Quick answers
- Is CVE-2026-116863 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-116863 being exploited in the wild.
- How severe is CVE-2026-116863?
- Critical severity, with a CVSS score of 9.6, published 27 October 2026.
- Which products and versions are affected?
- Tribulant Software Newsletters through 4.18.2.
- Is there a fix for CVE-2026-116863?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-116863 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-116863?
- Check whether you run Tribulant Software Newsletters at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a CSRF flaw in the Newsletters plugin through version 4.18.2 that lacks proper anti-CSRF token validation on sensitive actions. An unauthenticated attacker can craft a malicious page that, when visited by a logged-in administrator or user, triggers unwanted administrative actions without explicit consent. Successful exploitation requires user interaction (clicking a link or visiting a crafted page).
Affected products
- Tribulant Software Newsletters through 4.18.2
Timeline
- 2026-08-21: disclosed: Reported by wackydawg
- 2026-10-27: advisory