CVE-2021-24881: The Passster WordPress plugin before 3.5.5.9 does not properly check for password, as well as that the post to

Q: How do I fix CVE-2021-24881?

passter: upgrade to 3.5.5.9. Exact commands for each OS are on this page.

Q: Is CVE-2021-24881 being exploited?

CVE-2021-24881 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-24881 affect?

CVE-2021-24881 affects passter. Severity is high (CVSS 7.5). The Passster WordPress plugin before 3.5.5.9 does not properly check for password, as well as that the post to be viewed is public, allowing unauthenticated users to bypass the protection offered by the plugin, and access arbitrary posts (s

Q: How urgent is CVE-2021-24881?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2021-24881 is a high-severity flaw (CVSS 7.5) affecting passter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Passster WordPress plugin before 3.5.5.9 does not properly check for password, as well as that the post to be viewed is public, allowing unauthenticated users to bypass the protection offered by the plugin, and access arbitrary posts (such as private) content, by sending a specifically crafted request.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Published	2023-01-23
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: passster project

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

Am I affected?

Timeline

2023-01-23 15:15 UTCPublished CVE record published
2026-06-17 03:41 UTCUpdated Record last modified

passster project passter UPGRADE

Affected: < 3.5.5.9

Fixed in: 3.5.5.9

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.5.5.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade passter

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade passter

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2021-24881?

passter: upgrade to 3.5.5.9. Exact commands for each OS are on this page.

Is CVE-2021-24881 being exploited?

CVE-2021-24881 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-2021-24881 affect?

CVE-2021-24881 affects passter. Severity is high (CVSS 7.5). The Passster WordPress plugin before 3.5.5.9 does not properly check for password, as well as that the post to be viewed is public, allowing unauthenticated users to bypass the protection offered by the plugin, and access arbitrary posts (s

How urgent is CVE-2021-24881?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2021-24837 MEDIUM 5.4 UPGRADE The Passster WordPress plugin before 3.5.5.8 does not escape the area parameter of its shortcode, which could

References

← Back to latest CVEs