CVE-2026-28559: wpForo Forum 2.4.14 contains an information disclosure vulnerability that allows unauthenticated users to retr

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-28559 is a medium-severity flaw (CVSS 5.3) affecting wpforo forum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

wpForo Forum 2.4.14 contains an information disclosure vulnerability that allows unauthenticated users to retrieve private and unapproved forum topics via the global RSS feed endpoint. Attackers request the RSS feed without a forum ID parameter, bypassing the privacy and status WHERE clauses that are only applied when a specific forum ID is present in the query.

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	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-02-28
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: gvectors

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

Am I affected?

Timeline

2026-02-28 22:16 UTCPublished CVE record published
2026-06-17 10:28 UTCUpdated Record last modified

gvectors wpforo forum UPGRADE

Affected: >= 2.4.0 and < 2.4.16

Fixed in: 2.4.16

Safe to downgrade to: a release before 2.4.0

1. Check installed version

apt-cache policy wpforo-forum || rpm -q wpforo-forum || wpforo-forum --version

2. UPGRADE to 2.4.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wpforo-forum

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wpforo-forum

Note

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

3. If no update is available yet, DOWNGRADE to a release before 2.4.0 (Debian / Ubuntu)

apt-cache madison wpforo-forum sudo apt install wpforo-forum=<VERSION_BEFORE_2.4.0> sudo apt-mark hold wpforo-forum

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list wpforo-forum sudo dnf downgrade wpforo-forum-<VERSION_BEFORE_2.4.0> sudo dnf versionlock add wpforo-forum

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-28559?

wpforo forum: upgrade to 2.4.16. Exact commands for each OS are on this page.

Is CVE-2026-28559 being exploited?

CVE-2026-28559 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-2026-28559 affect?

CVE-2026-28559 affects wpforo forum. Severity is medium (CVSS 5.3). wpForo Forum 2.4.14 contains an information disclosure vulnerability that allows unauthenticated users to retrieve private and unapproved forum topics via the global RSS feed endpoint. Attackers request the RSS feed without a forum ID param

How urgent is CVE-2026-28559?

Priority 32/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-28562 HIGH 8.2 UPGRADE wpForo 2.4.14 contains an unauthenticated SQL injection vulnerability in Topics::get_topics() where the ORDER
CVE-2026-28561 MEDIUM 5.5 UPGRADE wpForo Forum 2.4.14 contains a stored cross-site scripting vulnerability that allows administrators to inject
CVE-2026-28560 MEDIUM 5.5 UPGRADE wpForo Forum 2.4.14 contains a stored cross-site scripting vulnerability that allows script injection via foru
CVE-2026-28558 MEDIUM 6.4 UPGRADE wpForo Forum 2.4.14 contains a stored cross-site scripting vulnerability that allows authenticated subscribers
CVE-2026-28557 MEDIUM 6.5 UPGRADE wpForo Forum 2.4.14 contains a missing capability check vulnerability that allows authenticated users to trigg

References

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