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The vulnerability in Weblate arises from insufficient server-side validation during the invitation acceptance process. When a user generates an invitation, such as for project collaboration, the system creates a unique token or URL for acceptance. However, this token is not adequately bound to the initiating user’s session or identity. Consequently, if another user obtains the invitation link—for instance, through session hijacking, phishing, or accessing an unattended browser—they can submit an acceptance request. The endpoint processing this request fails to verify whether the accepting user matches the intended recipient or the inviter, allowing cross-user acceptance. This flaw exploits weak session management and token integrity checks. Specifically, the invitation mechanism might rely solely on token validity without contextual user validation, enabling privilege escalation or unauthorized team additions. The attack requires the attacker to have access to the invitation link, which may be shared inadvertently or left open in an active session. While the impact is limited to invitation misuse, it can lead to unauthorized access to sensitive projects or organizational units. Patches likely involve reinforcing validation by tying tokens to user sessions, implementing strict identity checks, and ensuring tokens are single-use and time-bound. This low-severity issue underscores the importance of robust session handling in web applications.
Platform: Weblate
Version: Not specified
Vulnerability: Improper invitation validation
Severity: Low
date: Dec 15 2025
Prediction: Patch date unknown
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Bash commands and codes related to the blog
Check Weblate version
weblate –version
Inspect running Weblate container
docker ps | grep weblate
Curl to test invitation endpoint
curl -X POST https://weblate.example.com/invite/accept?token=ABC123
Monitor session logs
tail -f /var/log/weblate/sessions.log
how Exploit:
An attacker accesses an invitation link from an unattended session or via phishing. They then submit the acceptance request while logged in as a different user, bypassing validation. Exploit requires token capture and active Weblate access.
Protection from this CVE:
Update Weblate immediately. Implement session timeouts and enforce user-specific token validation. Use secure, time-bound invitations and educate users on session security.
Impact:
Unauthorized project access. Team membership hijacking. Low privilege escalation.
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Sources:
Reported By: github.com
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