CVE-2026-77508: CWE-302: Authentication Bypass by Assumed-Immutable Data in WeblateOrg weblate
Description
Weblate versions prior to 2026.8 contain an authentication bypass vulnerability where an authenticated user can change their account's primary email without verifying the new address. This allows acceptance of team invitations sent to the new email without access to the intended recipient's mailbox. The issue is fixed in version 2026.8.
CVSS v3.1
Score 3.5low
Affected software
WeblateOrg
weblate
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-77508 is an authentication bypass vulnerability in Weblate before version 2026.8. It arises because the application allows an authenticated user to update their primary email address via PUT or PATCH requests to the /api/users/{username}/ endpoint without verifying the new email address. This flaw enables a user to accept team invitations sent to the newly set email address without having access to that mailbox, potentially bypassing intended access controls. The vulnerability is classified under CWE-302 (Authentication Bypass) and CWE-841 (Improper Enforcement of Message Integrity).
Potential Impact
An attacker with authenticated access can change their account's primary email to an address they do not control and subsequently accept team invitations sent to that email. This could lead to unauthorized access to team resources or collaboration spaces. The CVSS score is 3.5 (low severity), indicating limited impact primarily on integrity with no confidentiality or availability impact.
Mitigation Recommendations
Upgrade Weblate to version 2026.8 or later, where this vulnerability has been fixed. No other mitigation or temporary workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-20T20:23:02.506Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8f4799acd9273b49557d98
Added to database: 08/26/2026, 20:07:53 UTC
Last enriched: 09/10/2026, 10:08:15 UTC
Last updated: 10/10/2026, 06:48:19 UTC
Views: 99
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