CVE-2019-16738

MediaWiki information disclosure

5.3 MediumFix available

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: None

Exploit likelihood

1.77%Up 0.5 points since Apr 14, 2021

What each source reports

NVD Score used 5.3

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

Record: CVE-2019-16738
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness: CWE-862
Updated: 2026-11-02

CVE List No score

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

Record: CVE-2019-16738
Updated: 2026-11-02

EUVDEUVD-2022-3016 No score

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

Record: EUVD-2022-3016
Updated: 2026-11-03

GitHub AdvisoriesGHSA-7hwr-f745-5rwq 5.3

MediaWiki information disclosure

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

Record: GHSA-7hwr-f745-5rwq
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-200, CWE-862
Updated: 2026-11-02

OSV 5.3

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

Record: CVE-2019-16738
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2019-16738 5.3

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

Record: DEBIAN-CVE-2019-16738
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

OSVGHSA-7hwr-f745-5rwq 5.3

MediaWiki information disclosure

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

Record: GHSA-7hwr-f745-5rwq
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-200, CWE-862
Updated: 2026-11-02

OSVUBUNTU-CVE-2019-16738 5.3

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

Record: UBUNTU-CVE-2019-16738
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

OSVMGASA-2019-0301 No score

Updated mediawiki packages fix security vulnerability

Updated mediawiki packages fix security vulnerability:

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup (CVE-2019-16738).

Record: MGASA-2019-0301
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`mediawiki/core` Packagist	1.31.0 up to 1.31.4	1.31.4
`mediawiki/core` Packagist	1.32.0 up to 1.32.4	1.32.4
`mediawiki/core` Packagist	1.33.0 up to 1.33.1	1.33.1
`mediawiki` Debian:12	before 1:1.31.4-1	1:1.31.4-1
`mediawiki` Debian:13	before 1:1.31.4-1	1:1.31.4-1
`mediawiki` Debian:14	before 1:1.31.4-1	1:1.31.4-1
`mediawiki` Debian:9	before 1:1.27.7-1~deb9u2, plus listed versions 1:1.27.3-11:1.27.4-11:1.27.4-1~bpo8+11:1.27.4-1~deb9u11:1.27.4-2 Show 4 moreShow less 1:1.27.4-31:1.27.5-1~deb9u11:1.27.6-1~deb9u11:1.27.7-1~deb9u1	1:1.27.7-1~deb9u2
`mediawiki` Debian:10	before 1:1.31.4-1~deb10u1, plus listed versions 1:1.31.2-1	1:1.31.4-1~deb10u1
`mediawiki/core` Packagist	1.31.0 up to 1.31.4, plus listed versions 1.31.11.31.21.31.3	1.31.4
`mediawiki/core` Packagist	1.32.0 up to 1.32.4, plus listed versions 1.32.11.32.21.32.3	1.32.4

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Affected packages
Package	Affected	Fixed
`mediawiki` Mageia:7	before 1.31.5-1.mga7	1.31.5-1.mga7
`mediawiki` Ubuntu:18.04:LTS	All versions, plus listed versions 1:1.27.3-11:1.27.4-11:1.27.4-21:1.27.4-3	None known
`mediawiki` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 1:1.31.2-1ubuntu11:1.31.5-11:1.31.5-1ubuntu11:1.31.5-21:1.31.5-3 Show 4 moreShow less 1:1.31.5-3ubuntu11:1.31.6-11:1.31.7-11:1.31.7-1ubuntu0.1~esm1	None known
`mediawiki` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 1:1.35.3-11:1.35.4-11:1.35.5-11:1.35.5-1ubuntu11:1.35.5-1ubuntu21:1.35.5-1ubuntu31:1.35.6-11:1.35.6-1ubuntu0.1~esm1	None known
`mediawiki` Ubuntu:Pro:24.04:LTS	All versions, plus listed versions 1:1.39.4-21:1.39.5-11:1.39.6-11:1.39.7-11:1.39.7-1ubuntu0.1~esm1	None known
`mediawiki` Ubuntu:25.10	All versions, plus listed versions 1:1.43.1+dfsg-11:1.43.1+dfsg-21:1.43.3+dfsg-1	None known
`mediawiki` Ubuntu:26.10	All versions, plus listed versions 1:1.43.8+dfsg-21:1.43.9+dfsg-11:1.43.9+dfsg-1ubuntu1	None known
`mediawiki` Ubuntu:26.04:LTS	All versions, plus listed versions 1:1.43.3+dfsg-11:1.43.5+dfsg-11:1.43.6+dfsg-21:1.43.8+dfsg-11:1.43.8+dfsg-2	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-16738 is a medium vulnerability (CVSS 5.3) in Mediawiki, published September 26, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.77%, the 78th percentile. Fixed in mediawiki/core 1.31.4.

References

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