How severe is CVE-2026-32243?

CVE-2026-32243 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-2026-32243 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-32243?

CVE-2026-32243 primarily affects Discourse. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-32243?

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

Does CVE-2026-32243 have an EU (EUVD) identifier?

Yes. CVE-2026-32243 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17549.

When was CVE-2026-32243 published?

CVE-2026-32243 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-32243

CVE-2026-32243 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: 5.3
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17549
Weakness: CWE-79
Affected product: Discourse
Published: 2026-03-31
Last modified: 2026-06-17

Description

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an attacker with the ability to create shared AI conversations could inject arbitrary HTML and JavaScript via crafted conversation titles. This payload would execute in the browser of any user viewing the onebox preview, potentially allowing session hijacking or unauthorized actions on behalf of the victim. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.

Frequently asked questions

What is CVE-2026-32243?: Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an attacker with the ability to create shared AI conversations could inject arbitrary HTML and JavaScript via crafted conversation titles. This payload would execute in the browser of any user viewing the onebox preview, potentially allowing session hijacking or unauthorized actions on behalf of the victim. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.
How severe is CVE-2026-32243?: CVE-2026-32243 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-2026-32243 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-32243?: CVE-2026-32243 primarily affects Discourse. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-32243?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-32243 have an EU (EUVD) identifier?: Yes. CVE-2026-32243 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17549.
When was CVE-2026-32243 published?: CVE-2026-32243 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:discourse:discourse:*:*:*:*:latest:*:*:*
cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:*
cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest.1:*:*:*

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