CVE-2020-18125: A reflected cross-site scripting (XSS) vulnerability in the /plugin/ajax.php component of Indexhibit 2.1.5 all

Routine

MEDIUM 6.1DOWNGRADE

CVE-2020-18125 is a medium-severity flaw (CVSS 6.1) affecting indexhibit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A reflected cross-site scripting (XSS) vulnerability in the /plugin/ajax.php component of Indexhibit 2.1.5 allows attackers to execute arbitrary web scripts or HTML.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-08-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: indexhibit

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

Am I affected?

Timeline

2021-08-30 18:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

indexhibit indexhibit DOWNGRADE

Affected: 2.1.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1.5 (Debian / Ubuntu)

apt-cache madison indexhibit sudo apt install indexhibit=<VERSION_BEFORE_2.1.5> sudo apt-mark hold indexhibit

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

dnf --showduplicates list indexhibit sudo dnf downgrade indexhibit-<VERSION_BEFORE_2.1.5> sudo dnf versionlock add indexhibit

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-2020-18125?

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

Is CVE-2020-18125 being exploited?

CVE-2020-18125 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-2020-18125 affect?

CVE-2020-18125 affects indexhibit. Severity is medium (CVSS 6.1). A reflected cross-site scripting (XSS) vulnerability in the /plugin/ajax.php component of Indexhibit 2.1.5 allows attackers to execute arbitrary web scripts or HTML.

How urgent is CVE-2020-18125?

Priority 38/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-18127 MEDIUM 6.5 DOWNGRADE An issue in the /config/config.php component of Indexhibit 2.1.5 allows attackers to arbitrarily view files.
CVE-2020-18126 MEDIUM 5.4 DOWNGRADE Multiple stored cross-site scripting (XSS) vulnerabilities in the Sections module of Indexhibit 2.1.5 allows a
CVE-2020-18124 MEDIUM 5.7 DOWNGRADE A cross-site request forgery (CSRF) vulnerability in Indexhibit 2.1.5 allows attackers to arbitrarily reset ac
CVE-2020-18123 MEDIUM 6.5 DOWNGRADE A cross-site request forgery (CSRF) vulnerability in Indexhibit 2.1.5 allows attackers to arbitrarily delete a
CVE-2020-18121 HIGH 8.8 DOWNGRADE A configuration issue in Indexhibit 2.1.5 allows authenticated attackers to modify .php files, leading to gets

References

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