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Vulnerability details: VCID-qcju-srd2-3qeg
Vulnerability ID VCID-qcju-srd2-3qeg
Aliases CVE-2026-44657
GHSA-p6fr-rxq7-xcg8
Summary Mantis Bug Tracker (MantisBT) is an open source issue tracker. Prior to 2.28.2, using show_inline=1 parameter and a valid file_show_inline_token CSRF token on file_download.php, an attacker can execute code by uploading a crafted XHTML attachment referencing a JavaScript attachment. This vulnerability is fixed in 2.28.2.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00072 https://api.first.org/data/v1/epss?cve=CVE-2026-44657
epss 0.00072 https://api.first.org/data/v1/epss?cve=CVE-2026-44657
epss 0.00072 https://api.first.org/data/v1/epss?cve=CVE-2026-44657
epss 0.00072 https://api.first.org/data/v1/epss?cve=CVE-2026-44657
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-p6fr-rxq7-xcg8
cvssv4 7.5 https://github.com/mantisbt/mantisbt
generic_textual HIGH https://github.com/mantisbt/mantisbt
cvssv4 7.5 https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2
generic_textual HIGH https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2
ssvc Track https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2
cvssv4 7.5 https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
generic_textual HIGH https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
ssvc Track https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
cvssv3.1_qr HIGH https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8
cvssv4 7.5 https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8
generic_textual HIGH https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8
ssvc Track https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8
cvssv4 7.5 https://mantisbt.org/bugs/view.php?id=37020
generic_textual HIGH https://mantisbt.org/bugs/view.php?id=37020
ssvc Track https://mantisbt.org/bugs/view.php?id=37020
cvssv4 7.5 https://nvd.nist.gov/vuln/detail/CVE-2026-44657
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-44657
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-44657
https://github.com/mantisbt/mantisbt
https://nvd.nist.gov/vuln/detail/CVE-2026-44657
26647b2e68ba30b9d7987d4e03d7a16416684bc2 https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2
GHSA-9c3j-xm6v-j7j3 https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
GHSA-p6fr-rxq7-xcg8 https://github.com/advisories/GHSA-p6fr-rxq7-xcg8
GHSA-p6fr-rxq7-xcg8 https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8
view.php?id=37020 https://mantisbt.org/bugs/view.php?id=37020
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/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)

network

adjacent

local

physical

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passive

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N Found at https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2
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

high

none

present

none

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passive

active

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-29T14:49:46Z/ Found at https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N Found at https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
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

high

none

present

none

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passive

active

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-29T14:49:46Z/ Found at https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N Found at https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8
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

high

none

present

none

low

high

none

passive

active

high

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none

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-29T14:49:46Z/ Found at https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N Found at https://mantisbt.org/bugs/view.php?id=37020
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

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-29T14:49:46Z/ Found at https://mantisbt.org/bugs/view.php?id=37020
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-44657
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

high

none

present

none

low

high

none

passive

active

high

low

none

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Exploit Prediction Scoring System (EPSS)
Percentile 0.22077
EPSS Score 0.00072
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:42:34.624428+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/44xxx/CVE-2026-44657.json 38.6.0