CVE-2021-45888: An issue was discovered in PONTON X/P Messenger before 3.11.2

Routine

MEDIUM 4.8DOWNGRADE

CVE-2021-45888 is a medium-severity flaw (CVSS 4.8) affecting x\/p messenger. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in PONTON X/P Messenger before 3.11.2. The navigation tree that is shown on the left side of every page of the web application is vulnerable to XSS: it allows injection of JavaScript into its nodes. Creating such nodes is only possible for users who have the role Configuration Administrator or Administrator.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-03-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ponton

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

Am I affected?

Timeline

2022-03-13 02:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

ponton x\/p messenger DOWNGRADE

Affected: 3.8.0 · 3.10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.8.0

1. Check installed version

apt-cache policy xp-messenger || rpm -q xp-messenger || xp-messenger --version

2. No fixed release: DOWNGRADE to a release before 3.8.0 (Debian / Ubuntu)

apt-cache madison xp-messenger sudo apt install xp-messenger=<VERSION_BEFORE_3.8.0> sudo apt-mark hold xp-messenger

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

dnf --showduplicates list xp-messenger sudo dnf downgrade xp-messenger-<VERSION_BEFORE_3.8.0> sudo dnf versionlock add xp-messenger

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-2021-45888?

x\/p messenger: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-45888 being exploited?

CVE-2021-45888 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-2021-45888 affect?

CVE-2021-45888 affects x\/p messenger. Severity is medium (CVSS 4.8). An issue was discovered in PONTON X/P Messenger before 3.11.2. The navigation tree that is shown on the left side of every page of the web application is vulnerable to XSS: it allows injection of JavaScript into its nodes. Creating such nod

How urgent is CVE-2021-45888?

Priority 34/100. Public exploit reference

Related CVEs

CVE-2021-45889 MEDIUM 5.4 DOWNGRADE An issue was discovered in PONTON X/P Messenger before 3.11.2
CVE-2021-45887 CRITICAL 9.8 DOWNGRADE An issue was discovered in PONTON X/P Messenger before 3.11.2
CVE-2021-45886 HIGH 8.8 DOWNGRADE An issue was discovered in PONTON X/P Messenger before 3.11.2

References

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