CVE-2026-4420: Bludit is vulnerable to Stored Cross-Site Scripting (XSS) in its page creating functionality

Routine

MEDIUM 5.4DOWNGRADE

CVE-2026-4420 is a medium-severity flaw (CVSS 5.4) affecting bludit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Bludit is vulnerable to Stored Cross-Site Scripting (XSS) in its page creating functionality. An authenticated attacker with page creation privileges (such as Author, Editor, or Administrator) can embed a malicious JavaScript payload in the tags field of a newly created article. This payload will be executed when a victim visits the URL of the uploaded resource. The uploaded resource itself is accessible without authentication. Critically, this v

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-07
Last modified	2026-06-17

Publisher (CNA): CERT.PL · Vendor: bludit

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

Am I affected?

Timeline

2026-04-07 11:16 UTCPublished CVE record published
2026-06-17 10:56 UTCUpdated Record last modified

bludit bludit DOWNGRADE

Affected: 3.17.2 · 3.18.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.17.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.17.2 (Debian / Ubuntu)

apt-cache madison bludit sudo apt install bludit=<VERSION_BEFORE_3.17.2> sudo apt-mark hold bludit

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list bludit sudo dnf downgrade bludit-<VERSION_BEFORE_3.17.2> sudo dnf versionlock add bludit

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-2026-4420?

bludit: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-4420 being exploited?

CVE-2026-4420 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-2026-4420 affect?

CVE-2026-4420 affects bludit. Severity is medium (CVSS 5.4). Bludit is vulnerable to Stored Cross-Site Scripting (XSS) in its page creating functionality. An authenticated attacker with page creation privileges (such as Author, Editor, or Administrator) can embed a malicious JavaScript payload in the

How urgent is CVE-2026-4420?

Priority 20/100. No elevated risk signals yet.

References

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