CVE-2026-16639
Description
In a scenario of a multilingual website with different domain names per language, this module enables you to be automatically connected across the language domains if you are logged on the main language domain. The module doesn't sufficiently validate a short-lived token, allowing an attacker to bypass access control and authenticate as a victim user. This vulnerability is mitigated by the fact that an attacker must appear to originate from the same client IP as the victim.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Packagist:https://packages.drupal.org/8 | drupal/i18n_sso | <1.8.0 | 1.8.0 |
References
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.