How severe is CVE-2011-1587?

CVE-2011-1587 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-1587 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1587?

CVE-2011-1587 primarily affects Mediawiki. In total, 136 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1587?

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

When was CVE-2011-1587 published?

CVE-2011-1587 was published on 2011-04-27 and last updated on 2026-06-16.

CVE-2011-1587

CVE-2011-1587 is a medium-severity vulnerability in Mediawiki with a CVSS 2.0 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-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mediawiki
Published: 2011-04-27
Last modified: 2026-06-16

Description

Cross-site scripting (XSS) vulnerability in MediaWiki before 1.16.4, when Internet Explorer 6 or earlier is used, allows remote attackers to inject arbitrary web script or HTML via an uploaded file accessed with a dangerous extension such as .html located before a ? (question mark) in a query string, in conjunction with a modified URI path that has a %2E sequence in place of the . (dot) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-1578.

Frequently asked questions

What is CVE-2011-1587?: Cross-site scripting (XSS) vulnerability in MediaWiki before 1.16.4, when Internet Explorer 6 or earlier is used, allows remote attackers to inject arbitrary web script or HTML via an uploaded file accessed with a dangerous extension such as .html located before a ? (question mark) in a query string, in conjunction with a modified URI path that has a %2E sequence in place of the . (dot) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-1578.
How severe is CVE-2011-1587?: CVE-2011-1587 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-1587 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1587?: CVE-2011-1587 primarily affects Mediawiki. In total, 136 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1587?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1587 published?: CVE-2011-1587 was published on 2011-04-27 and last updated on 2026-06-16.

References

Affected products (136)

cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.1.0:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.0:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.1:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.2:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.3:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.4:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.5:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.6:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.0:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.1:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.2:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.3:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.4:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.5:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.6:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.7:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.8:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.9:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.10:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.11:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.12:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.13:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.14:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.15:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta1:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta2:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta3:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta4:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta5:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta6:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.1:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.2:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.3:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.4:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.5:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.6:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.7:*:*:*:*:*:*:*

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