How severe is CVE-2023-28440?

CVE-2023-28440 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2023-28440 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-28440?

CVE-2023-28440 primarily affects Discourse. In total, 210 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-28440?

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

When was CVE-2023-28440 published?

CVE-2023-28440 was published on 2023-04-18 and last updated on 2026-06-17.

CVE-2023-28440

CVE-2023-28440 is a low-severity vulnerability in Discourse with a CVSS 3.x base score of 2.7. 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-400.

Key facts

Severity: Low (CVSS 3.x base score 2.7)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Discourse
Published: 2023-04-18
Last modified: 2026-06-17

Description

Discourse is an open source platform for community discussion. In affected versions a maliciously crafted request from a Discourse administrator can lead to a long-running request and eventual timeout. This has the greatest potential impact in shared hosting environments where admins are untrusted. This issue has been addressed in versions 3.0.3 and 3.1.0.beta4. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Frequently asked questions

What is CVE-2023-28440?: Discourse is an open source platform for community discussion. In affected versions a maliciously crafted request from a Discourse administrator can lead to a long-running request and eventual timeout. This has the greatest potential impact in shared hosting environments where admins are untrusted. This issue has been addressed in versions 3.0.3 and 3.1.0.beta4. Users are advised to upgrade. There are no known workarounds for this vulnerability.
How severe is CVE-2023-28440?: CVE-2023-28440 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2023-28440 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-28440?: CVE-2023-28440 primarily affects Discourse. In total, 210 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-28440?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-28440 published?: CVE-2023-28440 was published on 2023-04-18 and last updated on 2026-06-17.

References

https://github.com/discourse/discourse/security/advisories/GHSA-vm65-pv5h-6g3w

Affected products (210)

cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*
cpe:2.3:a:discourse:discourse:1.1.0:beta1:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.1.0:beta2:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.1.0:beta3:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.1.0:beta4:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.1.0:beta5:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.1.0:beta6:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.1.0:beta6b:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.1.0:beta7:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.1.0:beta8:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.2.0:beta1:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.2.0:beta2:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.2.0:beta3:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.2.0:beta4:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.2.0:beta5:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.2.0:beta6:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.2.0:beta7:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.2.0:beta8:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.2.0:beta9:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.3.0:beta1:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.3.0:beta10:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.3.0:beta11:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.3.0:beta2:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.3.0:beta3:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.3.0:beta4:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.3.0:beta5:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.3.0:beta6:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.3.0:beta7:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.3.0:beta8:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.3.0:beta9:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.4.0:beta1:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.4.0:beta10:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.4.0:beta11:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.4.0:beta12:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.4.0:beta2:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.4.0:beta3:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.4.0:beta4:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.4.0:beta5:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.4.0:beta6:*:*:beta:*:*:*
cpe:2.3:a:discourse:discourse:1.4.0:beta7:*:*:beta:*:*:*

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