CVE-2026-21626: Access control settings for forum post custom fields are not applied to the JSON output type, leading to an AC

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-21626 is a high-severity flaw (CVSS 7.5) affecting easydiscuss. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Access control settings for forum post custom fields are not applied to the JSON output type, leading to an ACL violation vector an information disclosure

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-02-06
Last modified	2026-06-17

Publisher (CNA): Joomla! Project · Vendor: stackideas

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

Am I affected?

Timeline

2026-02-06 08:15 UTCPublished CVE record published
2026-06-17 10:18 UTCUpdated Record last modified

stackideas easydiscuss UPGRADE

Affected: >= 1.0.0 and <= 5.0.15

Fixed in: newer than 5.0.15

Safe to downgrade to: a release before 1.0.0

1. Check installed version

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

2. UPGRADE to newer than 5.0.15 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade easydiscuss

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 1.0.0 (Debian / Ubuntu)

apt-cache madison easydiscuss sudo apt install easydiscuss=<VERSION_BEFORE_1.0.0> sudo apt-mark hold easydiscuss

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

dnf --showduplicates list easydiscuss sudo dnf downgrade easydiscuss-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add easydiscuss

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-2026-21626?

easydiscuss: upgrade to newer than 5.0.15. Exact commands for each OS are on this page.

Is CVE-2026-21626 being exploited?

CVE-2026-21626 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-2026-21626 affect?

CVE-2026-21626 affects easydiscuss. Severity is high (CVSS 7.5). Access control settings for forum post custom fields are not applied to the JSON output type, leading to an ACL violation vector an information disclosure

How urgent is CVE-2026-21626?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-21625 HIGH 8.8 UPGRADE User provided uploads to the Easy Discuss component for Joomla aren't properly validated
CVE-2026-21624 MEDIUM 5.4 UPGRADE Lack of input filterung leads to a persistent XSS vulnerability in the user avatar text handling of the Easy D
CVE-2026-21623 MEDIUM 5.4 UPGRADE Lack of input filterung leads to a persistent XSS vulnerability in the forum post handling of the Easy Discuss

References

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