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PHP CVE-2026-44657

HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-05-11 https://github.com/mantisbt/mantisbt GHSA-p6fr-rxq7-xcg8
PHP XSS CSRF
7.5
CVSS 4.0
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CVSS VectorNVD

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
P
Scope
X

Lifecycle Timeline

2
CVSS changed
May 28, 2026 - 21:22 NVD
7.5 (HIGH)
CVE Published
May 11, 2026 - 19:40 nvd
HIGH

DescriptionNVD

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.

Impact

Cross-site scripting

Patches

  • 26647b2e68ba30b9d7987d4e03d7a16416684bc2

Workarounds

None

Credits

Thanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.

Analysis

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. Cross-site scripting - 26647b2e68ba30b9d7987d4e03d7a16416684bc2 None Thanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.

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CVE-2026-44657 vulnerability details – vuln.today
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