394d75356dead66e52a6275206 ### Workarounds None. ### Credits Thanks to Vishal Shukla for discovering and responsibly reporting the issue.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-284 Improper Access Control
System Score Found at
epss 0.00028 https://api.first.org/data/v1/epss?cve=CVE-2026-34754
epss 0.00028 https://api.first.org/data/v1/epss?cve=CVE-2026-34754
epss 0.00028 https://api.first.org/data/v1/epss?cve=CVE-2026-34754
epss 0.00028 https://api.first.org/data/v1/epss?cve=CVE-2026-34754
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-h4x5-gvx6-3rwc
cvssv3.1 4.3 https://github.com/mantisbt/mantisbt
generic_textual MODERATE https://github.com/mantisbt/mantisbt
cvssv3.1 4.3 https://github.com/mantisbt/mantisbt/commit/b262b4d2835b81394d75356dead66e52a6275206
generic_textual MODERATE https://github.com/mantisbt/mantisbt/commit/b262b4d2835b81394d75356dead66e52a6275206
ssvc Track https://github.com/mantisbt/mantisbt/commit/b262b4d2835b81394d75356dead66e52a6275206
cvssv3.1 4.3 https://github.com/mantisbt/mantisbt/security/advisories/GHSA-h4x5-gvx6-3rwc
cvssv3.1_qr MODERATE https://github.com/mantisbt/mantisbt/security/advisories/GHSA-h4x5-gvx6-3rwc
generic_textual MODERATE https://github.com/mantisbt/mantisbt/security/advisories/GHSA-h4x5-gvx6-3rwc
ssvc Track https://github.com/mantisbt/mantisbt/security/advisories/GHSA-h4x5-gvx6-3rwc
cvssv3.1 4.3 https://mantisbt.org/bugs/view.php?id=36976
generic_textual MODERATE https://mantisbt.org/bugs/view.php?id=36976
ssvc Track https://mantisbt.org/bugs/view.php?id=36976
cvssv3.1 4.3 https://nvd.nist.gov/vuln/detail/CVE-2026-34754
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-34754
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-34754
https://github.com/mantisbt/mantisbt
https://github.com/mantisbt/mantisbt/commit/b262b4d2835b81394d75356dead66e52a6275206
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-h4x5-gvx6-3rwc
https://mantisbt.org/bugs/view.php?id=36976
https://nvd.nist.gov/vuln/detail/CVE-2026-34754
GHSA-h4x5-gvx6-3rwc https://github.com/advisories/GHSA-h4x5-gvx6-3rwc
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Found at https://github.com/mantisbt/mantisbt
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Found at https://github.com/mantisbt/mantisbt/commit/b262b4d2835b81394d75356dead66e52a6275206
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-20T15:07:20Z/ Found at https://github.com/mantisbt/mantisbt/commit/b262b4d2835b81394d75356dead66e52a6275206
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Found at https://github.com/mantisbt/mantisbt/security/advisories/GHSA-h4x5-gvx6-3rwc
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-20T15:07:20Z/ Found at https://github.com/mantisbt/mantisbt/security/advisories/GHSA-h4x5-gvx6-3rwc
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Found at https://mantisbt.org/bugs/view.php?id=36976
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-20T15:07:20Z/ Found at https://mantisbt.org/bugs/view.php?id=36976
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-34754
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.08411
EPSS Score 0.00028
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T17:02:41.208057+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-h4x5-gvx6-3rwc/GHSA-h4x5-gvx6-3rwc.json 38.6.0