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Vulnerability details: VCID-9y6t-pvae-vuar
Vulnerability ID VCID-9y6t-pvae-vuar
Aliases CVE-2026-40598
GHSA-6jh4-47v2-4g37
Summary MantisBT has Potential Referer-Based Reflected HTML Injection / XSS in Tag Update Page Improper escaping of the redirection page (retrieved from the request's *Referer* header) allows an attacker to inject HTML. While this is generally not directly actionable as modern browsers will URL-encode special characters, on some specific server configurations this could poison the cache, leading to cross-site scripting. ### Impact Cross-site scripting (XSS). ### Patches - b1ebc57763f104eb5f541b7b4d1ce6948168abd9 ### Workarounds None ### Credits Thanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
epss 0.00059 https://api.first.org/data/v1/epss?cve=CVE-2026-40598
epss 0.00059 https://api.first.org/data/v1/epss?cve=CVE-2026-40598
epss 0.00059 https://api.first.org/data/v1/epss?cve=CVE-2026-40598
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-6jh4-47v2-4g37
cvssv4 6.9 https://github.com/mantisbt/mantisbt
generic_textual MODERATE https://github.com/mantisbt/mantisbt
cvssv4 6.9 https://github.com/mantisbt/mantisbt/commit/b1ebc57763f104eb5f541b7b4d1ce6948168abd9
generic_textual MODERATE https://github.com/mantisbt/mantisbt/commit/b1ebc57763f104eb5f541b7b4d1ce6948168abd9
ssvc Track https://github.com/mantisbt/mantisbt/commit/b1ebc57763f104eb5f541b7b4d1ce6948168abd9
cvssv3.1_qr MODERATE https://github.com/mantisbt/mantisbt/security/advisories/GHSA-6jh4-47v2-4g37
cvssv4 6.9 https://github.com/mantisbt/mantisbt/security/advisories/GHSA-6jh4-47v2-4g37
generic_textual MODERATE https://github.com/mantisbt/mantisbt/security/advisories/GHSA-6jh4-47v2-4g37
ssvc Track https://github.com/mantisbt/mantisbt/security/advisories/GHSA-6jh4-47v2-4g37
cvssv4 6.9 https://mantisbt.org/bugs/view.php?id=37017
generic_textual MODERATE https://mantisbt.org/bugs/view.php?id=37017
ssvc Track https://mantisbt.org/bugs/view.php?id=37017
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-40598
https://github.com/mantisbt/mantisbt
https://github.com/mantisbt/mantisbt/commit/b1ebc57763f104eb5f541b7b4d1ce6948168abd9
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-6jh4-47v2-4g37
https://mantisbt.org/bugs/view.php?id=37017
GHSA-6jh4-47v2-4g37 https://github.com/advisories/GHSA-6jh4-47v2-4g37
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/mantisbt/mantisbt
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/mantisbt/mantisbt/commit/b1ebc57763f104eb5f541b7b4d1ce6948168abd9
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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passive

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-23T02:39:01Z/ Found at https://github.com/mantisbt/mantisbt/commit/b1ebc57763f104eb5f541b7b4d1ce6948168abd9
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/mantisbt/mantisbt/security/advisories/GHSA-6jh4-47v2-4g37
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

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present

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passive

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-23T02:39:01Z/ Found at https://github.com/mantisbt/mantisbt/security/advisories/GHSA-6jh4-47v2-4g37
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://mantisbt.org/bugs/view.php?id=37017
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

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none

present

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passive

active

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-23T02:39:01Z/ Found at https://mantisbt.org/bugs/view.php?id=37017
Exploit Prediction Scoring System (EPSS)
Percentile 0.1863
EPSS Score 0.00059
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T17:02:10.618487+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-6jh4-47v2-4g37/GHSA-6jh4-47v2-4g37.json 38.6.0