CVE-2019-15320: The option-tree plugin before 2.7.3 for WordPress has Object Injection because the + character is mishandled.

Q: How do I fix CVE-2019-15320?

optiontree: upgrade to 2.7.3. Exact commands for each OS are on this page.

Q: Is CVE-2019-15320 being exploited?

CVE-2019-15320 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-2019-15320 affect?

CVE-2019-15320 affects optiontree. Severity is critical (CVSS 9.8). The option-tree plugin before 2.7.3 for WordPress has Object Injection because the + character is mishandled.

Q: How urgent is CVE-2019-15320?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-15320 is a critical-severity flaw (CVSS 9.8) affecting optiontree. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The option-tree plugin before 2.7.3 for WordPress has Object Injection because the + character is mishandled.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-502
Published	2019-08-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: optiontree project

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

Am I affected?

Timeline

2019-08-22 14:15 UTCPublished CVE record published
2026-06-17 02:20 UTCUpdated Record last modified

optiontree project optiontree UPGRADE

Affected: < 2.7.3

Fixed in: 2.7.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.7.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade optiontree

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-2019-15320?

optiontree: upgrade to 2.7.3. Exact commands for each OS are on this page.

Is CVE-2019-15320 being exploited?

CVE-2019-15320 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-2019-15320 affect?

CVE-2019-15320 affects optiontree. Severity is critical (CVSS 9.8). The option-tree plugin before 2.7.3 for WordPress has Object Injection because the + character is mishandled.

How urgent is CVE-2019-15320?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2019-15321 CRITICAL 9.8 UPGRADE The option-tree plugin before 2.7.3 for WordPress has Object Injection because serialized classes are mishandl
CVE-2019-15319 CRITICAL 9.8 UPGRADE The option-tree plugin before 2.7.0 for WordPress has Object Injection by leveraging a valid nonce.
CVE-2016-10895 MEDIUM 6.1 UPGRADE The option-tree plugin before 2.6.0 for WordPress has XSS via an add_list_item or add_social_links AJAX reques
CVE-2015-9320 MEDIUM 6.1 UPGRADE The option-tree plugin before 2.5.4 for WordPress has XSS related to add_query_arg.

References

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