Quick answers
- Is CVE-2026-16296 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-16296 being exploited in the wild.
- How severe is CVE-2026-16296?
- Medium severity, with a CVSS score of 4.7, published 4 August 2026.
- Which products and versions are affected?
- Clearfy Cache before 2.4.3.
- Is there a fix for CVE-2026-16296?
- A patch was published on 2026-07-27: Fixed in version 2.4.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-16296 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-16296?
- Check whether you run Clearfy Cache 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 an open redirect (CWE-601) in the Cyrlitera old-URL redirect handler that fails to validate redirect targets before passing them to an unsafe redirect function. An unauthenticated attacker can craft a malicious URL containing a double-encoded protocol-relative URL (e.g., %252F//evil.com) or single-encoded paths that exploit the transliteration logic to bypass the plugin's current_url != new_url guard. The vulnerability requires two non-default preconditions: pretty permalinks enabled and the "Redirection old URLs to new ones" option activated in Settings > Clearfy > SEO > Transliteration. Exploitation results in HTTP 301/302 redirects to arbitrary external URLs, potentially used for credential theft, phishing, or malware delivery. The vulnerability is fixed in version 2.4.3.
Affected products
- Clearfy Clearfy Cache before 2.4.3
Timeline
- 2026-07-27: disclosed
- 2026-07-27: patched: Fixed in version 2.4.3
- 2026-08-04: advisory