CVE-2026-58029 Full Account Takeover from BotPasswords and OAuth via action=changeauthenticationdata
Attackers can achieve full account takeover via OAuth or bot passwords due to improper authentication handling in the changeauthenticationdata API.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-58029?
CVE-2026-58029 is a medium-severity authentication bypass vulnerability in Mediawiki Mediawiki, published on 1 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Vulnerability in Wikimedia Foundation MediaWiki.
This vulnerability is associated with program files includes/Api/ApiChangeAuthenticationData.Php, includes/Api/ApiLinkAccount.Php, includes/Api/ApiRemoveAuthenticationData.Php, includes/Specials/SpecialLinkAccounts.Php, includes/Specials/SpecialUnlinkAccounts.Php.
This issue affects MediaWiki: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.
Weakness: CWE-287
Which versions are affected by CVE-2026-58029?
It affects 1 product.
Products include Mediawiki Mediawiki.
How do I fix CVE-2026-58029?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-58029 being exploited?
There is no known exploitation of CVE-2026-58029 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as DEBIAN-CVE-2026-58029, GHSA-gpg7-6j8p-9wg5, MINI-qxrx-6f2p-qhgr, MINI-rh3x-mppv-jwx6, MINI-x9wf-8324-h6jw, UBUNTU-CVE-2026-58029.