CVE-2026-77508: Weblate: Unverified REST API email changes
Weblate is a web based localization tool. Prior to 2026.8, an authenticated user can change the account's primary email through PUT or PATCH requests to /api/users/{username}/ without verifying the new address, allowing a later team invitation for that address to be accepted without access to the intended recipient's mailbox. This issue is fixed in version 2026.8.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Weblateto a version that resolves this vulnerability.Fixed in 2026.8
Event History
Frequently Asked Questions
Who can exploit this issue?
An attacker must be authenticated to Weblate and able to send PUT or PATCH requests to the user API endpoint for an account. Exploitation also requires user interaction: a team invitation must later be sent to the unverified email address chosen by the attacker.
Are default or older deployments affected?
Weblate versions prior to 2026.8 are affected. The issue is fixed in Weblate 2026.8.
What is the impact if exploitation succeeds?
The attacker can set an unverified primary email address on an account, then accept a team invitation sent to that address without access to the intended recipient's mailbox. The reported impact is limited to integrity.