Zero Radar
← feed
CriticalVulnerabilityCVE-2026-112859updated 25 Oct 2026, 17:20 UTC

Little Birdies WordPress theme: untrusted data can run attacker code

A flaw in the Little Birdies theme lets an attacker send specially crafted data that the website trusts and processes unsafely. In the worst case, this can let someone take control of the site.

Official, 2 sources
SeverityCriticalCVSS 9.8 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

How the attack works simplified

  1. 1Attacker sends crafted dataMalicious serialized input sent to the site
  2. 2Theme processes inputTheme unserializes untrusted data without checks
  3. 3Malicious object injectedAttacker-controlled object gets created
  4. 4Code runs on serverInjected object triggers harmful actions
  5. ResultAttacker may take control of the site

What happened

The Little Birdies theme by ThemeREX Group has an insecure deserialization flaw (object injection) that allows attackers to inject malicious objects. The advisory rates it critical with a CVSS score of 9.8.

Why it is dangerous: A successful attack could lead to full compromise of the affected website, including data theft or malicious changes. Anyone running the vulnerable theme on a public site is at risk.

Are you affected?

You are affected if you run the Little Birdies theme version 1.3.16 or earlier.

Little Birdies (ThemeREX Group): all versions through 1.3.16

What to do

  1. Check whether your site uses the Little Birdies theme and what version is installed
  2. Update to a version newer than 1.3.16 as soon as the vendor releases one
  3. If no fix is available yet, switch to a different theme or restrict access to the site until a fix is released

Timeline

  1. 23 Oct 2026, 13:17 UTC
    Publicly disclosed
  2. 23 Oct 2026, 13:17 UTC
    Reported by NVD · NVD
  3. 25 Oct 2026, 17:20 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-112859 · GHSA-8xhm-xwwm-cmm8
CVSS
9.8 / 10
EPSS
0.3% chance of exploitation within 30 days
Disclosed
23 Oct 2026, 13:17 UTC
On Zero Radar
before the radar started
Last change
25 Oct 2026, 17:20 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Little Birdies WordPress theme: untrusted data can run attacker code · Zero Radar