CVE-2023-1549: The Ad Inserter WordPress plugin before 2.7.27 unserializes user input provided via the settings, which could

Q: How do I fix CVE-2023-1549?

ad inserter: upgrade to 2.7.27. Exact commands for each OS are on this page.

Q: Is CVE-2023-1549 being exploited?

CVE-2023-1549 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-2023-1549 affect?

CVE-2023-1549 affects ad inserter. Severity is high (CVSS 7.2). The Ad Inserter WordPress plugin before 2.7.27 unserializes user input provided via the settings, which could allow high privilege users such as admin to perform PHP Object Injection when a suitable gadget is present

Q: How urgent is CVE-2023-1549?

Priority 54/100. High severity; EPSS top 3%: very likely to be exploited; Public exploit reference

This week

HIGH 7.2UPGRADE

CVE-2023-1549 is a high-severity flaw (CVSS 7.2) affecting ad inserter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Ad Inserter WordPress plugin before 2.7.27 unserializes user input provided via the settings, which could allow high privilege users such as admin to perform PHP Object Injection when a suitable gadget is present

Why this priority

High severity
EPSS top 3%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	16.9% (top 3%)
CISA exploited list	No
Published	2023-05-15
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: ad inserter project

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

Am I affected?

Timeline

2023-05-15 13:15 UTCPublished CVE record published
2026-06-17 05:28 UTCUpdated Record last modified

ad inserter project ad inserter UPGRADE

Affected: < 2.7.27

Fixed in: 2.7.27

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ad-inserter || rpm -q ad-inserter || ad-inserter --version

2. UPGRADE to 2.7.27 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ad-inserter

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ad-inserter

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-2023-1549?

ad inserter: upgrade to 2.7.27. Exact commands for each OS are on this page.

Is CVE-2023-1549 being exploited?

CVE-2023-1549 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-2023-1549 affect?

CVE-2023-1549 affects ad inserter. Severity is high (CVSS 7.2). The Ad Inserter WordPress plugin before 2.7.27 unserializes user input provided via the settings, which could allow high privilege users such as admin to perform PHP Object Injection when a suitable gadget is present

How urgent is CVE-2023-1549?

Priority 54/100. High severity; EPSS top 3%: very likely to be exploited; Public exploit reference

Software pages

WordPress vulnerabilities · PHP vulnerabilities

Related CVEs

CVE-2023-4668 MEDIUM 5.3 UPGRADE The Ad Inserter for WordPress is vulnerable to Sensitive Information Exposure in versions up to, and including
CVE-2023-4645 MEDIUM 5.3 UPGRADE The Ad Inserter for WordPress is vulnerable to Sensitive Information Exposure in versions up to, and including
CVE-2022-0901 MEDIUM 6.1 UPGRADE The Ad Inserter Free and Pro WordPress plugins before 2.7.12 do not sanitise and escape the REQUEST_URI before
CVE-2022-0288 MEDIUM 6.1 UPGRADE UPGRADE The Ad Inserter WordPress plugin before 2.7.10, Ad Inserter Pro WordPress plugin before 2.7.10 do not sanitise

References

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