CVE-2026-88903CWE-79cross-site-scripting

CVE-2026-88903

High · published October 11, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
19.0
In the wild
Unconfirmed
What it is

The Topcontent WordPress plugin through 1.2.1 does not properly authorise one of its request handlers and disables HTML sanitisation before storing the submitted content, allowing unauthenticated attackers to publish arbitrary posts containing malicious JavaScript on any site where its API key has never been configured.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00276 · 19.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-11T11:17Z
References (1)
https://wpscan.com/vulnerability/173b07dd-6404-49c0-9e01-90b5b68d1dec/ · [email protected]
EPSS history
Timeline
  • 12 OCT 03:31Z
    EPSS moved — → 0%
    epss
  • 11 OCT 06:00Z
    Topcontent <= 1.2.1 - Unauthenticated Stored XSS via Content Webhook
    cvelistv5
  • 11 OCT 06:00Z
    Topcontent <= 1.2.1 - Unauthenticated Stored XSS via Content Webhook
    cvelistv5