How severe is CVE-2026-33517?

CVE-2026-33517 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-33517 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33517?

CVE-2026-33517 affects Mantisbt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33517?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33517 have an EU (EUVD) identifier?

Yes. CVE-2026-33517 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14523.

When was CVE-2026-33517 published?

CVE-2026-33517 was published on 2026-03-23 and last updated on 2026-06-17.

CVE-2026-33517

CVE-2026-33517 is a medium-severity vulnerability in Mantisbt with a CVSS 3.x base score of 6.1. 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: Medium (CVSS 3.x base score 6.1)
CVSS v4: 8.6
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14523
Weakness: CWE-79
Affected product: Mantisbt
Published: 2026-03-23
Last modified: 2026-06-17

Description

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, when deleting a Tag (tag_delete.php), improper escaping of its name when displaying the confirmation message allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript. Version 2.28.1 fixes the issue. Workarounds include reverting commit d6890320752ecf37bd74d11fe14fe7dc12335be9 and/or manually editing language files to remove the sprintf placeholder `%1$s` from `$s_tag_delete_message` string.

Frequently asked questions

What is CVE-2026-33517?: Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, when deleting a Tag (tag_delete.php), improper escaping of its name when displaying the confirmation message allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript. Version 2.28.1 fixes the issue. Workarounds include reverting commit d6890320752ecf37bd74d11fe14fe7dc12335be9 and/or manually editing language files to remove the sprintf placeholder `%1$s` from `$s_tag_delete_message` string.
How severe is CVE-2026-33517?: CVE-2026-33517 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-33517 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33517?: CVE-2026-33517 affects Mantisbt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33517?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33517 have an EU (EUVD) identifier?: Yes. CVE-2026-33517 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14523.
When was CVE-2026-33517 published?: CVE-2026-33517 was published on 2026-03-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mantisbt:mantisbt:2.28.0:*:*:*:*:*:*:*

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