How severe is CVE-2025-23023?

CVE-2025-23023 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability low.

Is CVE-2025-23023 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-23023?

CVE-2025-23023 affects Discourse. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-23023?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-23023 have an EU (EUVD) identifier?

Yes. CVE-2025-23023 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-3079.

When was CVE-2025-23023 published?

CVE-2025-23023 was published on 2025-02-04 and last updated on 2026-06-17.

CVE-2025-23023

CVE-2025-23023 is a high-severity vulnerability in Discourse with a CVSS 3.x base score of 8.2. 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-346.

Key facts

Severity: High (CVSS 3.x base score 8.2)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-3079
Weakness: CWE-346
Affected product: Discourse
Published: 2025-02-04
Last modified: 2026-06-17

Description

Discourse is an open source platform for community discussion. In affected versions an attacker can carefully craft a request with the right request headers to poison the anonymous cache (for example, the cache may have a response with missing preloaded data). This issue only affects anonymous visitors of the site. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade may disable anonymous cache by setting the `DISCOURSE_DISABLE_ANON_CACHE` environment variable to a non-empty value.

Frequently asked questions

What is CVE-2025-23023?: Discourse is an open source platform for community discussion. In affected versions an attacker can carefully craft a request with the right request headers to poison the anonymous cache (for example, the cache may have a response with missing preloaded data). This issue only affects anonymous visitors of the site. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade may disable anonymous cache by setting the `DISCOURSE_DISABLE_ANON_CACHE` environment variable to a non-empty value.
How severe is CVE-2025-23023?: CVE-2025-23023 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability low.
Is CVE-2025-23023 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-23023?: CVE-2025-23023 affects Discourse. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-23023?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-23023 have an EU (EUVD) identifier?: Yes. CVE-2025-23023 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-3079.
When was CVE-2025-23023 published?: CVE-2025-23023 was published on 2025-02-04 and last updated on 2026-06-17.

References

https://github.com/discourse/discourse/security/advisories/GHSA-5h4h-2f46-r3c7

Affected products (1)

cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*

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