How severe is CVE-2025-46556?

CVE-2025-46556 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-46556 being actively exploited?

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

What products are affected by CVE-2025-46556?

CVE-2025-46556 affects Mantisbt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-46556?

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

Does CVE-2025-46556 have an EU (EUVD) identifier?

Yes. CVE-2025-46556 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37509.

When was CVE-2025-46556 published?

CVE-2025-46556 was published on 2025-11-04 and last updated on 2026-06-17.

CVE-2025-46556

CVE-2025-46556 is a medium-severity vulnerability in Mantisbt with a CVSS 3.x base score of 6.5. 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-770.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-37509
Weakness: CWE-770
Affected product: Mantisbt
Published: 2025-11-04
Last modified: 2026-06-17

Description

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.27.1 and below allow attackers to permanently corrupt issue activity logs by submitting extremely long notes (tested with 4,788,761 characters) due to a lack of server-side validation of note length. Once such a note is added, the activity stream UI fails to render; therefore, new notes cannot be displayed, effectively breaking all future collaboration on the issue. This issue is fixed in version 2.27.2.

Frequently asked questions

What is CVE-2025-46556?: Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.27.1 and below allow attackers to permanently corrupt issue activity logs by submitting extremely long notes (tested with 4,788,761 characters) due to a lack of server-side validation of note length. Once such a note is added, the activity stream UI fails to render; therefore, new notes cannot be displayed, effectively breaking all future collaboration on the issue. This issue is fixed in version 2.27.2.
How severe is CVE-2025-46556?: CVE-2025-46556 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-46556 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-46556?: CVE-2025-46556 affects Mantisbt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-46556?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-46556 have an EU (EUVD) identifier?: Yes. CVE-2025-46556 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37509.
When was CVE-2025-46556 published?: CVE-2025-46556 was published on 2025-11-04 and last updated on 2026-06-17.

References

Affected products (1)

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

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