CVE-2026-2861 Foswiki Changes/Viewfile/Oops information disclosure

Medium 6.9 Published 21 Feb 2026 Updated 16 Mar 2026

Remote attackers can exploit a flaw in Foswiki's Changes/Viewfile/Oops components to disclose sensitive information.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-2861?

CVE-2026-2861 is a medium-severity vulnerability in Foswiki, published on 21 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability was detected in Foswiki up to 2.1.10. The affected element is an unknown function of the component Changes/Viewfile/Oops. The manipulation results in information disclosure. It is possible to launch the attack remotely. The exploit is now public and may be used. Upgrading to version 2.1.11 is sufficient to fix this issue. The patch is identified as 31aeecb58b64/d8ed86b10e46. Upgrading the affected component is recommended.

Weakness: CWE-284, CWE-200

Which versions are affected by CVE-2026-2861?

It affects 1 product.

Products include Foswiki Foswiki.

How do I fix CVE-2026-2861?

No fix has been published for CVE-2026-2861 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-2861 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2861 exists.

Sources

Also known as GHSA-7fj8-2w2v-gvp9.