Quick answers
- Is CVE-2025-15591 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-15591 being exploited in the wild.
- How severe is CVE-2025-15591?
- Informational severity, published 6 October 2026.
- Which products and versions are affected?
- Opentext Content Server <UNKNOWN>.
- Is there a fix for CVE-2025-15591?
- 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-2025-15591 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2025-15591?
- Check whether you run Opentext Content Server 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
A stored or reflected XSS vulnerability exists in the Forums feature of OpenText Content Server, allowing an unauthenticated or authenticated attacker to inject malicious JavaScript into forum pages. The vulnerability arises from insufficient input validation or output encoding in the Forums web interface. Successful exploitation results in arbitrary code execution in the context of affected users' browsers.
Affected products
- OpenText Content Server <UNKNOWN>
Timeline
- 2026-10-06: disclosed