CVE-2020-24771: Incorrect access control in NexusPHP 1.5.beta5.20120707 allows unauthorized attackers to access published cont

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2020-24771 is a high-severity flaw (CVSS 7.5) affecting nexusphp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Incorrect access control in NexusPHP 1.5.beta5.20120707 allows unauthorized attackers to access published content.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-863
Published	2022-03-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nexusphp

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

Am I affected?

Timeline

2022-03-30 02:15 UTCPublished CVE record published
2026-06-17 03:06 UTCUpdated Record last modified

nexusphp nexusphp DOWNGRADE

Affected: 1.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.5 (Debian / Ubuntu)

apt-cache madison nexusphp sudo apt install nexusphp=<VERSION_BEFORE_1.5> sudo apt-mark hold nexusphp

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

dnf --showduplicates list nexusphp sudo dnf downgrade nexusphp-<VERSION_BEFORE_1.5> sudo dnf versionlock add nexusphp

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-2020-24771?

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

Is CVE-2020-24771 being exploited?

CVE-2020-24771 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-2020-24771 affect?

CVE-2020-24771 affects nexusphp. Severity is high (CVSS 7.5). Incorrect access control in NexusPHP 1.5.beta5.20120707 allows unauthorized attackers to access published content.

How urgent is CVE-2020-24771?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-46890 MEDIUM 4.3 UPGRADE Weak access control in NexusPHP before 1.7.33 allows a remote authenticated user to edit any post in the forum
CVE-2022-46889 MEDIUM 5.4 UPGRADE A persistent cross-site scripting (XSS) vulnerability in NexusPHP before 1.7.33 allows remote authenticated at
CVE-2022-46888 MEDIUM 6.1 UPGRADE Multiple reflective cross-site scripting (XSS) vulnerabilities in NexusPHP before 1.7.33 allow remote attacker
CVE-2022-46887 CRITICAL 9.8 UPGRADE Multiple SQL injection vulnerabilities in NexusPHP before 1.7.33 allow remote attackers to execute arbitrary S
CVE-2020-24770 CRITICAL 9.8 DOWNGRADE SQL injection vulnerability in modrules.php in NexusPHP 1.5 allows remote attackers to execute arbitrary SQL c

References

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