CVE-2020-23719: Cross site scripting (XSS) vulnerability in application/controllers/AdminController.php in xujinliang zibbs 1.

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CRITICAL 9.6DOWNGRADE

CVE-2020-23719 is a critical-severity flaw (CVSS 9.6) affecting zibbs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross site scripting (XSS) vulnerability in application/controllers/AdminController.php in xujinliang zibbs 1.0, allows attackers to execute arbitrary code via the bbsmeta parameter.

Why this priority

Critical severity
Public exploit reference

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

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-11-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: zibbs project

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

Am I affected?

Timeline

2021-11-02 18:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

zibbs project zibbs DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison zibbs sudo apt install zibbs=<VERSION_BEFORE_1.0> sudo apt-mark hold zibbs

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

dnf --showduplicates list zibbs sudo dnf downgrade zibbs-<VERSION_BEFORE_1.0> sudo dnf versionlock add zibbs

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-2020-23719?

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

Is CVE-2020-23719 being exploited?

CVE-2020-23719 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-2020-23719 affect?

CVE-2020-23719 affects zibbs. Severity is critical (CVSS 9.6). Cross site scripting (XSS) vulnerability in application/controllers/AdminController.php in xujinliang zibbs 1.0, allows attackers to execute arbitrary code via the bbsmeta parameter.

How urgent is CVE-2020-23719?

Priority 57/100. Critical severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-23718 CRITICAL 9.6 DOWNGRADE Cross site scripting (XSS) vulnerability in xujinliang zibbs 1.0, allows attackers to execute arbitrary code v

References

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