How severe is CVE-2026-44657?

CVE-2026-44657 has a CVSS 4.0 base score of 7.5, rated high severity.

Is CVE-2026-44657 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-44657?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-44657 have an EU (EUVD) identifier?

Yes. CVE-2026-44657 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33023.

When was CVE-2026-44657 published?

CVE-2026-44657 was published on 2026-05-28 and last updated on 2026-06-17.

CVE-2026-44657

CVE-2026-44657 is a high-severity vulnerability with a CVSS 4.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 4.0 base score 7.5)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33023
Weakness: CWE-79
Published: 2026-05-28
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-44657?: 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.
How severe is CVE-2026-44657?: CVE-2026-44657 has a CVSS 4.0 base score of 7.5, rated high severity.
Is CVE-2026-44657 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-44657?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-44657 have an EU (EUVD) identifier?: Yes. CVE-2026-44657 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33023.
When was CVE-2026-44657 published?: CVE-2026-44657 was published on 2026-05-28 and last updated on 2026-06-17.

References

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