CVE-2026-2861: A vulnerability was detected in Foswiki up to 2.1.10

Q: How do I fix CVE-2026-2861?

foswiki: upgrade to 2.1.11. Exact commands for each OS are on this page.

Q: Is CVE-2026-2861 being exploited?

CVE-2026-2861 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-2861 affect?

CVE-2026-2861 affects foswiki. Severity is medium (CVSS 5.3). 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

Q: How urgent is CVE-2026-2861?

Priority 35/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-2861 is a medium-severity flaw (CVSS 5.3) affecting foswiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-200, CWE-284
Published	2026-02-21
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: foswiki

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-21 06:17 UTCPublished CVE record published
2026-06-17 10:31 UTCUpdated Record last modified

foswiki foswiki UPGRADE

Affected: < 2.1.11

Fixed in: 2.1.11

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy foswiki || rpm -q foswiki || foswiki --version

2. UPGRADE to 2.1.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade foswiki

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade foswiki

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-2861?

foswiki: upgrade to 2.1.11. Exact commands for each OS are on this page.

Is CVE-2026-2861 being exploited?

CVE-2026-2861 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-2861 affect?

CVE-2026-2861 affects foswiki. Severity is medium (CVSS 5.3). 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

How urgent is CVE-2026-2861?

Priority 35/100. Remotely exploitable, no login, no user action

References

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