How severe is CVE-2021-41140?

CVE-2021-41140 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-41140 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41140?

CVE-2021-41140 affects Discourse Discourse Reactions. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-41140?

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

When was CVE-2021-41140 published?

CVE-2021-41140 was published on 2021-10-19 and last updated on 2026-06-17.

CVE-2021-41140

CVE-2021-41140 is a medium-severity vulnerability in Discourse Discourse Reactions with a CVSS 3.x base score of 5.3. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Discourse Discourse Reactions
Published: 2021-10-19
Last modified: 2026-06-17

Description

Discourse-reactions is a plugin for the Discourse platform that allows user to add their reactions to the post. In affected versions reactions given by user to secure topics and private messages are visible. This issue is patched in version 0.2 of discourse-reaction. Users who are unable to update are advised to disable the Discourse-reactions plugin in admin panel.

Frequently asked questions

What is CVE-2021-41140?: Discourse-reactions is a plugin for the Discourse platform that allows user to add their reactions to the post. In affected versions reactions given by user to secure topics and private messages are visible. This issue is patched in version 0.2 of discourse-reaction. Users who are unable to update are advised to disable the Discourse-reactions plugin in admin panel.
How severe is CVE-2021-41140?: CVE-2021-41140 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-41140 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41140?: CVE-2021-41140 affects Discourse Discourse Reactions. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-41140?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-41140 published?: CVE-2021-41140 was published on 2021-10-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:discourse:discourse_reactions:*:*:*:*:*:discourse:*:*

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