Otter — Gutenberg Blocks <= 2.2.5 - Authenticated (Author+) PHAR Deserialization
CVE-2023-2288Published · Updated Action summary
Affected: ≤2.2.5Update to 2.2.6 or newer
All remediation steps- Severity
- High8.8
- CVSS
- 8.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-502 PHP Object Injection
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE otter-blocks
- Affected≤ 2.2.5
- Patched in2.2.6
Update to 2.2.6 or newer.
You are affected if you run ≤ 2.2.5. Version 2.2.6 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 2.2.6, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Alex Sanford.
The Otter - Gutenberg Blocks plugin for WordPress is vulnerable to deserialization of untrusted input via the 'fallback' parameter in versions up to, and including 1.2.7. This makes it possible for authenticated attackers with author privileges to call files using a PHAR wrapper that will deserialize and call arbitrary PHP Objects that can be used to perform a variety of malicious actions granted a POP chain is also present. It also requires that the attacker is successful in uploading a file with the serialized payload.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE
All 20| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting <3.2.8Update to 3.2.8 | CVE-2026-109933 | |
| Medium5.3 | Missing Authorization <3.2.8Update to 3.2.8 | CVE-2026-109935 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting <3.2.8Update to 3.2.8 | CVE-2026-109936 | |
| Medium5.3 | 3.2.7 - Missing Authorization 3.1.1 – 3.2.7Update to 3.2.8 | CVE-2026-109934 | |
| Medium4.7 | Unauthenticated Open Redirect ≤3.2.2Update to 3.2.3 | CVE-2026-109937 |
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
<3.2.8Update to 3.2.8
- Medium5.3Missing Authorization
<3.2.8Update to 3.2.8
- High7.2Unauthenticated Stored Cross-Site Scripting
<3.2.8Update to 3.2.8
- Medium5.33.2.7 - Missing Authorization
3.1.1 – 3.2.7Update to 3.2.8
- Medium4.7Unauthenticated Open Redirect
≤3.2.2Update to 3.2.3
Same weakness (PHP Object Injection)
All PHP Object Injection| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity high, CVSS 8.8
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.