Quick answers
- Is CVE-2026-103426 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103426 being exploited in the wild.
- How severe is CVE-2026-103426?
- High severity, with a CVSS score of 7.2, published 2 October 2026.
- Which products and versions are affected?
- Relevanssi Premium up to and including 2.31.4.
- Is there a fix for CVE-2026-103426?
- No fixed version is recorded yet. Disable the click-tracking and logging feature in the Relevanssi Premium plugin settings until a patched version is available. 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-2026-103426 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-103426?
- Check whether you run Relevanssi Premium 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
Disable the click-tracking and logging feature in the Relevanssi Premium plugin settings until a patched version is available.
Technical details
This is a stored cross-site scripting (XSS) vulnerability in the Relevanssi Premium plugin's click-tracking and logging feature, where the _rt parameter is not properly sanitized on input or escaped on output. The vulnerability is trivially exploitable because the nonce (_rt_nonce) is publicly emitted on all search results pages, allowing unauthenticated attackers to forge valid requests. Once injected, the malicious script persists in the plugin's logs and executes in the context of every user's browser that accesses an affected page.
Affected products
- Relevanssi Relevanssi Premium up to and including 2.31.4
Timeline
- 2026-10-02: disclosed