What is CVE-2023-2288?

CVE-2023-2288 is a high-severity vulnerability in Themeisle Otter, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2023-05-30.

How severe is CVE-2023-2288?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2023-2288 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Themeisle Otter

CVE-2023-2288

The Otter WordPress plugin before 2.2.6 does not sanitize some user-controlled file paths before performing file operations on them. This leads to a PHAR deserialization vulnerability on PHP < 8.0 using the phar:// stream wrapper.

Vulnerability class: Insecure Deserialization

Published 2023-05-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.180 (97.1th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.180 · newest: 0.180 · change: 0.000

Affected products

Themeisle Otter
Otter — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

wpscan.com/vulnerability/93acb4ee-1053-48e1-8b69-c09dc3b2f302 (Exploit, technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2023-2288?: CVE-2023-2288 is a high-severity vulnerability in Themeisle Otter, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2023-05-30.
How severe is CVE-2023-2288?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2023-2288 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.