CVE-2026-28556: wpForo Forum 2.4.14 contains a missing authorization vulnerability that allows authenticated subscribers to mo

Routine

MEDIUM 5.4UPGRADE

CVE-2026-28556 is a medium-severity flaw (CVSS 5.4) 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 a missing authorization vulnerability that allows authenticated subscribers to move, merge, or split any forum topic via the topic_move, topic_merge, and topic_split form action handlers. Attackers with a valid form nonce can reorganize arbitrary forum content without moderator permissions, including relocating topics to private forums.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-862
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-2026-28556?

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

Is CVE-2026-28556 being exploited?

CVE-2026-28556 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-2026-28556 affect?

CVE-2026-28556 affects wpforo forum. Severity is medium (CVSS 5.4). wpForo Forum 2.4.14 contains a missing authorization vulnerability that allows authenticated subscribers to move, merge, or split any forum topic via the topic_move, topic_merge, and topic_split form action handlers. Attackers with a valid

How urgent is CVE-2026-28556?

Priority 23/100. No elevated risk signals yet.

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-2026-28559 MEDIUM 5.3 UPGRADE wpForo Forum 2.4.14 contains an information disclosure vulnerability that allows unauthenticated users to retr
CVE-2026-28558 MEDIUM 6.4 UPGRADE wpForo Forum 2.4.14 contains a stored cross-site scripting vulnerability that allows authenticated subscribers

References

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