CVE-2026-58036: Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki.

Routine

HIGH 7.5REMOTEDOWNGRADE

CVE-2026-58036 is a high-severity flaw (CVSS 7.5) affecting mediawiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Api/ApiQueryAllUsers.Php, includes/Api/ApiQueryUsers.Php, includes/Permissions/PermissionManager.Php, includes/User/UserGroupManager.Php.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-07-01
Last modified	2026-10-25

Publisher (CNA): wikimedia-foundation · Vendor: mediawiki

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-01 16:16 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

mediawiki mediawiki DOWNGRADE

Affected: 1.46.0 rc0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.46.0

1. Check installed version

apt-cache policy mediawiki || rpm -q mediawiki || mediawiki --version

2. No fixed release: DOWNGRADE to a release before 1.46.0 (Debian / Ubuntu)

apt-cache madison mediawiki sudo apt install mediawiki=<VERSION_BEFORE_1.46.0> sudo apt-mark hold mediawiki

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mediawiki sudo dnf downgrade mediawiki-<VERSION_BEFORE_1.46.0> sudo dnf versionlock add mediawiki

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-58036?

mediawiki: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-58036 being exploited?

CVE-2026-58036 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-58036 affect?

CVE-2026-58036 affects mediawiki. Severity is high (CVSS 7.5). Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Api/ApiQueryAllUsers.Php, includes/Api/ApiQueryUsers.Php, includes/Pe

How urgent is CVE-2026-58036?

Priority 37/100. High severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

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CVE-2026-58029 MEDIUM 6.5 UPGRADE Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files include
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References

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