Quick answers
- Is CVE-2026-55840 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-55840 being exploited in the wild.
- How severe is CVE-2026-55840?
- Medium severity, with a CVSS score of 5.4, published 15 October 2026.
- Which products and versions are affected?
- Erudika Scoold before 1.69.1.
- Is there a fix for CVE-2026-55840?
- Yes: fixed in 1.69.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-55840 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-55840?
- Check whether you run Erudika Scoold 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.
How to fix
- Fixed in: 1.69.1
Technical details
The getBackToUrl() method in HttpUtils.java performs insufficient URL validation using a simple prefix check against the configured server hostname. An attacker can supply an absolute URL whose hostname begins with the legitimate hostname (e.g., "legit.comattacker.com") to bypass the check, as URI.resolve() retains the attacker-controlled URL. This allows post-authentication redirects to arbitrary attacker-controlled domains, enabling phishing and token theft.
Affected products
- Erudika Scoold before 1.69.1
Timeline
- 2026-10-15: disclosed