CVE-2021-3340: A cross-site scripting (XSS) vulnerability in many forms of Wikindx before 5.7.0 and 6.x through 6.4.0 allows

Routine

MEDIUM 6.1UPGRADE

CVE-2021-3340 is a medium-severity flaw (CVSS 6.1) affecting wikindx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross-site scripting (XSS) vulnerability in many forms of Wikindx before 5.7.0 and 6.x through 6.4.0 allows remote attackers to inject arbitrary web script or HTML via the message parameter to index.php?action=initLogon or modules/admin/DELETEIMAGES.php.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-02-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: wikindx project

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

Am I affected?

Timeline

2021-02-01 22:15 UTCPublished CVE record published
2026-06-17 04:04 UTCUpdated Record last modified

wikindx project wikindx UPGRADE

Affected: < 5.7.0 · >= 6.0.0 and <= 6.4.0

Fixed in: 5.7.0

Safe to downgrade to: a release before 6.0.0

1. Check installed version

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

2. UPGRADE to 5.7.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wikindx

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 6.0.0 (Debian / Ubuntu)

apt-cache madison wikindx sudo apt install wikindx=<VERSION_BEFORE_6.0.0> sudo apt-mark hold wikindx

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

dnf --showduplicates list wikindx sudo dnf downgrade wikindx-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add wikindx

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-2021-3340?

wikindx: upgrade to 5.7.0. Exact commands for each OS are on this page.

Is CVE-2021-3340 being exploited?

CVE-2021-3340 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-2021-3340 affect?

CVE-2021-3340 affects wikindx. Severity is medium (CVSS 6.1). A cross-site scripting (XSS) vulnerability in many forms of Wikindx before 5.7.0 and 6.x through 6.4.0 allows remote attackers to inject arbitrary web script or HTML via the message parameter to index.php?action=initLogon or modules/admin/D

How urgent is CVE-2021-3340?

Priority 36/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2019-9961 MEDIUM 6.1 UPGRADE A cross-site scripting (XSS) vulnerability in ressource view in core/modules/resource/RESOURCEVIEW.php in Wiki
CVE-2019-13588 MEDIUM 6.1 UPGRADE A cross-site scripting (XSS) vulnerability in getPagingStart() in core/lists/PAGING.php in WIKINDX before 5.8.
CVE-2019-12930 MEDIUM 6.1 UPGRADE A cross-site scripting (XSS) vulnerability in noMenu() and noSubMenu() in core/navigation/MENU.php in WIKINDX

References

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