How severe is CVE-2025-54411?

CVE-2025-54411 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-54411 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-54411?

CVE-2025-54411 primarily affects Discourse. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-54411?

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

Does CVE-2025-54411 have an EU (EUVD) identifier?

Yes. CVE-2025-54411 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25192.

When was CVE-2025-54411 published?

CVE-2025-54411 was published on 2025-08-19 and last updated on 2026-06-17.

CVE-2025-54411

CVE-2025-54411 is a medium-severity vulnerability in Discourse with a CVSS 3.x base score of 5.4. 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 5.4)
CVSS v4: 2.4
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25192
Weakness: CWE-79
Affected product: Discourse
Published: 2025-08-19
Last modified: 2026-06-17

Description

Discourse is an open-source discussion platform. Welcome banner user name string for logged in users can be vulnerable to XSS attacks, which affect the user themselves or an admin impersonating them. Admins can temporarily alter the welcome_banner.header.logged_in_members site text to remove the preferred_display_name placeholder, or not impersonate any users for the time being. This vulnerability is fixed in 3.5.0.beta8.

Frequently asked questions

What is CVE-2025-54411?: Discourse is an open-source discussion platform. Welcome banner user name string for logged in users can be vulnerable to XSS attacks, which affect the user themselves or an admin impersonating them. Admins can temporarily alter the welcome_banner.header.logged_in_members site text to remove the preferred_display_name placeholder, or not impersonate any users for the time being. This vulnerability is fixed in 3.5.0.beta8.
How severe is CVE-2025-54411?: CVE-2025-54411 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-54411 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-54411?: CVE-2025-54411 primarily affects Discourse. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-54411?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-54411 have an EU (EUVD) identifier?: Yes. CVE-2025-54411 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25192.
When was CVE-2025-54411 published?: CVE-2025-54411 was published on 2025-08-19 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:a:discourse:discourse:*:*:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:3.5.0:beta1:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:3.5.0:beta2:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:3.5.0:beta3:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:3.5.0:beta4:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:3.5.0:beta5:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:3.5.0:beta6:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:3.5.0:beta7:*:*:beta:*:*:*

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