includes/libs/IEUrlExtension.php in the MediaWiki API in MediaWiki 1.19.x before 1.19.8, 1.20.x before 1.20.7, and 1.21.x before 1.21.2 does not properly detect extensions when there are an even number of "." (period) characters in a string, which allows remote attackers to conduct cross-site scripting (XSS) attacks via the siprop parameter in a query action to wiki/api.php
Published Dec 11, 2019
6.1
MEDIUMCVSS 3.1
EPSS 1.53%
Description
includes/libs/IEUrlExtension.php in the MediaWiki API in MediaWiki 1.19.x before 1.19.8, 1.20.x before 1.20.7, and 1.21.x before 1.21.2 does not properly detect extensions when there are an even number of "." (period) characters in a string, which allows remote attackers to conduct cross-site scripting (XSS) attacks via the siprop parameter in a query action to wiki/api.php.
Affected products
-
- Version 1.19.x before 1.19.8StatusaffectedConstraints-
- Version 1.20.x before 1.20.7StatusaffectedConstraints-
- Version and 1.21.x before 1.21.2StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wikimedia Foundation | MediaWiki | n/a |
|
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
2022-2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 1.53% (0.01527) | 73.81th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.53% (0.01527) | 71.33th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.40% (0.00402) | 58.69th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.54% (0.00544) | 78.13th | v3 (v2023.03.01) |
| Jul 6, 2024 | 0.65% (0.00648) | 79.47th | v3 (v2023.03.01) |
| Mar 7, 2024 | 0.45% (0.00453) | 74.62th | v3 (v2023.03.01) |
| Feb 5, 2024 | 0.45% (0.00453) | 72.61th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.47% (0.00472) | 71.83th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
References (5)
- http://lists.wikimedia.org/pipermail/mediawiki-announce/2013-September/000133.html x_refsource_MISCMailing ListPatchVendor Advisory
- http://seclists.org/oss-sec/2013/q3/553 x_refsource_MISCMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/62194 x_refsource_MISCThird Party AdvisoryVDB Entry
- https://bugzilla.wikimedia.org/show_bug.cgi?id=52746 x_refsource_MISCExploitIssue TrackingPatchVendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/86897 x_refsource_MISCThird Party AdvisoryVDB Entry
| Link | Providers | Tags |
|---|---|---|
| http://lists.wikimedia.org/pipermail/mediawiki-announce/2013-September/000133.html | x_refsource_MISCMailing ListPatchVendor Advisory | |
| http://seclists.org/oss-sec/2013/q3/553 | x_refsource_MISCMailing ListThird Party Advisory | |
| http://www.securityfocus.com/bid/62194 | x_refsource_MISCThird Party AdvisoryVDB Entry | |
| https://bugzilla.wikimedia.org/show_bug.cgi?id=52746 | x_refsource_MISCExploitIssue TrackingPatchVendor Advisory | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/86897 | x_refsource_MISCThird Party AdvisoryVDB Entry |
Change history (0)
No recorded changes yet.