How severe is CVE-2026-2861?

CVE-2026-2861 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-2861 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2861?

CVE-2026-2861 affects Foswiki. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2861?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-2861 have an EU (EUVD) identifier?

Yes. CVE-2026-2861 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7530.

When was CVE-2026-2861 published?

CVE-2026-2861 was published on 2026-02-21 and last updated on 2026-06-17.

CVE-2026-2861

CVE-2026-2861 is a medium-severity vulnerability in Foswiki with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
CVSS v4: 5.5
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7530
Weakness: CWE-200
Affected product: Foswiki
Published: 2026-02-21
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-2861?: 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.
How severe is CVE-2026-2861?: CVE-2026-2861 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-2861 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2861?: CVE-2026-2861 affects Foswiki. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2861?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-2861 have an EU (EUVD) identifier?: Yes. CVE-2026-2861 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7530.
When was CVE-2026-2861 published?: CVE-2026-2861 was published on 2026-02-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:foswiki:foswiki:*:*:*:*:*:*:*:*

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