How severe is CVE-2021-36127?

CVE-2021-36127 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-36127 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36127?

CVE-2021-36127 affects Mediawiki. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36127?

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

When was CVE-2021-36127 published?

CVE-2021-36127 was published on 2021-07-02 and last updated on 2026-06-17.

CVE-2021-36127

CVE-2021-36127 is a medium-severity vulnerability in Mediawiki with a CVSS 3.x base score of 4.3. 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-922.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-922
Affected product: Mediawiki
Published: 2021-07-02
Last modified: 2026-06-17

Description

An issue was discovered in the CentralAuth extension in MediaWiki through 1.36. The Special:GlobalUserRights page provided search results which, for a suppressed MediaWiki user, were different than for any other user, thus easily disclosing suppressed accounts (which are supposed to be completely hidden).

Frequently asked questions

What is CVE-2021-36127?: An issue was discovered in the CentralAuth extension in MediaWiki through 1.36. The Special:GlobalUserRights page provided search results which, for a suppressed MediaWiki user, were different than for any other user, thus easily disclosing suppressed accounts (which are supposed to be completely hidden).
How severe is CVE-2021-36127?: CVE-2021-36127 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-36127 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36127?: CVE-2021-36127 affects Mediawiki. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36127?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-36127 published?: CVE-2021-36127 was published on 2021-07-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*

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